Civil ID Validation for Kuwait Citizen using PHP

php_civilid.php

function validate_civilid($str) {
	$valid = false;
			
	if(preg_match("/[0-9]/{12}", $str)) {
		$test = ((substr($str, 0, 1) * 2) + ((substr($str, 1, 1) * 1) + ((substr($str, 2, 1) * 6) + ((substr($str, 3, 1) * 3) + ((substr($str, 4, 1) * 7) + ((substr($str, 5, 1) * 9) + ((substr($str, 6, 1) * 10) + ((substr($str, 7, 1) * 5) + ((substr($str, 8, 1) * 8) + ((substr($str, 9, 1) * 4) + ((substr($str, 10, 1) * 2) ) % 11;
				
		if($test == substr($str, 11, 1)) $valid = true;
	}
			
	return $valid;
}

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