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<?php
function genRndString($length = 10, $chars = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ')
{
	if($length > 0)
	{
		$len_chars = (strlen($chars) - 1);
		$the_chars = $chars{rand(0, $len_chars)};
		for ($i = 1; $i < $length; $i = strlen($the_chars))
		{
			$r = $chars{rand(0, $len_chars)};
			if ($r != $the_chars{$i - 1}) $the_chars .=  $r;
		}

		return $the_chars;
	}
}

?>

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<?php
echo genRndString();
?>