PHP 身份證號驗證函數
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($id_card); } else { return false; } } // 計算身份證校驗碼,根據國家標準GB 11643-1999 function idcard_verify_number($idcard_base) { if(strlen($idcard_base) != 17) { return false; } //加權因子 $factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); //校驗碼對應值 $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 $verify_number; } // 將15位身份證升級到18位 function idcard_15to18($idcard){ if (strlen($idcard) != 15){ return false; }else{ // 如果身份證順序碼是996 997 998 999,這些是為百歲以上老人的特殊編碼 if (array_search(substr($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); } } $idcard = $idcard . idcard_verify_number($idcard); return $idcard; } // 18位身份證校驗碼有效性檢查 function idcard_checksum18($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; } }
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