计算身份证校验码,根据国家标准GB 11643-1999
其中的$idcard_base是指身份证中的本位码,本位码是18位身份证里才有的,也就是18位身份证的前17位,最后一位称为校验码 一般在使用的时候不用直接调用idcard_verify_number(),平时的应用大多是使用后两个函数 这些函数都没有关心身份证字符串的格式问题,在调用前自行进行格式检查
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// 计算身份证校验码,根据国家标准GB 11643-1999
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function idcard_verify_number($idcard_base){
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if (strlen($idcard_base) != 17){ return false; }
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// 加权因子
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$factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
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// 校验码对应值
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$verify_number_list = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2');
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$checksum = 0;
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for ($i = 0; $i < strlen($idcard_base); $i++){
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$checksum += substr($idcard_base, $i, 1) * $factor[$i];
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}
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$mod = $checksum % 11;
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$verify_number = $verify_number_list[$mod];
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return $verify_number;
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}
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// 将15位身份证升级到18位
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function idcard_15to18($idcard){
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if (strlen($idcard) != 15){
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return false;
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}else{
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// 如果身份证顺序码是996 997 998 999,这些是为百岁以上老人的特殊编码
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if (array_search(substr($idcard, 12, 3), array('996', '997', '998', '999')) !== false){
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$idcard = substr($idcard, 0, 6) . '18'. substr($idcard, 6, 9);
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}else{
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$idcard = substr($idcard, 0, 6) . '19'. substr($idcard, 6, 9);
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}
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}
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$idcard = $idcard . idcard_verify_number($idcard);
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return $idcard;
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}
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// 18位身份证校验码有效性检查
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function idcard_checksum18($idcard){
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if (strlen($idcard) != 18){ return false; }
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$idcard_base = substr($idcard, 0, 17);
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if (idcard_verify_number($idcard_base) != strtoupper(substr($idcard, 17, 1))){
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return false;
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}else{
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return true;
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}
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}
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