How to generates a password salt (default = 15) characters

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<?php

/**
 * This function generates a password salt as a string of x (default = 15) characters
 * ranging from a-zA-Z0-9.
 * @param $max integer The number of characters in the string
 * @author AfroSoft <scripts@afrosoft.co.cc>
 */
function generateSalt($max = 15) {
	$characterList = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
	$i = 0;
	$salt = "";
	do {
		$salt .= $characterList{mt_rand(0,strlen($characterList))};
		$i++;
	} while ($i <= $max);
	return $salt;
}

?>
/** end of http://code.activestate.com/recipes/576894/ }}} */

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