The CallbackFilterIterator class

(PHP 5 >= 5.4.0, PHP 7, PHP 8)

简介

类摘要

class CallbackFilterIterator extends FilterIterator {
/* 方法 */
public __construct(Iterator $iterator, callable $callback)
public accept(): bool
/* 继承的方法 */
}

示例

The callback should accept up to three arguments: the current item, the current key and the iterator, respectively.

示例 #1 Available callback arguments

<?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.

示例 #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();
});

?>

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