PHP身分證檢查函數

php_id_number_checker.php

<?php
// 身份證檢查函數
function check_identity($id) {

$flag = false;
$id = strtoupper($id);
$d0 = strlen($id);
$qd = "";

if ($d0 <= 0) {$qd=$qd."還沒填呢 !n";}
if ($d0 > 10) {$qd=$qd."超過10個字 !n";}
if ($d0 < 10 && $d0 > 0) {$qd=$qd."不滿10個字 !n";}

$d1 = substr($id,0,1);
$ds = ord($d1);

if ($ds > 90 || $ds < 65) {$qd=$qd."第一碼必須是大寫的英文字母 !n";}

$d2 = substr($id,1,1);

if( $d2 != "1" && $d2 != "2" ) {
  $qd = $qd."第二碼有問題 !n";
}

for ( $i=1; $i<10; $i++ ) {
  $d3 = substr($id,$i,1);
  $ds = ord($d3);
  if ($ds > 57 || $ds < 48) { $n=$i+1; $qd = $qd."第二到十碼有問題 !n";
  break;}
}

$num = array("A" => "10","B" => "11","C" => "12","D" => "13","E" => "14",
"F" => "15","G" => "16","H" => "17","J" => "18","K" => "19","L" => "20",
"M" => "21","N" => "22","P" => "23","Q" => "24","R" => "25","S" => "26",
"T" => "27","U" => "28","V" => "29","X" => "30","Y" => "31","W" => "32",
"Z" => "33","I" => "34","O" => "35");

$n1 = substr($num[$d1],0,1)+(substr($num[$d1],1,1)*9);
$n2 = 0;

for ( $j=1; $j<9; $j++) {
	$d4 = substr($id,$j,1);
	$n2 = $n2+$d4*(9-$j);
}

$n3 = $n1 + $n2 + substr( $id, 9, 1 );

if(( $n3 % 10) != 0 ) { $qd = $qd."不通過 !n"; }

if ( $qd == "" ) { $flag = true; }

return $flag;

}

// 結束

$identity = $_REQUEST["identity"];

if($identity){

		echo $identity;
		
	if(check_identity($identity)){
	
		echo "您的身份證字號<font color=blue></font>沒問題!";
		
	}else{
	
		echo "您的身份證字號<font color=red></font>有問題!";
	}
}

?>