Office genuine authentication functions for PHP authentication

Copy CodeThe code is as follows:

Calculate ID Check code, according to national standard GB 11643-1999
function Idcard_verify_number ($idcard _base) {
if (strlen ($idcard _base)! =) {return false;}
Weighting factor
$factor = Array (7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2);
Check code corresponding value
$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 $verify _number;
}
Upgrade 15-bit ID to 18-bit
function Idcard_15to18 ($idcard) {
if (strlen ($idcard)! = 15) {
return false;
}else{
If the ID sequence code is 996 997 998 999, these are special codes for centenarians older than
if (Array_search ($idcard, substr, 3), Array (' 996 ', ' 997 ', ' 998 ', ' 999 '))!== false) {
$idcard = substr ($idcard, 0, 6). ' Substr ' ($idcard, 6, 9);
}else{
$idcard = substr ($idcard, 0, 6). ' Substr ' ($idcard, 6, 9);
}
}
$idcard = $idcard. Idcard_verify_number ($idcard);
return $idcard;
}
Verification code validity check for 18-bit ID card
function Idcard_checksum18 ($idcard) {
if (strlen ($idcard)! =) {return false;}
$idcard _base = substr ($idcard, 0, 17);
if (Idcard_verify_number ($idcard _base)! = Strtoupper (substr ($idcard, 17, 1))) {
return false;
}else{
return true;
}
}
?>

One of the $idcard_base refers to the identity card in the standard code, the standard code is 18 ID card only, that is, 18 ID card of the top 17, the last one called the check code
Generally in use when not directly call Idcard_verify_number (), the usual application is mostly using the latter two functions
None of these functions care about the format of the ID string, and do a self-formatting check before calling

The above describes the Office genuine verification PHP authentication aspects of the functions, including the Office of genuine verification content, I hope to be interested in PHP tutorial friends helpful.

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