PasswordHash::get_random_bytes( $count )

72	function get_random_bytes($count)73	{74		$output = '';75		if (@is_readable('/dev/urandom') &&76		    ($fh = @fopen('/dev/urandom', 'rb'))) {77			$output = fread($fh, $count);78			fclose($fh);79		}80 81		if (strlen($output) < $count) {82			$output = '';83			for ($i = 0; $i < $count; $i += 16) {84				$this->random_state =85				    md5(microtime() . $this->random_state);86				$output .= md5($this->random_state, TRUE);87			}88			$output = substr($output, 0, $count);89		}90 91		return $output;92	}