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<?php |
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namespace Raidros\Collection; |
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use Raidros\Collection\Exceptions\CollectionItemNotFoundException; |
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use Raidros\Collection\Exceptions\InvalidCollectionItemInstanceException; |
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class Collection |
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{ |
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/** |
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* Collection items. |
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* |
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* @var array |
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*/ |
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private $items = []; |
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/** |
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* Implementation namespace. |
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* |
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* @var string |
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*/ |
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private $classname; |
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/** |
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* Create a new collection instance. |
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* |
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* @param string|null $classname Class or interface of namespace for implementation |
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*/ |
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public function __construct($classname = null) |
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{ |
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$this->classname = $classname; |
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} |
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/** |
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* Add a new item to collection. |
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* |
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* @param string $name |
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* @param mixed $value |
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* |
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* @return self |
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*/ |
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public function put($name, $value) |
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{ |
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if (is_object($value) && !$this->isValidObjectInstance($value)) { |
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throw new InvalidCollectionItemInstanceException(sprintf('%s must implement %s', $name, $this->classname)); |
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} |
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$this->items[$name] = $value; |
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return $this->items[$name]; |
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} |
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/** |
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* Verify's if the given object has a valid instance. |
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* |
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* @param object $object |
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* |
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* @return bool |
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*/ |
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private function isValidObjectInstance($object) |
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{ |
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if (!is_null($this->classname) && !$this->isInstanceOrSubclassOf($object)) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check object instance. |
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* |
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* @param object $object |
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* |
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* @return bool |
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*/ |
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private function isInstanceOrSubclassOf($object) |
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{ |
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return $object instanceof $this->classname or is_subclass_of($object, $this->classname); |
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} |
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/** |
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* Get all items from collection. |
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* |
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* @return array |
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*/ |
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public function all() |
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{ |
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return $this->items; |
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} |
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/** |
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* Find collection item by name. |
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* |
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* @param string $name |
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* |
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* @return mixed|null |
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*/ |
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public function find($name) |
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{ |
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if ($this->has($name)) { |
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return $this->items[$name]; |
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} |
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} |
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/** |
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* Check if the given item exists on collection. |
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* |
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* @param string $name |
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* |
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* @return bool |
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*/ |
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public function has($name) |
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{ |
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return array_key_exists($name, $this->items); |
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} |
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/** |
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* Find a specific collection item or throw's an exception. |
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* |
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* @param string $name |
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* |
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* @return mixed |
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*/ |
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public function findOrFail($name) |
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{ |
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$result = $this->find($name); |
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if (is_null($result)) { |
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throw new CollectionItemNotFoundException(sprintf('Collection item "%s" not found', $name)); |
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} |
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return $result; |
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} |
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/** |
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* Run a callback over each item. |
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* |
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* @param callable $callback |
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* |
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* @return self |
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*/ |
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public function each(callable $callback) |
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{ |
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if (!count($this->items)) { |
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return $this; |
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} |
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foreach ($this->items as $key => $value) { |
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$callback($value, $key); |
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} |
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} |
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/** |
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* Remove an item from collection. |
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* |
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* @param string $name |
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* |
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* @return self |
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*/ |
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public function remove($name) |
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{ |
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if ($this->has($name)) { |
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unset($this->items[$name]); |
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} |
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return $this; |
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} |
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} |
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raidros /
collection
PHP has two types of connecting operators (logical operators, and boolean operators):
and&&or||The difference between these is the order in which they are executed. In most cases, you would want to use a boolean operator like
&&, or||.Let’s take a look at a few examples:
Logical Operators are used for Control-Flow
One case where you explicitly want to use logical operators is for control-flow such as this:
Since
dieintroduces problems of its own, f.e. it makes our code hardly testable, and prevents any kind of more sophisticated error handling; you probably do not want to use this in real-world code. Unfortunately, logical operators cannot be combined withthrowat this point:These limitations lead to logical operators rarely being of use in current PHP code.