PHP detection ID card number two functions _ PHP Tutorial

PHP checks the ID number of two functions. Here we have introduced that the ID card number must be a simple one and cannot judge whether the ID card number is legal or exists. it only meets some standards, let's take a look at the two instances. here we have introduced that the ID card number must be a simple one that does not determine whether the ID card number is legal or does not exist. it only meets some standards. let's look at the two instances below.

The most accurate way to check the ID card number is through the national identity data center. I don't know if I want to know it. this is not so good. so I will introduce a method as follows, the first 17 bits are used for detection. The following is an example:

The code is as follows:
$ IdCard = '000000'; // The first 17 digits of the ID card number $ Wi = array (7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ); $ Ai = array ('1', '0', 'X', '9', '8', '7', '6', '5 ', '4', '3', '2 '); $ Sigma = null; For ($ I = 0; $ I <17; $ I ++ ){ $ Sigma + = (int) $ idCard {$ I}) * $ wi [$ I]; } Echo "ID number:". $ idCard. $ ai [($ sigma % 11)]; ?>

Example 2

The code is as follows:

Function validation_filter_id_card ($ id_card) { If (strlen ($ id_card) = 18) { Return idcard_checksum18 ($ id_card ); } Elseif (strlen ($ id_card) = 15 )) { $ Id_card = idcard_15to18 ($ id_card ); Return idcard_checksum18 ($ id_card ); } Else { Return false; } } // 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; } }

...