PHP random password generator

As a new sequel to the Excel random password generator and the Random password generator, I’ve made a PHP random password generator service…

You can call it this way (if you hover the parameter values, you’ll get an explanation):

http://www.neoegm.com/services/random_password.php?length=8&upper=1&lower=1&numbers=1

So, for example, to generate a 10 characters numeric password you could access:

http://www.neoegm.com/services/random_password.php?length=10&upper=0&lower=0

That’s all, now the code for the ones who want to use it on their own sites (read below for license)…

The code is licensed under the GNU GPL v3…

Anyway, here is the code so you can watch it without having to download the PHP file:

function make_seed()	//Function make_seed from http://www.php.net/manual/en/function.srand.php
{
  list($usec, $sec) = explode(' ', microtime());
  return (float) $sec + ((float) $usec * 100000);
}

function RandomPassword($length, $upper = true, $numbers = true, $lower = true)
{
	if (!$upper && !$lower && !$numbers)
		return "";

	$ret = "";

	$chars = 26 * 2 + 10;	//26 (a-z) + 26 (A-Z) + 10 (0-9)
		//a-z = 97-122
		//A-Z = 65-90
		//0-9 = 48-57
		
	srand(make_seed());		//Seed with microseconds
							//if you don't need this, you can just use srand(time());

	for ($i = 1; $i <= $length; $i++)
	{
		$repeat = false;

		$num = floor(rand(0, $chars-1));

		if ($num < 26)
			if ($lower)
				$ret .= chr($num + 97);
			else
				$repeat = true;
		else if ($num < 52)
			if ($upper)
				$ret .= chr($num - 26 + 65);
			else
				$repeat = true;
		else if ($num < 62)
			if ($numbers)
				$ret .= chr($num - 52 + 48);
			else
				$repeat = true;

		if ($repeat)
			$i--;
	}

	return $ret;
}

And this is the code needed to make it a web service:

$length = isset($_REQUEST['length'])?$_REQUEST['length']:8;
$upper = isset($_REQUEST['upper'])?$_REQUEST['upper']:true;
$numbers = isset($_REQUEST['numbers'])?$_REQUEST['numbers']:true;
$lower = isset($_REQUEST['lower'])?$_REQUEST['lower']:true;

if ($length < 1 || $length > 128)
	$length = 8;

if (!($upper == false || $upper == 0))
	$upper = true;

if (!($numbers == false || $numbers == 0))
	$numbers = true;
	
if (!($lower == false || $lower == 0))
	$lower = true;

echo RandomPassword($length, $upper, $numbers, $lower);

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