[PHP] 驗證身分證字號

<?php

// 自訂身證檢查函數

function check_id($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;

}