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PHP | DirectoryIterator key() Function
  • Last Updated : 26 Nov, 2019

The DirectoryIterator::key() function is an inbuilt function in PHP which is used to return the key for the current DirectoryIterator item.

Syntax:

string DirectoryIterator::key( void )

Parameters: This function does not accept any parameters.

Return Value: This function returns the key for the current DirectoryIterator item.

Below programs illustrate the DirectoryIterator::key() function in PHP:



Program 1:




<?php
  
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
  
// Loop runs for each element of directory
foreach($directory as $dir) {
  
    // Display the key and filename
    echo $dir->key() . " => "
    $dir->getFilename() . "<br>";
}
  
?>

Output:

0 => .
1 => ..
2 => applications.html
3 => bitnami.css
4 => dashboard
5 => favicon.ico
6 => geeks.PNG
7 => gfg.php
8 => img
9 => index.php
10 => Sublime Text Build 3211 x64 Setup.exe
11 => webalizer
12 => xampp

Program 2:




<?php
  
// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));
  
// Loop runs while directory is valid
while ($directory->valid()) {
      
    // Check for directory element
    if($directory->isDir()) {
  
        // Display the key and filename
        echo $directory->key() . " => "
        $directory->getFilename() . "<br>";
    }
  
    // Move to the next element
    $directory->next();
}
  
?>

Output:

0 => .
1 => ..
4 => dashboard
8 => img
11 => webalizer
12 => xampp

Note: The output of this function depends on the content of server folder.

Reference: https://www.php.net/manual/en/directoryiterator.key.php




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