Function in PHP to verify whether the ID card is legal

This article mainly introduces the function of PHP to verify whether the ID card is legal. It has a very good reference value. Let’s take a look at it with the editor.

Without further ado, please look at the code:

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;
      }
      else
      {
        return TRUE;
      }
    }
  }
}

The above is the entire content of this article, I hope it will be helpful to everyone's study.

Related recommendations:

php basicsfunctiondetailed explanation

php implements variable length parameter processingFunctionDetailed explanation

str_pad() in phpFunctionDetailed explanation of usage

The above is the detailed content of Function in PHP to verify whether the ID card is legal. For more information, please follow other related articles on the PHP Chinese website!