PHP generate random string with characters [0-9a-f].

generate.php

<?php
function generateRandString() {

	$randString = '';
	while (strlen($randString) < 32) {
		// generate a character between 0-9 a-f
		$character = mt_rand(0,15);
		if ($character > 9) $character += 39;
		$randString .= chr($character + 48);
	}

	return $randString;
}


echo(generateRandString());
// something like: d31c982325d93030124d515208d2a3a7