Registry::set() 

\nn\t3::Registry()->set($extName = '', $path = '', $settings = [], $clear = false); 

Save a value in the sys_registry table. Data in this table is retained beyond the session. For example, a scheduler job can save when it was last executed. was executed.

Arrays are recursively merged / merged by default:

\nn\t3::Registry()->set( 'nnsite', 'lastRun', ['one'=>'1'] );
\nn\t3::Registry()->set( 'nnsite', 'lastRun', ['two'=>'2'] );

\nn\t3::Registry()->get( 'nnsite', 'lastRun' ); // => ['one'=>1, 'two'=>2]
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With true at the end, the previous values are deleted:

\nn\t3::Registry()->set( 'nnsite', 'lastRun', ['one'=>'1'] );
\nn\t3::Registry()->set( 'nnsite', 'lastRun', ['two'=>'2'], true );

\nn\t3::Registry()->get( 'nnsite', 'lastRun' ); // => ['two'=>2]
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| @return array

Source Code 

public function set ( $extName = '', $path = '', $settings = [], $clear = false )
{
	$registry = GeneralUtility::makeInstance( CoreRegistry::class );
	if (!$clear && is_array($settings)) {
		$curSettings = $this->get( $extName, $path ) ?: [];
		$settings = \nn\t3::Arrays( $curSettings )->merge( $settings, true, true );
	}
	$registry->set( $extName,  $path, $settings );
	return $settings;
}
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