身分證字號檢查

身分證字號檢查

/*****************************************************
/* 名稱           : checkNick
 * 功能           : 身分證字號檢查。
 ****************************************************/
function checkNick($id){

	//建立字母分數陣列
	$head = array('A'=>1,'I'=>39,'O'=>48,'B'=>10,'C'=>19,'D'=>28,'E'=>37,'F'=>46,'G'=>55,'H'=>64,'J'=>73,'K'=>82,
              'L'=>2,'M'=>11,'N'=>20,'P'=>29,'Q'=>38,'R'=>47,'S'=>56,'T'=>65,'U'=>74,'V'=>83,'W'=>21,'X'=>3,'Y'=>12,'Z'=>30,
              'a'=>1,'i'=>39,'o'=>48,'b'=>10,'c'=>19,'d'=>28,'e'=>37,'f'=>46,'g'=>55,'h'=>64,'j'=>73,'k'=>82,
              'l'=>2,'m'=>11,'n'=>20,'p'=>29,'q'=>38,'r'=>47,'s'=>56,'t'=>65,'u'=>74,'v'=>83,'w'=>21,'x'=>3,'y'=>12,'z'=>30
	);

	$multiply = array(8,7,6,5,4,3,2,1); //建立加權基數陣列

	//檢查身份字格式是否正確
	if (preg_match("/^[a-zA-Z][1-2][0-9]+$/",$id) && strlen($id) == 10){
		$len = strlen($id); //切開字串

		for($i=0; $i<$len; $i++){
			$stringArray[$i] = substr($id,$i,1);
		}

		$total = $head[array_shift($stringArray)]; //取得字母分數
		$point = array_pop($stringArray); //取得比對碼
		$len = count($stringArray); //取得數字分數

		for($j=0; $j<$len; $j++){
			$total += $stringArray[$j]*$multiply[$j];
		}

		if (($total%10 == 0 )?0:10-$total%10 != $point) { //檢查比對碼
			return false;
		} else {
			return true;
		}

	}  else {
		return false;
	}

}