PHP 身份验证方面的函数_php技巧
function 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 $checksum += substr($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;
}
}
?>
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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