public function isImplemented($pFunction)
    {
        $pFunction = strtoupper($pFunction);
        $notImplemented = !isset(self::$phpSpreadsheetFunctions[$pFunction]) || (is_array(self::$phpSpreadsheetFunctions[$pFunction]['functionCall']) && self::$phpSpreadsheetFunctions[$pFunction]['functionCall'][1] === 'DUMMY');

        return !$notImplemented;
    }
public function isImplemented($pFunction)
    {
        $pFunction = strtoupper($pFunction);
        $notImplemented = !isset(self::$phpSpreadsheetFunctions[$pFunction]) || (is_array(self::$phpSpreadsheetFunctions[$pFunction]['functionCall']) && self::$phpSpreadsheetFunctions[$pFunction]['functionCall'][1] === 'DUMMY');

        return !$notImplemented;
    }
public function isImplemented ( $ pFunction ) { $ pFunction = strtoupper ( $ pFunction ) ; $ notImplemented = ! isset ( self :: $ phpSpreadsheetFunctions [ $ pFunction ] ) || ( is_array ( self :: $ phpSpreadsheetFunctions [ $ pFunction ] [ 'functionCall' ] ) && self :: $ phpSpreadsheetFunctions [ $ pFunction ] [ 'functionCall' ] [ 1 ] === 'DUMMY' ) ; return ! $ notImplemented ; }
Is a specific function implemented?

@param string $pFunction Function Name

@return bool
Is a specific function implemented?