PHP代码导致站点崩溃-可能存在语法错误

为了根据自定义字段查询产品，从插件高级自定义字段中，我必须使用此wp查询脚本来正确查询它。

但是，当我复制此脚本时，更改了所需的值，并将其插入到函数中。php导致网站崩溃。

我认为这是一个解析或语法错误，因为它使用了很多。我已经尝试删除其中一些，但仍然没有结果。当上面的所有其他脚本都被删除（不相关）后，它看起来如下所示：

    <?php
<?php
add_action( \'wp_ajax_posts_by_brand_action\', \'posts_by_brand_action_callback\' );

function posts_by_brand_action_callback() {
    global $wpdb; // this is how you get access to the database

    $brand = $_POST[\'brand\'];

        echo $whatever;

  // ----- START OF BRAND FILTER CODE


  // args
  $args = array(
    //\'numberposts\' => -1,
    //\'post_type\'       => \'event\',
    \'meta_key\'      => \'brand\',
    \'meta_value\'    => $brand
  );


  // query
  $the_query = new WP_Query( $args );

  <?php if( $the_query->have_posts() ): ?>
    <ul>
    <?php while( $the_query->have_posts() ) : $the_query->the_post(); ?>
      <li>
        <a href="<?php the_permalink(); ?>">
          <?php the_title(); ?>
        </a>
      </li>
    <?php endwhile; ?>
    </ul>
  <?php endif; ?>

  <?php wp_reset_query();    // Restore global post data stomped by the_post(). ?>

  // ------ END OF BRAND FILTER CODE

    wp_die(); // this is required to terminate immediately and return a proper response
}
?>

我该怎么办？这样说是否正确，即不应在内部使用？

<?php add_action( \'wp_ajax_posts_by_brand_action\', \'posts_by_brand_action_callback\' ); function posts_by_brand_action_callback() { global $wpdb; // this is how you get access to the database $brand = $_POST[\'brand\']; echo $whatever; // ----- START OF BRAND FILTER CODE // args $args = array( //\'numberposts\' => -1, //\'post_type\' => \'event\', \'meta_key\' => \'brand\', \'meta_value\' => $brand ); // query $the_query = new WP_Query( $args ); if($the_query->have_posts() ): ?> <ul> <?php while( $the_query->have_posts() ) : $the_query->the_post(); ?> <li> <a href="<?php the_permalink(); ?>"> <?php the_title(); ?> </a> </li> <?php endwhile; ?> </ul> <?php endif; wp_reset_query(); // Restore global post data stomped by the_post(). // ------ END OF BRAND FILTER CODE wp_die(); // this is required to terminate immediately and return a proper response } ?>

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