PHP | DirectoryIterator valid() Function

Last Updated : 26 Nov, 2019
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The DirectoryIterator::valid() function is an inbuilt function in PHP which is used to check the current DirectoryIterator position is a valid file or not. Syntax: 
bool DirectoryIterator::valid( void )
Parameters: This function does not accept any parameters. Return Value: This function returns TRUE if the position is valid, otherwise returns FALSE. Below programs illustrate the DirectoryIterator::valid() function in PHP: Program 1: php 
<?php

// Create a directory Iterator
$directory = new DirectoryIterator(dirname(__FILE__));

// Move to the third element
$directory->seek(2);

// Check the validity of directory element 
if($directory->valid()) {

    // Display the filename
    echo $directory->getFilename();
}

?>
Output: 
applications.html
Program 2: php 
<?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.valid.php

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