Use php to verify the valid ID card function

Using php to verify the ID card function is very authoritative. it is very useful to verify the ID card in personal information. using php to verify the ID card function is very authoritative. it is very practical to verify the ID card in personal information.
// Calculate the ID card verification code based on 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 );
// Check code 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 the 15-digit ID card to 18-digit
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 codes for elderly people over years old
If (array_search (substr ($ idcard, 12, 3), array ('20160301', '20160301', '20160301 '))! = 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;
}
// Check the validity of the 18-digit ID card verification code
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;
}
}
?>
$ Idcard_base indicates the local code in the ID card. this code is only available in 18-digit ID cards, that is, the first 17 digits of the 18-digit ID card. the last digit is called the verification code.
Generally, you do not need to directly call idcard_verify_number () when using idcard_verify_number (). most common applications use the last two functions. these functions do not care about the format of the ID card string. you must perform a format check before calling the function.