The CallbackFilterIterator class

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

    Introduction

    Examples

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

    Example #1 Available callback arguments

    <?php


    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.

    Example #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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