The require function cannot recognize and load the php file in the current folder.

Question

<p>My question may be a little strange, but it really confuses me! </p><p>In my child theme I used to be able to call and load files adjacent to the function.php file without any issues, but after deleting and reinserting all the files in the subfolder , the files are not recognized. I used the following command. </p><p>In the function.php file, I called its subsidiary file user_function.php, but even with the command, it was not recognized. </p><p><code></code><code></code></p> <pre class="brush:php;toolbar:false;">if (file_exists('user_function.php')) { require_once('user_function.php'); } else { echo "Please try back in 30 minutes...n"; die; }</pre> <p>The file cannot be recognized! and an error message appears! ! !

There are only these two files in: </p><p><br /></p> <ul> <li><code>function.php</code></li> <li><code>user_function.php</code></li> </ul> <p>What's the problem? (These instructions are not complicated or difficult, I have used these instructions many times before in different places, but now they are a challenge for me)</p><p>I have used them many times in other topics Switch between, even the parent template</p><p> Update:</p><p>I encountered a strange problem! Now, I want to load other files in function.php and user_function.php, I have to use __DIR__ to specify the path, I think the problem must be somewhere else! I submitted a hosting support request and they said there was an issue a few hours ago where the connection to the database was lost and they didn't explain what happened but I think it may have caused the problem and broke my WordPress path or address. Is this possible? </p><p><strong></strong><strong></strong><strong><code></code></strong></p>

Answer 1

It may be because the function.php file is called from another file in another directory.

To avoid ambiguity, you can use the full path by providing __DIR__ to return the directory of the current file, so that PHP will search for the user_function.php file in the same directory as the function.php file:

// in function.php
if (file_exists(__DIR__.'/user_function.php')) {
     require_once(__DIR__.'/user_function.php');
} else {
     echo "Please try back in 30 minutes...\n";
     die;
}