Searching for specific file extensions in a folder/directory (PHP)

Question

I'm trying to design a program in PHP that would allow me to find files with specific file extensions (example .jpg, .shp etc) in a known directory which consists of multiple folders. Sample code, documentation or information about what methods I will be required to use will be much appreciated.

Answer 1

glob is pretty easy:

<?php
foreach (glob("*.txt") as $filename) {
    echo "$filename size " . filesize($filename) . "\n";
}
?>

There are a few suggestions for recursive descent at the readdir page.

Answer 2

Take a look at PHP's SPL DirectoryIterator.