php error_log（“”）以下要求

Question

I am trying to print to a log. It will work at the very top of the page but not below a require statement.

This works...

<?php 

$log_file = "../../../../errors.log"; 
$error_message = "test! 
";  
error_log($error_message, 3, $log_file);

require '../../../includes/functions.php'; // Utilities functions

However, this does not...

<?php 

require '../../../includes/functions.php'; // Utilities functions

$log_file = "../../../../errors.log"; 
$error_message = "test! 
";  
error_log($error_message, 3, $log_file);

I have tried both require and require_once. Furthermore, I added the following code to the top of the page to override any mistakes that might have been made in the php.ini file:

<?php 

ini_set('display_errors', 1);
ini_set('display_startup_errors', 1);
error_reporting(E_ALL);

require '../../../includes/functions.php'; // Utilities functions

$log_file = "../../../../errors.log"; 
$error_message = "test! 
";  
error_log($error_message, 3, $log_file);

I'm new to php and do not understand what is happening here. I also haven't found any similar reports online...

Any help would be very much appreciated.