spl_autoload_functions
(PHP 5 >= 5.1.0, PHP 7)
spl_autoload_functions — Return all registered __autoload() functions
Description
spl_autoload_functions ( ) : array
Get all registered __autoload() functions.
Parameters
This function has no parameters.
Return Values
An array of all registered __autoload functions. If the autoload queue is not activated then the return value is false. If no function is registered the return value will be an empty array.
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https://www.php.net/manual/en/function.spl-autoload-functions.php