How to generate Random password using php | Learning Curve- Perfect Tutorial for the beginers

<?

echo $password=generatepassword();

function generatepassword()
{
	$chars = "abcdefghijklmnopqrstuvwxyz";
	$nums = "0123456789";
	$syms = "@$!*";
	 
	$finalpassword = strtoupper(substr($chars,mt_rand(0, 25),1));
	$finalpassword .= substr($chars,mt_rand(0, 25),1);
	$finalpassword .= substr($chars,mt_rand(0, 25),1);
	$finalpassword .= substr($chars,mt_rand(0, 25),1);
	$finalpassword .= substr($nums,mt_rand(0, 9),1);
	$finalpassword .= substr($syms,mt_rand(0,3),1);
	$finalpassword .= substr($nums,mt_rand(0, 9),1);
	$finalpassword .= substr($nums,mt_rand(0, 9),1);
	$finalpassword .= substr($syms,mt_rand(0,3),1);
	return $finalpassword;
}


?>

echo $password=generatepassword();

function generatepassword()

{

$chars = "abcdefghijklmnopqrstuvwxyz";

$nums = "0123456789";

$syms = "@$!*";

$finalpassword = strtoupper(substr($chars,mt_rand(0, 25),1));

$finalpassword .= substr($chars,mt_rand(0, 25),1);

$finalpassword .= substr($nums,mt_rand(0, 9),1);

$finalpassword .= substr($syms,mt_rand(0,3),1);

$finalpassword .= substr($nums,mt_rand(0, 9),1);

$finalpassword .= substr($syms,mt_rand(0,3),1);

return $finalpassword;

}