| 1 |  |  | <?php | 
            
                                                                                                            
                            
            
                                    
            
            
                | 2 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 3 |  |  | namespace Ajax\semantic\html\collections\menus; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 4 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 5 |  |  | use Ajax\common\html\HtmlDoubleElement; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 6 |  |  | use Ajax\semantic\html\base\constants\Direction; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 7 |  |  | use Ajax\semantic\html\base\HtmlSemCollection; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 8 |  |  | use Ajax\semantic\html\base\HtmlSemDoubleElement; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 9 |  |  | use Ajax\semantic\html\base\constants\Wide; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 10 |  |  | use Ajax\common\html\html5\HtmlImg; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 11 |  |  | use Ajax\semantic\html\modules\HtmlDropdown; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 12 |  |  | use Ajax\common\html\BaseHtml; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 13 |  |  | use Ajax\semantic\html\modules\HtmlPopup; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 14 |  |  | use Ajax\semantic\html\elements\HtmlIcon; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 15 |  |  | use Ajax\semantic\html\elements\html5\HtmlLink; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 16 |  |  | use Ajax\semantic\html\elements\HtmlInput; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 17 |  |  | use Ajax\semantic\html\elements\HtmlButton; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 18 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 19 |  |  | /** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 20 |  |  |  * Semantic Menu component | 
            
                                                                                                            
                            
            
                                    
            
            
                | 21 |  |  |  * @see http://semantic-ui.com/collections/menu.html | 
            
                                                                                                            
                            
            
                                    
            
            
                | 22 |  |  |  * @author jc | 
            
                                                                                                            
                            
            
                                    
            
            
                | 23 |  |  |  * @version 1.001 | 
            
                                                                                                            
                            
            
                                    
            
            
                | 24 |  |  |  */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 25 |  |  | class HtmlMenu extends HtmlSemCollection { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 26 |  |  | 	private $_itemHeader; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 27 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 28 |  |  | 	public function __construct($identifier, $items=array()) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 29 |  |  | 		parent::__construct($identifier, "div", "ui menu"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 30 |  |  | 		$this->addItems($items); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 31 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 32 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 33 |  |  | 	/** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 34 |  |  | 	 * Sets the menu type | 
            
                                                                                                            
                            
            
                                    
            
            
                | 35 |  |  | 	 * @param string $type one of text,item | 
            
                                                                                                            
                            
            
                                    
            
            
                | 36 |  |  | 	 * @return \Ajax\semantic\html\collections\HtmlMenu | 
            
                                                                                                            
                            
            
                                    
            
            
                | 37 |  |  | 	 */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 38 |  |  | 	public function setType($type="") { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 39 |  |  | 		return $this->addToPropertyCtrl("class", $type, array ("","item","text" )); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 40 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 41 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 42 |  |  | 	public function setActiveItem($index) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 43 |  |  | 		$item=$this->getItem($index); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 44 |  |  | 		if ($item !== null) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 45 |  |  | 			$item->addToProperty("class", "active"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 46 |  |  | 		} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 47 |  |  | 		return $this; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 48 |  |  | 	} | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 49 |  |  |  | 
            
                                                                        
                            
            
                                    
            
            
                | 50 |  |  | 	private function getItemToInsert($item) { | 
            
                                                                        
                            
            
                                    
            
            
                | 51 |  |  | 		if ($item instanceof HtmlInput || $item instanceof HtmlImg || $item instanceof HtmlIcon || $item instanceof HtmlButton || ($item instanceof HtmlDropdown && $this->propertyContains("class", "vertical")===false)) { | 
            
                                                                        
                            
            
                                    
            
            
                | 52 |  |  | 			$itemO=new HtmlSemDoubleElement("item-" . $this->identifier, "div", ""); | 
            
                                                                        
                            
            
                                    
            
            
                | 53 |  |  | 			$itemO->setContent($item); | 
            
                                                                        
                            
            
                                    
            
            
                | 54 |  |  | 			$item=$itemO; | 
            
                                                                        
                            
            
                                    
            
            
                | 55 |  |  | 		} | 
            
                                                                        
                            
            
                                    
            
            
                | 56 |  |  | 		return $item; | 
            
                                                                        
                            
            
                                    
