我正在使用该功能从WordPress网站批量删除帖子wp_delete_post 和类别使用wp_delete_category. 这大约是100000篇帖子和4000个类别，过了一段时间，我得到了一个PHP错误

PHP Fatal error: Allowed memory size of ... bytes exhausted

这就是我在代码中所做的：

// get all IDs from the posts and categories
$delete_categories = $wpdb->get_col("SELECT DISTINCT(j.term_id)...");       
$delete_posts = $wpdb->get_col("SELECT DISTINCT(j.post_id)...");
$delete_parent_categories = $wpdb->get_col("SELECT tt.parent FROM $tbl_term_taxonomy tt ...");
// I removed the SQL statements for a better reading


foreach ($delete_posts as $dp) {
    echo "deleting post ".$dp."\\n";
    wp_delete_post($dp, true);
    unset($dp);
}

unset($delete_posts);

foreach ($delete_categories as $dc) {
    echo "deleting category ".$dc."\\n";
    wp_delete_category($dc);
    unset($dc);
}

unset($delete_categories);

foreach ($delete_parent_categories as $dc) {
    echo "deleting category ".$dc."\\n";
    wp_delete_category($dc);
    unset($dc);
}

unset($delete_parent_categories);

删除帖子是可行的，删除某些类别也是可行的——但在某个时候，内存限制被超过，脚本被终止。将内存限制设置为1024MB对我来说似乎不是一个完美的解决方案。

有没有办法释放WordPress功能分配的内存？

wp_suspend_cache_addition( true );