DirectoryIterator::key

(PHP 5, PHP 7, PHP 8)

DirectoryIterator::key — Return the key for the current DirectoryIterator item

Descrizione

public DirectoryIterator::key(): mixed

Get the key for the current DirectoryIterator item.

Elenco dei parametri

Questa funzione non contiene parametri.

Valori restituiti

The key for the current DirectoryIterator item as an int.

Log delle modifiche

Versione	Descrizione
8.1.0	When the iterator is uninitialized, an Error is thrown now. Previously, the method returned `false`.

Esempi

Example #1 A DirectoryIterator::key() example

<?php
$dir = new DirectoryIterator(dirname(__FILE__));
foreach ($dir as $fileinfo) {
    if (!$fileinfo->isDot()) {
        echo $fileinfo->key() . " => " . $fileinfo->getFilename() . "\n";
    }
}
?>

Il precedente esempio visualizzerà qualcosa simile a:

0 => apple.jpg
1 => banana.jpg
2 => index.php
3 => pear.jpg

Vedere anche:

DirectoryIterator::current() - Return the current DirectoryIterator item
DirectoryIterator::next() - Move forward to next DirectoryIterator item
DirectoryIterator::rewind() - Rewind the DirectoryIterator back to the start
DirectoryIterator::valid() - Check whether current DirectoryIterator position is a valid file
Iterator::key() - Return the key of the current element

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