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# 文章來源 : 
# 作者 : FIEND (fiend@twbb.org) 
# 信箱 : fiend@twbb.org 
#################################### 

 //身份證字串檢查 
 function check_nick($id) { 

 $flag = false; 
 $id = strtoupper($id); //將英文字母全部轉成大寫 
 $id_len = strlen($id); //取得字元長度 

 
 if($id_len <= 0) { 
 return false; 
 exit; 
 } 
 if ($id_len > 10) { 
 return false; 
 exit; 
 } 
 if ($id_len < 10 && $id_len > 0) { 
 return false; 
 exit; 
 } 
 
 //檢查 第一個字母是否為英文字 
 $id_sub1 = substr($id,0,1); // 從第一個字元開始 取得字串 
 $id_sub1 = ord($id_sub1); // 回傳字串的acsii 碼 
 if ($id_sub1 > 90 || $id_sub1 < 65) { 
 return false; 
 exit; 
 } 

 //檢查 身份證字號的 第二個字元 男生或女生 
 $id_sub2 = substr($id,1,1); 
 
 if($id_sub2 !="1" && $id_sub2 != "2") { 
 return false; 
 exit; 
 } 

 for ($i=1;$i<10;$i++) { 
 $id_sub3 = substr($id,$i,1); 
 $id_sub3 = ord($id_sub3); 
 if ($id_sub3 > 57 || $id_sub3 < 48) { 
 $n=$i+1; 
 return false; 
 exit; 
 } 
 } 
 
 $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"); 

 $d1 = substr($id,0,1); // 從第一個字元開始 取得字串 
 $n1=substr($num[$d1],0,1)+(substr($num[$d1],1,1)*9); 
 $n2=0; //初使化 
 for ($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) { 
 return false; 
 exit; 
 } 
 return $this->error = true; 

 } ?>
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身份證字串檢查

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