PHP detection ID Number two functions _php tutorial

We introduce the ID card number is definitely a simple can not judge the identity card number is not legal or exist, just meet some criteria on it, see below two examples.

Detection of identity card number, the most accurate affirmation is through the National Identity Data center detection, think and do not know, this thing is not so good to get, so the following describes a method, through the first 17 bits to detect, directly on the example:

The code is as follows	Copy Code
$idCard = ' 12345678901234567 ';//ID number first 17 digits $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 < $i + +) { $sigma + = ((int) $idCard {$i}) * $wi [$i]; } echo "ID number:". $idCard. $ai [($sigma% 11)]; ?>

Example 2

The code is as follows

Copy Code

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 ($id _card); } Else { return false; } } Calculate ID Check code, according to national standard GB 11643-1999 function Idcard_verify_number ($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 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; } }

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