php - 形式<select>声明不解析完整值？我有一个工作表单代码 form.php 如下：$db = new mysqli($dbhost, $dbuser, $dbpass, $dbname); if($db->connect_errno > 0){ die('无法连接数据库 [' . $db->connect_error . ']'); } $sql = <<<SQL SELECT DISTINCT `AllianceName` FROM `City` ORDER BY

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