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                判斷身份證號碼是否合規 ``` <?php // 檢查身份證號是否正確 function checkIdCard($number) { $number = getIDCard($number); // 轉化為大寫,如出現x $number = strtoupper($number); //加權因子 $wi = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); //校驗碼串 $ai = array('1', '0', 'X', '9', '8', '7', '6', '5', '4', '3', '2'); //按順序循環處理前17位 $sigma = 0; for ($i = 0;$i < 17;$i++) { //提取前17位的其中一位,并將變量類型轉為實數 $b = (int) $number{$i}; //提取相應的加權因子 $w = $wi[$i]; //把從身份證號碼中提取的一位數字和加權因子相乘,并累加 $sigma += $b * $w; } //計算序號 $snumber = $sigma % 11; //按照序號從校驗碼串中提取相應的字符。 $check_number = $ai[$snumber]; if ($number{17} == $check_number) { return true; } else { return false; } } ```
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