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($id_card); ???}else{ ???????return false; ???}}// 计算身份证校验码，根据国家标准GB 11643-1999function idcard_verify_number($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; ???}}php 验证身份证号
原文地址：https://www.cnblogs.com/scode2/p/9276719.html