public function start_conversion(stored_file $file, $format, $forcerefresh = false) {
        $conversions = conversion::get_conversions_for_file($file, $format);

        if ($forcerefresh || count($conversions) > 1) {
            while ($conversion = array_shift($conversions)) {
                if ($conversion->get('id')) {
                    $conversion->delete();
                }
            }
        }

        if (empty($conversions)) {
            $conversion = new conversion(0, (object) [
                'sourcefileid' => $file->get_id(),
                'targetformat' => $format,
            ]);
            $conversion->create();
        } else {
            $conversion = array_shift($conversions);
        }

        if ($conversion->get('status') !== conversion::STATUS_COMPLETE) {
            $this->poll_conversion($conversion);
        }

        return $conversion;
    }
public function start_conversion(stored_file $file, $format, $forcerefresh = false) {
        $conversions = conversion::get_conversions_for_file($file, $format);

        if ($forcerefresh || count($conversions) > 1) {
            while ($conversion = array_shift($conversions)) {
                if ($conversion->get('id')) {
                    $conversion->delete();
                }
            }
        }

        if (empty($conversions)) {
            $conversion = new conversion(0, (object) [
                'sourcefileid' => $file->get_id(),
                'targetformat' => $format,
            ]);
            $conversion->create();
        } else {
            $conversion = array_shift($conversions);
        }

        if ($conversion->get('status') !== conversion::STATUS_COMPLETE) {
            $this->poll_conversion($conversion);
        }

        return $conversion;
    }
public function start_conversion ( stored_file $ file , $ format , $ forcerefresh = false ) { $ conversions = conversion :: get_conversions_for_file ( $ file , $ format ) ; if ( $ forcerefresh || count ( $ conversions ) > 1 ) { while ( $ conversion = array_shift ( $ conversions ) ) { if ( $ conversion -> get ( 'id' ) ) { $ conversion -> delete ( ) ; } } } if ( empty ( $ conversions ) ) { $ conversion = new conversion ( 0 , ( object ) [ 'sourcefileid' => $ file -> get_id ( ) , 'targetformat' => $ format , ] ) ; $ conversion -> create ( ) ; } else { $ conversion = array_shift ( $ conversions ) ; } if ( $ conversion -> get ( 'status' ) !== conversion :: STATUS_COMPLETE ) { $ this -> poll_conversion ( $ conversion ) ; } return $ conversion ; }
Start the conversion for a stored_file into a new format.

@param   stored_file $file The file to convert
@param   string $format The desired target file format (file extension)
@param   boolean $forcerefresh If true, the file will be converted every time (not cached).
@return  conversion conversion object
Start the conversion for a stored_file into a new format .