ID card verification program written in PHP_PHP tutorial

I wrote several functions related to ID cards, which I personally feel are quite useful. Especially when conducting online questionnaires, it is very useful to verify the ID card in personal information. However, there are only a few applicants, so I might as well keep it in my blog. .

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// Calculate the ID card verification code according to the national standard GB 11643-1999
function idcard_verify_number($idcard_base){
　if (strlen($idcard_base) != 17){ return false; }
// Weighting factor
$factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);

// Verification code corresponding value
$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;
}

// Upgrade the 15-digit ID card to 18 digits
function idcard_15to18( $idcard){
if (strlen($idcard) != 15){
return false;
}else{
// If the ID card sequence code is 996 997 998 999, these are Special coding for people over 100 years old
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); ;
}

//18-digit ID card verification code validity check
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; Yes, that is, the first 17 digits of the 18-digit ID card, and the last digit is called the verification code
Generally, there is no need to call idcard_verify_number() directly when using it. Most of the usual applications use the latter two functions. These functions None of them care about the format of the ID string, and check the format themselves before calling.





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Written several ID card functions, which I personally find quite useful, especially when conducting online surveys. It is very useful to verify the ID card in personal information, but there are very few people who respond, or...