ID Card Verification

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))  //Check 15-bit     {          $regx  =  "/^ (\d{6}) + (\d{2}) + (\d{2}) + (\d{2}) + (\d{3}) $/";          @preg_match ($regx,  $id,  $arr _split);         //Check that the birthday date is correct          $dtm _birth  =  "$arr _split[2] .  '/'  .  $arr _split[3].  '/'  . $arr _split[4];         if (!strtotime ($dtm _birth))         {             return false;        } else {             return TRUE;         }    }    else            //Check 18-bit     {         $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)   //Check that the birthday date is correct &NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;{&NBsp;           return false;         }        else         {            // Verify that the check code for the 18-digit ID is correct.             //check digit according to iso 7064:1983.mod  11-2 of the rules generated, X can be considered the number 10.              $arr _int = array (7, 9,  10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, &NBSP;4,&NBSP;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;             }             else            {                 return TRUE;             }         }    }}

ID Card Verification