Settings::getStoragePids() 

\nn\t3::Settings()->getStoragePids($extName = NULL, $recursive = 0); 

Get ALL storagePids for the current plugin. Saved as a comma-separated list in the TypoScript setup of the extension under | plugin.tx_extname.persistence.storagePid or in the FlexForm of the plugin on the respective page.

IMPORTANT: Merge with selected StoragePID from the FlexForm only happens if $extNameis left empty.

\nn\t3::Settings()->getStoragePids(); // [123, 466]
\nn\t3::Settings()->getStoragePids('nnsite'); // [123, 466]
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Also get the child-PageUids? | true takes the value for "Recursive" from the FlexForm or from the TypoScript of the extension of plugin.tx_extname.persistence.recursive

\nn\t3::Settings()->getStoragePids(true); // [123, 466, 124, 467, 468]
\nn\t3::Settings()->getStoragePids('nnsite', true); // [123, 466, 124, 467, 468]
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Alternatively, a numerical value can also be passed for the depth / recursion can also be passed.

\nn\t3::Settings()->getStoragePids(2); // [123, 466, 124, 467, 468]
\nn\t3::Settings()->getStoragePids('nnsite', 2); // [123, 466, 124, 467, 468]
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| @return array

Source Code 

public function getStoragePids ( $extName = null, $recursive = 0 )
{
	// numerischer Wert: ->getStoragePids( 3 ) oder Boolean: ->getStoragePids( true )
	if (is_numeric($extName) || $extName === true ) {
		$recursive = $extName;
		$extName = null;
	}
	// $cObjData nur holen, falls kein extName angegeben wurde
	$cObjData = $extName === null ? [] : \nn\t3::Tsfe()->cObjData();
	$setup = $this->getPlugin( $extName  );
	// Wenn `recursive = true`, dann Wert aus FlexForm bzw. TypoScript nehmen
	$recursive = $recursive === true ? ($cObjData['recursive'] ?? $setup['persistence']['recursive'] ?? false) : $recursive;
	$pids = $cObjData['pages'] ?? $setup['persistence']['storagePid'] ?? '';
	$pids = \nn\t3::Arrays( $pids )->intExplode();
	// Child-Uids ergänzen?
	$childList = $recursive > 0 ? \nn\t3::Page()->getChildPids( $pids, $recursive ) : [];
	return array_merge( $pids, $childList );
}
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