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<?php
class PageClass_Controller extends Page_Controller {
  /**
	 * pass in key name to brand config associative array
	 * and return its value
	 * 
	 * @param  string $key name of key in array
	 * @return string      value from array
	 */
	public function getArrayValue($key){
		// get array
		$Config = $this->getConfig();

		if( array_key_exists($key, $this->getBrandConfig() ) )
			return $brandConfig[$key];
	}
}
?>

# template.ss
$getArrayValue(keyname)