一旦我用以下错误消息将WordPress更新到5.3版：

[17-Nov-2019 01:15:14 UTC] PHP Warning:  array_map(): Argument #2 should be an array in /home/name/public_html/web/wp-includes/class-wp-query.php on line 2069
[17-Nov-2019 01:15:14 UTC] PHP Warning:  implode(): Invalid arguments passed in /home/name/public_html/web/wp-includes/class-wp-query.php on line 2069
[17-Nov-2019 01:15:14 UTC] WordPress database error You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near \') AND ( 
  wpuw_term_relationships.term_taxonomy_id IN (9)
) AND ( 
  wpuw_postm\' at line 1 for query SELECT SQL_CALC_FOUND_ROWS  wpuw_posts.ID FROM wpuw_posts  LEFT JOIN wpuw_term_relationships ON (wpuw_posts.ID = wpuw_term_relationships.object_id) INNER JOIN wpuw_postmeta ON ( wpuw_posts.ID = wpuw_postmeta.post_id ) WHERE 1=1  AND wpuw_posts.ID NOT IN () AND ( 
  wpuw_term_relationships.term_taxonomy_id IN (9)
) AND ( 
  wpuw_postmeta.meta_key = \'ecpt_toparticle\'
) AND wpuw_posts.post_type = \'post\' AND (wpuw_posts.post_status = \'publish\' OR wpuw_posts.post_status = \'private\') GROUP BY wpuw_posts.ID ORDER BY wpuw_posts.post_date DESC LIMIT 0, 5 made by require(\'wp-blog-header.php\'), require_once(\'wp-includes/template-loader.php\'), include(\'/themes/mydesign/category.php\'), WP_Query->__construct, WP_Query->query, WP_Query->get_posts

在中category.php 代码：

<?php
$args = array(
    \'meta_key\'=> \'ecpt_toparticle\',
    \'showposts\' => 5,
    \'category__in\' => $cat,
    \'post__not_in\' => $tag
);
$sticky_query = new WP_Query( $args );
while ( $sticky_query->have_posts() ) : $sticky_query->the_post();
?>

它也不适用于Select标记：

<option value="?tag=usa" <?php if ($tag == usa) echo \'selected="selected" \';?>>Usa</option>

到目前为止，我唯一的解决方案是恢复到WordPress版本5.2.4。

$args = array(                 // then the query args
    \'posts_per_page\' => 5, // you should use posts_per_page and not showposts
    \'post_type\'      => \'post\',
    \'tag\'            => get_query_var( \'tag\' )
);

$sticky_query = new WP_Query( $args );

<?php $tag = get_query_var( \'tag\' ); ?>
<select name="formal" class="city-choice" onchange="handleSelect(this)"
    data-action="<?php echo esc_url( add_query_arg( \'tag\', \'%tag%\' ) ); ?>">
    <option value="">Select a tag</option>
    <option value="usa" <?php selected( $tag, \'usa\' ); ?>>Usa</option>
    <option value="italy" <?php selected( $tag, \'italy\' ); ?>>Italy</option>
</select>

<script type="text/javascript">
function handleSelect(elm) {
    window.location = elm.dataset.action.replace( \'%tag%\', elm.value );
}
</script>