How can PHP constants like __FILE__ be used to retrieve information about the currently opened site?

To retrieve information about the currently opened site, PHP constants like __FILE__ can be used to get the full path and filename of the current script. This can be useful for tasks like including files relative to the current script or determining the base URL of the site. 

// Get the full path and filename of the current script
$currentScript = __FILE__;

// Output the current script's path and filename
echo "The current script is located at: " . $currentScript;

Keywords

PHP constants __FILE__ retrieve information currently opened site

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