即使在“全局 $wpdb"之后 $wpdb 也是空的 [英] $wpdb is null even after 'global $wpdb

问题描述

我已经看到了几乎所有的链接，但我仍然无法解决我的问题.

我将 $wpdb 设为 null.

我是这样检查的.我在 single.php 文件中这样做

echo "
";print_r($wpdb);"
";

我检查了以下文件.全部加载完毕.

1. wp-config.php
2. wp-load.php
3. wp-includes/wp-db.php

请帮帮我.

编辑

我想像这样执行自定义查询.

$entries = $wpdb->get_results( $wpdb->prepare( "SELECT forms.form_title,entries.*FROM wp_visual_form_builder_forms AS 表单INNER JOIN wp_visual_form_builder_entries AS 条目 ON entry.form_id = forms.form_id" ) );

这不起作用.

解决方案

如果您阅读了文档，你会注意到这段话:

始终使用全局 $wpdb 变量.(记住在任何自定义函数中使用 $wpdb 之前将其全球化.)

这不是很清楚，但我认为这意味着您不能在函数之外使用 $wpdb.我建议您在主题的 functions.php 文件中创建一个函数，并从 single.php 文件中调用该函数.

I have seen almost all links but still I am unable to solve my problem.

I am getting $wpdb as null.

I am checking it like this. I am doing this in single.php file

echo "<pre>";print_r($wpdb);"</pre>";

I have checked about following files. That all are loaded.

1. wp-config.php
2. wp-load.php
3. wp-includes/wp-db.php

Please help me.

EDIT

I want to execute custom query like this.

$entries = $wpdb->get_results( $wpdb->prepare( "SELECT forms.form_title, entries. *
        FROM wp_visual_form_builder_forms AS forms
        INNER JOIN wp_visual_form_builder_entries AS entries ON   entries.form_id = forms.form_id" ) );

this is not working.

解决方案

If you read the documentation, you will notice this passage:

Always use the global $wpdb variable. (Remember to globalize $wpdb before using it in any custom functions.)

It's not very clear but I think that means you cannot use $wpdb outside of a function. What I recommend you do is create a function in your theme's functions.php file, and call that function from the single.php file.

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