PHP | FilesystemIterator key() Function

Last Updated : 26 Nov, 2019
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The FilesystemIterator::key() function is an inbuilt function in PHP which is used to retrieve the key for the current file. Syntax: 
string FilesystemIterator::key( void )
Parameters: This function does not accept any parameters. Return Value: This function returns the pathname or filename depending on the set flags. Below programs illustrate the FilesystemIterator::key() function in PHP: Program 1: php 
<?php

// Create new file system iterator
$fileItr = new FilesystemIterator(dirname(__FILE__), 
        FilesystemIterator::KEY_AS_FILENAME);

// Loop runs for each element of file iterator
foreach($fileItr as $it) {

    // Display the key
    echo $fileItr->key() . "<br>"; 
}

?>
Output: 
applications.html
bitnami.css
dashboard
favicon.ico
gfg.php
img
index.php
webalizer
xampp
Program 2: php 
<?php

// Create new file system iterator
$fileItr = new FilesystemIterator(dirname(__FILE__), 
        FilesystemIterator::KEY_AS_FILENAME);

// Loop runs while file iterator is valid
while ($fileItr->valid()) {

    // Check for non directory files
    if (!$fileItr->isDir()) {

        // Display the key
        echo $fileItr->key() . "<br>"; 
    }

    // Move to the next element
    $fileItr->next();
}

?>
Output: 
applications.html
bitnami.css
favicon.ico
gfg.php
index.php
Note: The output of this function depends on the content of server folder. Reference: https://www.php.net/manual/en/filesystemiterator.key.php

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