/** * http://www.h5tpl.com * 是否合法的身份证号 * @param string $idcard * @return bool */ function is_idcard($idcard = '') { if (strlen($idcard) != 18) return false; $idcard_base = substr($idcard, 0, 17); if (strlen($idcard_base) != 17) return false; $factor = array(7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2); $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]; if ($verify_number == strtoupper(substr($idcard, 17, 1))) return true; return false; }
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