            
            
                | 57 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 58 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 59 |  |  | 	private function afterInsert($item) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 60 |  |  | 		if (!$item instanceof HtmlMenu) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 61 |  |  | 			$item->addToPropertyCtrl("class", "item", array ("item" )); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 62 |  |  | 		else { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 63 |  |  | 			$this->setSecondary(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 64 |  |  | 		} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 65 |  |  | 		return $item; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 66 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 67 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 68 |  |  | 	/** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 69 |  |  | 	 * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 70 |  |  | 	 * {@inheritDoc} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 71 |  |  | 	 * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 72 |  |  | 	 * @see \Ajax\common\html\html5\HtmlCollection::addItem() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 73 |  |  | 	 */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 74 |  |  | 	public function addItem($item) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 75 |  |  | 		$item=parent::addItem($this->getItemToInsert($item)); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 76 |  |  | 		return $this->afterInsert($item); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 77 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 78 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 79 |  |  | 	/** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 80 |  |  | 	 * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 81 |  |  | 	 * {@inheritDoc} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 82 |  |  | 	 * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 83 |  |  | 	 * @see \Ajax\common\html\HtmlCollection::insertItem() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 84 |  |  | 	 */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 85 |  |  | 	public function insertItem($item, $position=0) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 86 |  |  | 		$item=parent::insertItem($this->getItemToInsert($item), $position); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 87 |  |  | 		return $this->afterInsert($item); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 88 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 89 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 90 |  |  | 	public function generateMenuAsItem($menu, $header=null) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 91 |  |  | 		$count=$this->count(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 92 |  |  | 		$item=new HtmlSemDoubleElement("item-" . $this->identifier . "-" . $count, "div"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 93 |  |  | 		if (isset($header)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 94 |  |  | 			$headerItem=new HtmlSemDoubleElement("item-header-" . $this->identifier . "-" . $count, "div", "header"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 95 |  |  | 			$headerItem->setContent($header); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 96 |  |  | 			$item->addContent($headerItem); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 97 |  |  | 			$this->_itemHeader=$headerItem; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 98 |  |  | 		} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 99 |  |  | 		$menu->setClass("menu"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 100 |  |  | 		$item->addContent($menu); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 101 |  |  | 		return $item; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 102 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 103 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 104 |  |  | 	public function addMenuAsItem($menu, $header=null) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 105 |  |  | 		return $this->addItem($this->generateMenuAsItem($menu, $header)); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 106 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 107 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 108 |  |  | 	public function addPopupAsItem($value, $identifier, $content="") { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 109 |  |  | 		$value=new HtmlSemDoubleElement($identifier, "a", "browse item", $value); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 110 |  |  | 		$value->addContent(new HtmlIcon("", "dropdown")); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 111 |  |  | 		$value=$this->addItem($value); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 112 |  |  | 		$popup=new HtmlPopup($value, "popup-" . $this->identifier . "-" . $this->count(), $content); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 113 |  |  | 		$popup->setFlowing()->setPosition("bottom left")->setOn("click"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 114 |  |  | 		$this->wrap("", $popup); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 115 |  |  | 		return $popup; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 116 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 117 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 118 |  |  | 	public function addDropdownAsItem($value, $items=NULL) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 119 |  |  | 		$dd=$value; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 120 |  |  | 		if (\is_string($value)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 121 |  |  | 			$dd=new HtmlDropdown("dropdown-" . $this->identifier . "-" . $this->count(), $value, $items); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 122 |  |  | 		} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 123 |  |  | 		return $this->addItem($dd); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 124 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 125 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 126 |  |  | 	/** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 127 |  |  | 	 * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 128 |  |  | 	 * {@inheritDoc} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 129 |  |  | 	 * | 
            
                                                                                                            
                            
            
                                    
            
            
                | 130 |  |  | 	 * @see \Ajax\common\html\html5\HtmlCollection::createItem() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 131 |  |  | 	 */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 132 |  |  | 	protected function createItem($value) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 133 |  |  | 		$itemO=new HtmlLink("item-" . \sizeof($this->content), "", $value); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 134 |  |  | 		return $itemO->setClass("item"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 135 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 136 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 137 |  |  | 	public function setInverted() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 138 |  |  | 		return $this->addToProperty("class", "inverted"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 139 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 140 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 141 |  |  | 	public function setSecondary() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 142 |  |  | 		return $this->addToProperty("class", "secondary"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 143 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 144 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 145 |  |  | 	public function setVertical() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 146 |  |  | 		return $this->addToPropertyCtrl("class", "vertical", array ("vertical" )); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 147 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 148 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 149 |  |  | 	public function setPosition($value="right") { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 150 |  |  | 		return $this->addToPropertyCtrl("class", $value, array ("right","left" )); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 151 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 152 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 153 |  |  | 	public function setPointing($value=Direction::NONE) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 154 |  |  | 		return $this->addToPropertyCtrl("class", $value . " pointing", Direction::getConstantValues("pointing")); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 155 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 156 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 157 |  |  | 	public function asTab($vertical=false) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 158 |  |  | 		$this->apply(function (HtmlDoubleElement &$item) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 159 |  |  | 			$item->setTagName("a"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 160 |  |  | 		}); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 161 |  |  | 		if ($vertical === true) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 162 |  |  | 			$this->setVertical(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 163 |  |  | 		return $this->addToProperty("class", "tabular"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 164 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 165 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 166 |  |  | 	public function asPagination() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 167 |  |  | 		$this->apply(function (HtmlDoubleElement &$item) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 168 |  |  | 			$item->setTagName("a"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 169 |  |  | 		}); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 170 |  |  | 		return $this->addToProperty("class", "pagination"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 171 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 172 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 173 |  |  | 	public function setFixed() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 174 |  |  | 		return $this->addToProperty("class", "fixed"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 175 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 176 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 177 |  |  | 	public function setFluid() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 178 |  |  | 		return $this->addToProperty("class", "fluid"); | 
                            
