TCA::getConfig() 

\nn\t3::TCA()->getConfig($path = ''); 

Get a configuration from the TCA for a path. Returns a reference to the config array of the corresponding field.

\nn\t3::TCA()->getConfig('tt_content.columns.tx_mask_iconcollection');
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| @return array

Source Code 

public function &getConfig( $path = '' ) {
	$parts = \nn\t3::Arrays($path)->trimExplode('.');
	$ref = &$GLOBALS['TCA'];
	while (count($parts) > 0) {
		$part = array_shift($parts);
		$ref = &$ref[$part];
	}
	$ref = &$ref['config'];
	return $ref;
}
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