How can PHP developers troubleshoot issues with class file not found errors when using require_once?

When encountering a "class file not found" error in PHP while using require_once, developers can troubleshoot the issue by checking the file path and ensuring that the file containing the class definition is correctly included. They should also make sure that the file extension is correct and that the file is located in the specified directory. 

<?php
require_once 'path/to/your/class/file.php';

// Rest of your PHP code here
?>

Keywords

PHP require_once class file troubleshooting errors

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