protected static function fetch_supported_formats() {
        global $CFG;

        if (!isset(self::$formats)) {
            // Ask unoconv for it's list of supported document formats.
            $cmd = escapeshellcmd(trim($CFG->pathtounoconv)) . ' --show';
            $pipes = array();
            $pipesspec = array(2 => array('pipe', 'w'));
            $proc = proc_open($cmd, $pipesspec, $pipes);
            $programoutput = stream_get_contents($pipes[2]);
            fclose($pipes[2]);
            proc_close($proc);
            $matches = array();
            preg_match_all('/\[\.(.*)\]/', $programoutput, $matches);

            $formats = $matches[1];
            self::$formats = array_unique($formats);
        }

        return self::$formats;
    }
protected static function fetch_supported_formats() {
        global $CFG;

        if (!isset(self::$formats)) {
            // Ask unoconv for it's list of supported document formats.
            $cmd = escapeshellcmd(trim($CFG->pathtounoconv)) . ' --show';
            $pipes = array();
            $pipesspec = array(2 => array('pipe', 'w'));
            $proc = proc_open($cmd, $pipesspec, $pipes);
            $programoutput = stream_get_contents($pipes[2]);
            fclose($pipes[2]);
            proc_close($proc);
            $matches = array();
            preg_match_all('/\[\.(.*)\]/', $programoutput, $matches);

            $formats = $matches[1];
            self::$formats = array_unique($formats);
        }

        return self::$formats;
    }
protected static function fetch_supported_formats ( ) { global $ CFG ; if ( ! isset ( self :: $ formats ) ) { // Ask unoconv for it's list of supported document formats. $ cmd = escapeshellcmd ( trim ( $ CFG -> pathtounoconv ) ) . ' --show' ; $ pipes = array ( ) ; $ pipesspec = array ( 2 => array ( 'pipe' , 'w' ) ) ; $ proc = proc_open ( $ cmd , $ pipesspec , $ pipes ) ; $ programoutput = stream_get_contents ( $ pipes [ 2 ] ) ; fclose ( $ pipes [ 2 ] ) ; proc_close ( $ proc ) ; $ matches = array ( ) ; preg_match_all ( '/\[\.(.*)\]/' , $ programoutput , $ matches ) ; $ formats = $ matches [ 1 ] ; self :: $ formats = array_unique ( $ formats ) ; } return self :: $ formats ; }
Fetch the list of supported file formats.

@return  array
Fetch the list of supported file formats .