How can one troubleshoot file path issues when requiring external files in PHP scripts?

When requiring external files in PHP scripts, file path issues can arise if the path specified is incorrect. To troubleshoot this, you can use the `__DIR__` magic constant to get the absolute path of the current file and then construct the path to the external file relative to that. 

// Get the absolute path of the current file
$currentPath = __DIR__;

// Construct the path to the external file relative to the current file
$externalFilePath = $currentPath . '/path/to/external/file.php';

// Require the external file using the correct path
require_once $externalFilePath;

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file path require include troubleshooting PHP script

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