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<?php |
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/* |
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* This file is part of the Slince/China package. |
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* |
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* (c) Slince <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace China\IDCard; |
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/** |
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* 算法摘自 |
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* {@link https://www.cnblogs.com/bossikill/p/3679926.html}. |
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*/ |
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final class IDCardUtils |
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{ |
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/** |
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* 计算身份证最后一位. |
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* |
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* @param string $IDCardBody |
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* |
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* @return bool|number |
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*/ |
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public static function calcIDCardCode($IDCardBody) |
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{ |
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if (strlen($IDCardBody) != 17) { |
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return false; |
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} |
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//加权因子 |
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$factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); |
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//校验码对应值 |
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$code = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); |
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$checksum = 0; |
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for ($i = 0; $i < strlen($IDCardBody); ++$i) { |
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$checksum += substr($IDCardBody, $i, 1) * $factor[$i]; |
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} |
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return $code[$checksum % 11]; |
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} |
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/** |
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* 将15位身份证升级到18位. |
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* |
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* @param number $id |
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* |
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* @return bool|string |
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*/ |
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public static function convertIDCard15to18($id) |
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{ |
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if (strlen($id) != 15) { |
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return false; |
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} else { |
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// 如果身份证顺序码是996 997 998 999，这些是为百岁以上老人的特殊编码 |
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if (array_search(substr($id, 12, 3), array('996', '997', '998', '999')) !== false) { |
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$IDCard = substr($id, 0, 6).'18'.substr($id, 6, 9); |
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} else { |
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$IDCard = substr($id, 0, 6).'19'.substr($id, 6, 9); |
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} |
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} |
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return $id.static::calcIDCardCode($id); |
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} |
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/** |
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* 18位身份证校验码有效性检查. |
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* |
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* @param number $IDCard |
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* |
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* @return bool |
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*/ |
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public static function check18IDCard($IDCard) |
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{ |
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if (strlen($IDCard) != 18) { |
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return false; |
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} |
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$IDCardBody = substr($IDCard, 0, 17); //身份证主体 |
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$IDCardCode = strtoupper(substr($IDCard, 17, 1)); //身份证最后一位的验证码 |
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if (static::calcIDCardCode($IDCardBody) != $IDCardCode) { |
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return false; |
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} else { |
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return true; |
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} |
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} |
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} |
slince /
China
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This check looks for variable assignements that are either overwritten by other assignments or where the variable is not used subsequently.
Both the
$myVarassignment in line 1 and the$higherassignment in line 2 are dead. The first because$myVaris never used and the second because$higheris always overwritten for every possible time line.