<?php

/**
 * Callback for CallbackFilterIterator
 *
 * @param $current   Current item's value
 * @param $key       Current item's key
 * @param $iterator  Iterator being filtered
 * @return boolean   TRUE to accept the current item, FALSE otherwise
 */
function my_callback($current, $key, $iterator) {
    // Your filtering code here
}

?>

Any callable may be used; such as a string containing a function name, an array for a method, or an anonymous function.

Приклад #2 Callback basic examples

<?php

$dir = new FilesystemIterator(__DIR__);

// Filter large files ( > 100MB)
function is_large_file($current) {
    return $current->isFile() && $current->getSize() > 104857600;
}
$large_files = new CallbackFilterIterator($dir, 'is_large_file');

// Filter directories
$files = new CallbackFilterIterator($dir, function ($current, $key, $iterator) {
    return $current->isDir() && ! $iterator->isDot();
});

?>

Зміст

CallbackFilterIterator::accept — Calls the callback with the current value, the current key and the inner iterator as arguments
CallbackFilterIterator::__construct — Create a filtered iterator from another iterator

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User Contributed Notes 3 notes

down

dave1010 at gmail dot com ¶

12 years ago

Implementation for PHP < 5.4:

<?php 
if (!class_exists('CallbackFilterIterator')) {    
    class CallbackFilterIterator extends FilterIterator {
        protected $callback;

        // "Closure" type hint should be "callable" in PHP 5.4
        public function __construct(Iterator $iterator, Closure $callback = null) {
            $this->callback = $callback;
            parent::__construct($iterator);
        }

        public function accept() {
            return call_user_func(
                $this->callback, 
                $this->current(), 
                $this->key(), 
                $this->getInnerIterator()
            );
        }
    }
}

?>

down

asadi dot jabar at outlook dot com ¶

6 years ago

CallbackFilterIterator class  didnot implement   OuterIterator interface directly

below  is the correct hierarchy 

 CallbackFilterIterator  
          |__FilterIterator
             |___  IteratorIterator
                 |____ OuterIterator 

please fix the documentation

down

tunaabutbul[plus]php[at]gmail[dot]com ¶

7 years ago

i PHP 7 you can use Anonymous classes to get the same results.

<?php 

class MyIterator implements Iterator
{
    /**
     * @var \Iterator
     */
    protected $next;

    /**
     * Collection constructor.
     *
     * @param \Iterator $next
     */
    public function __construct(Iterator $next)
    {
        $this->next = $next;
    }

    /**
     * @param callable $callback
     *
     * @return static
     */
    public function filter(callable $callback = null)
    {
        return new static(new class($this, $callback) extends FilterIterator
        {
            protected $callback;

            public function __construct(\Iterator $iterator, callable $callback = null)
            {
                parent::__construct($iterator);

                $this->callback = $callback ?: function($current) {
                    return ! empty($current);
                };;
            }

            public function accept()
            {
                return call_user_func($this->callback, parent::accept());
            }
        });
    }
   // Iterator methods ...
} 
// .......
?>

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