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;
}

Dampen a cotton swab or microfiber cloth with a bit of rubbing alcohol and gently clean the ear speaker cleaner sound grills. This method removes tough oils and disinfects them. Just be careful not to let too much moisture in to prevent damage.