PHP function to verify the correctness of ID number_php example

The simplest way to verify the ID card is to judge the length. Of course, this is very simple. If we want to be more regular, we need to verify the ID number according to the generation rules. Here are some functions for us to take a look at.

Example, today I will share a PHP function to verify whether the ID number is correct.

/********************php验证身份证号码是否正确函数*********************/ 
function is_idcard( $id ) 
{ 
  $id = strtoupper($id); 
  $regx = "/(^\d{15}$)|(^\d{17}([0-9]|X)$)/"; 
  $arr_split = array(); 
  if(!preg_match($regx, $id)) 
  { 
    return FALSE; 
  } 
  if(15==strlen($id)) //检查15位 
  { 
    $regx = "/^(\d{6})+(\d{2})+(\d{2})+(\d{2})+(\d{3})$/"; 
 
    @preg_match($regx, $id, $arr_split); 
    //检查生日日期是否正确 
    $dtm_birth = "19".$arr_split[2] . '/' . $arr_split[3]. '/' .$arr_split[4]; 
    if(!strtotime($dtm_birth)) 
    { 
      return FALSE; 
    } else { 
      return TRUE; 
    } 
  } 
  else      //检查18位 
  { 
    $regx = "/^(\d{6})+(\d{4})+(\d{2})+(\d{2})+(\d{3})([0-9]|X)$/"; 
    @preg_match($regx, $id, $arr_split); 
    $dtm_birth = $arr_split[2] . '/' . $arr_split[3]. '/' .$arr_split[4]; 
    if(!strtotime($dtm_birth)) //检查生日日期是否正确 
    { 
      return FALSE; 
    } 
    else 
    { 
      //检验18位身份证的校验码是否正确。 
      //校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10。 
      $arr_int = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); 
      $arr_ch = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); 
      $sign = 0; 
      for ( $i = 0; $i < 17; $i++ ) 
      { 
        $b = (int) $id{$i}; 
        $w = $arr_int[$i]; 
        $sign += $b * $w; 
      } 
      $n = $sign % 11; 
      $val_num = $arr_ch[$n]; 
      if ($val_num != substr($id,17, 1)) 
      { 
        return FALSE; 
      } //phpfensi.com 
      else 
      { 
        return TRUE; 
      } 
    } 
  } 
 
} 

Call the ID verification function
$idc=is_idcard("ID card number");
if($idc){echo "correct";}else{echo "wrong";}

Example 2:

function validation_filter_id_card($id_card){ 
 if(strlen($id_card)==18){ 
 return idcard_checksum18($id_card); 
 }elseif((strlen($id_card)==15)){ 
 $id_card=idcard_15to18($id_card); 
 return idcard_checksum18($id_card); 
 }else{ 
 return false; 
 } 
} 
// 计算身份证校验码，根据国家标准GB 11643-1999 
function idcard_verify_number($idcard_base){ 
 if(strlen($idcard_base)!=17){ 
 return false; 
 } 
 //加权因子 
 $factor=array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2); 
 //校验码对应值 
 $verify_number_list=array('1','0','X','9','8','7','6','5','4','3','2'); 
 $checksum=0; 
 for($i=0;$i<strlen($idcard_base);$i++){ 
 $checksum += substr($idcard_base,$i,1) * $factor[$i]; 
 } 
 $mod=$checksum % 11; 
 $verify_number=$verify_number_list[$mod]; 
 return $verify_number; 
} 
// 将15位身份证升级到18位 
function idcard_15to18($idcard){ 
 if(strlen($idcard)!=15){ 
 return false; 
 }else{ 
 // 如果身份证顺序码是996 997 998 999，这些是为百岁以上老人的特殊编码 
 if(array_search(substr($idcard,12,3),array('996','997','998','999')) !== false){ 
  $idcard=substr($idcard,0,6).'18'.substr($idcard,6,9); 
 }else{ 
  $idcard=substr($idcard,0,6).'19'.substr($idcard,6,9); 
 } 
 } 
 $idcard=$idcard.idcard_verify_number($idcard); 
 return $idcard; 
} 
// 18位身份证校验码有效性检查 
function idcard_checksum18($idcard){ 
 if(strlen($idcard)!=18){ 
 return false; 
 } 
 $idcard_base=substr($idcard,0,17); 
 if(idcard_verify_number($idcard_base)!=strtoupper(substr($idcard,17,1))){ 
 return false; 
 }else{ 
 return true; 
 } 
} 

Calling methods such as: validation_filter_id_card('ID card number');

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