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   // 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   // 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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