표준 PHP 라이브러리(SPL) The CallbackFilterIterator class

Iterators

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


소개


클래스 개요
                  
class CallbackFilterIterator extends FilterIterator {

  /* Methods */
  public __construct(Iterator $iterator, callable $callback)
  public accept(): bool

  /* Inherited methods */
  public FilterIterator::accept(): bool
  public FilterIterator::current(): mixed
  public FilterIterator::getInnerIterator(): Iterator
  public FilterIterator::key(): mixed
  public FilterIterator::next(): void
  public FilterIterator::rewind(): void
  public FilterIterator::valid(): bool
  public IteratorIterator::current(): mixed
  public IteratorIterator::getInnerIterator(): ?Iterator
  public IteratorIterator::key(): mixed
  public IteratorIterator::next(): void
  public IteratorIterator::rewind(): void
  public IteratorIterator::valid(): bool
}

Examples

콜백은 각각 현재 항목, 현재 키 및 반복자의 최대 3개의 인수를 허용해야 합니다.

예제 #1 사용 가능한 콜백 인수

                  
<?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
}

?>

모든 callable 항목을 사용할 수 있습니다. 예를 들어 함수 이름을 포함하는 문자열, 메서드의 배열 또는 익명 함수.

예제 #2 콜백 기본 예

                  
<?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();
});

?>

목차

PHP

웹학교

참조