From: https://www.cnblogs.com/chenhaoyu/p/6189207.html

 

/*** 验证身份证号码真伪* @param $id* @return bool*/
function checkIDCard( $id )
{$id = strtoupper($id);$regx = '/(^\d{15}$)|(^\d{17}([0-9]|X)$)/';if(!preg_match($regx, $id))return false;$arr_split = [];if(15 == strlen($id)){$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{$regx = '/^(\d{6})+(\d{4})+(\d{2})+(\d{2})+(\d{3})([0-9]|X)$/';@preg_match($regx, $id, $arr_split);$dtm_birth = $arr_split[2] . '/' . $arr_split[3]. '/' .$arr_split[4];if(!strtotime($dtm_birth)) //检查生日日期是否正确return false;// 检验18位身份证的校验码是否正确// 校验位按照ISO 7064:1983.MOD 11-2的规定生成，X可以认为是数字10$arr_int = [7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2];$arr_ch = ['1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'];$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;}return true;
}