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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace Backpack\CRUD\PanelTraits;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                trait Fields  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // ------------  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // FIELDS  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    // ------------  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Add a field to the create/update form or both.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string   $form    The form to add the field to (create/update/both)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function addField($field, $form = 'both')  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // if the field_defition_array array is a string, it means the programmer was lazy and has only passed the name  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // set some default values, so the field will still work  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (is_string($field)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $complete_field_array['name'] = $field;  | 
            
                            
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                        } else { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $complete_field_array = $field;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // if the label is missing, we should set it  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (! isset($complete_field_array['label'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $complete_field_array['label'] = ucfirst($complete_field_array['name']);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // if the field type is missing, we should set it  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (! isset($complete_field_array['type'])) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            $complete_field_array['type'] = $this->getFieldTypeFromDbColumnType($complete_field_array['name']);  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // store the field information into the correct variable on the CRUD object  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        switch (strtolower($form)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            case 'create':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->create_fields[$complete_field_array['name']] = $complete_field_array;  | 
            
                            
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                                break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            case 'update':  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->update_fields[$complete_field_array['name']] = $complete_field_array;  | 
            
                            
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                                break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            default:  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->create_fields[$complete_field_array['name']] = $complete_field_array;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->update_fields[$complete_field_array['name']] = $complete_field_array;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        // add to the tabset if there is one  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($this->getTabs()->count() > 0) { | 
            
                            
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                            $this->getTabs()->last()->fields->push(array_merge($complete_field_array, ['method' => strtolower($form)]));  | 
            
                            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function addFields($fields, $form = 'both')  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (count($fields)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($fields as $field) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->addField($field, $form);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Remove a certain field from the create/update/both forms by its name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $name Field name (as defined with the addField() procedure)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $form update/create/both  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function removeField($name, $form = 'both')  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        switch (strtolower($form)) { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case 'create':  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                array_forget($this->create_fields, $name);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            case 'update':  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                array_forget($this->update_fields, $name);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            default:  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                array_forget($this->create_fields, $name);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                array_forget($this->update_fields, $name);  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                break;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Remove many fields from the create/update/both forms by their name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array  $array_of_names A simple array of the names of the fields to be removed.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param string $form           update/create/both  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function removeFields($array_of_names, $form = 'both')  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if (! empty($array_of_names)) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            foreach ($array_of_names as $name) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                                $this->removeField($name, $form);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Check if field is the first of its type in the given fields array.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * It's used in each field_type.blade.php to determine wether to push the css and js content or not (we only need to push the js and css for a field the first time it's loaded in the form, not any subsequent times).  | 
            
                            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $field        The current field being tested if it's the first of its type.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $fields_array All the fields in that particular form.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return bool true/false  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    public function checkIfFieldIsFirstOfItsType($field, $fields_array)  | 
            
                            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($field['name'] == $this->getFirstOfItsTypeInArray($field['type'], $fields_array)['name']) { | 
            
                            
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                    118
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                            return true;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    119
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    121
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                        return false;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    125
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                     * Order the fields in a certain way.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    127
                 | 
                                    
                                                     | 
                
                 | 
                     * @param [string] Column name.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    128
                 | 
                                    
                                                     | 
                
                 | 
                     * @param [attributes and values array]  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    129
                 | 
                                    
                                                     | 
                
                 | 
                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    130
                 | 
                                    
                                                     | 
                
                 | 
                    public function setFieldOrder($fields)  | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    131
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    132
                 | 
                                    
                                                     | 
                
                 | 
                        // TODO  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    133
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    134
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    135
                 | 
                                    
                                                     | 
                
                 | 
                    // ALIAS of setFieldOrder($fields)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    136
                 | 
                                    
                                                     | 
                
                 | 
                    public function setFieldsOrder($fields)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    137
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    138
                 | 
                                    
                                                     | 
                
                 | 
                        $this->setFieldOrder($fields);  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    139
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    140
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    141
                 | 
                                    
                                                     | 
                
                 | 
                    // ------------  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    142
                 | 
                                    
                                                     | 
                
                 | 
                    // TONE FUNCTIONS - UNDOCUMENTED, UNTESTED, SOME MAY BE USED  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    143
                 | 
                                    
                                                     | 
                
                 | 
                    // ------------  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    144
                 | 
                                    
                                                     | 
                
                 | 
                    // TODO: check them  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    145
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    146
                 | 
                                    
                                                     | 
                
                 | 
                    public function orderFields($order)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    147
                 | 
                                    
                                                     | 
                
                 | 
                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    148
                 | 
                                    
                                                     | 
                
                 | 
                        $this->setSort('fields', (array) $order); | 
            
                            
                    | 
                        
                     | 
                     | 
                     | 
                    
                                                                                                    
                        
                         
                                                                                        
                                                                                     
                     | 
                
            
                                                                                                            
                            
            
                                    
            
            
                | 
                    149
                 | 
                                    
                                                     | 
                
                 | 
                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
                | 
                    150
                 | 
                                    
                                                     | 
                
                 | 
                }  | 
            
            
                                                        
            
                                    
            
            
                | 
                    151
                 | 
                                    
                                                     | 
                
                 | 
                 | 
            
            
                        
Adding an explicit array definition is generally preferable to implicit array definition as it guarantees a stable state of the code.
Let’s take a look at an example:
As you can see in this example, the array
$myArrayis initialized the first time when the foreach loop is entered. You can also see that the value of thebarkey is only written conditionally; thus, its value might result from a previous iteration.This might or might not be intended. To make your intention clear, your code more readible and to avoid accidental bugs, we recommend to add an explicit initialization $myArray = array() either outside or inside the foreach loop.