Randomly choose a file

randomFile.php

<?php
/**
 * Randomly chooses a file from the given directory.
 * @param directory Optional. The directory to search. Defaults to the current directory.
 * @param ext Optional. An array of accepted file extensions to match. Defaults to standard images.
 * @return A string representing the name of the file
 */
function randomFile($directory = ".", $ext = array("jpg", "jpeg", "gif", "png", "bmp")) {
	// Find file matches using glob
	$files = glob($directory."/*.{".implode(",",$ext)."}", GLOB_BRACE);

	// Randomly choose a file
	$rand = mt_rand(0, count($files) - 1);
	$file = $files[$rand];
	return $file;
}
?>