php查询mysql数据库prepare语句用法，使用prepare可以优化数据库查询
$mysql = new mysqli('localhost', 'root', 'root', 'databaseName') or die('There was a problem connecting to the database');
$stmt = $mysql->prepare('SELECT id, title, content FROM tableName');
$stmt->execute();
$stmt->bind_result($id, $title, $content);
while($row = $stmt->fetch()) : ?>
<h2> <!--?php echo $title; ?--></h2>
<!--?php echo $content; ?-->
<!--?php endwhile; ?-->
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