话不多说，请看代码：
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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($regx,$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(7,9,10,5,8,4,2,1,6,3,7,2);
$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;
}
}
}
}
