PHP | DirectoryIterator valid() Function

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:

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<?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();
}
  
?>

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Output:

applications.html

Program 2:

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<?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();
}
  
?>

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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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