Generate random bytes from /dev/urandom/

simpleRGP.php

function gen_random_pass($length=20) {
  return (function_exists('openssl_random_pseudo_bytes')) ?
		base64_encode(openssl_random_pseudo_bytes($length))
			: base64_encode(mcrypt_create_iv($length, MCRYPT_DEV_URANDOM));
}

$generate = gen_random_pass();

echo 'Generated password: '.$generate;

file_put_contents('pass.txt', $generate."\r\n\r\n", FILE_APPEND);