                    |  |  |  | 
                                                                                        
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                | 179 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 180 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 181 |  |  | 	public function setCompact() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 182 |  |  | 		return $this->addToProperty("class", "compact"); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 183 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 184 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 185 |  |  | 	/* | 
            
                                                                                                            
                            
            
                                    
            
            
                | 186 |  |  | 	 * (non-PHPdoc) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 187 |  |  | 	 * @see \Ajax\bootstrap\html\base\BaseHtml::fromDatabaseObject() | 
            
                                                                                                            
                            
            
                                    
            
            
                | 188 |  |  | 	 */ | 
            
                                                                                                            
                            
            
                                    
            
            
                | 189 |  |  | 	public function fromDatabaseObject($object, $function) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 190 |  |  | 		$return=$function($object); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 191 |  |  | 		if (\is_array($return)) | 
            
                                                                                                            
                            
            
                                    
            
            
                | 192 |  |  | 			$this->addItems($return); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 193 |  |  | 		else | 
            
                                                                                                            
                            
            
                                    
            
            
                | 194 |  |  | 			$this->addItem($return); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 195 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 196 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 197 |  |  | 	/** | 
            
                                                                                                            
                            
            
                                    
            
            
                | 198 |  |  | 	 * Defines the menu width | 
            
                                                                                                            
                            
            
                                    
            
            
                | 199 |  |  | 	 * @param int $width | 
            
                                                                                                            
                            
            
                                    
            
            
                | 200 |  |  | 	 * @return \Ajax\semantic\html\collections\menus\HtmlMenu | 
            
                                                                                                            
                            
            
                                    
            
            
                | 201 |  |  | 	 */ | 
            
                                                                                                            
                            
            
                                                                    
                                                                                                        
            
            
                | 202 |  | View Code Duplication | 	public function setWidth($width) { | 
                            
                    |  |  |  | 
                                                                                        
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                | 203 |  |  | 		if (\is_int($width)) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 204 |  |  | 			$width=Wide::getConstants()["W" . $width]; | 
            
                                                                                                            
                            
            
                                    
            
            
                | 205 |  |  | 		} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 206 |  |  | 		$this->addToPropertyCtrl("class", $width, Wide::getConstants()); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 207 |  |  | 		return $this->addToPropertyCtrl("class", "item", array ("item" )); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 208 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 209 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 210 |  |  | 	public function addImage($identifier, $src="", $alt="") { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 211 |  |  | 		return $this->addItem(new HtmlImg($identifier, $src, $alt)); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 212 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 213 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 214 |  |  | 	public static function vertical($identifier, $items=array()) { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 215 |  |  | 		return (new HtmlMenu($identifier, $items))->setVertical(); | 
            
                                                                                                            
                            
            
                                    
            
            
                | 216 |  |  | 	} | 
            
                                                                                                            
                            
            
                                    
            
            
                | 217 |  |  |  | 
            
                                                                                                            
                            
            
                                    
            
            
                | 218 |  |  | 	public function getItemHeader() { | 
            
                                                                                                            
                            
            
                                    
            
            
                | 219 |  |  | 		return $this->_itemHeader; | 
            
                                                                                                            
                                                                
            
                                    
            
            
                | 220 |  |  | 	} | 
            
                                                        
            
                                    
            
            
                | 221 |  |  | } | 
            
                        
If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_functionexpects aPostobject, and outputs the author of the post. The base classPostreturns a simple string and outputting a simple string will work just fine. However, the child classBlogPostwhich is a sub-type ofPostinstead decided to return anobject, and is therefore violating the SOLID principles. If aBlogPostwere passed tomy_function, PHP would not complain, but ultimately fail when executing thestrtouppercall in its body.