(PHP 5 >= 5.1.0, PHP 7)
spl_autoload — Default implementation for __autoload()
spl_autoload ( string $class_name [, string $file_extensions = spl_autoload_extensions() ] ) : void
This function is intended to be used as a default implementation for __autoload(). If nothing else is specified and spl_autoload_register() is called without any parameters then this function will be used for any later call to __autoload().
class_name
The lowercased name of the class (and namespace) being instantiated.
file_extensions
By default it checks all include paths to contain filenames built up by the lowercase class name appended by the filename extensions .inc and .php.
No value is returned.
Throws LogicException when the class is not found and there are no other autoloaders registered.
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https://www.php.net/manual/en/function.spl-autoload.php