public function getAudioSampleRate()
    {
        if ($this->audioSampleRate === null) {
            $match = [];
            preg_match(self::$REGEX_AUDIO_SAMPLE_RATE, $this->output, $match);
            $this->audioSampleRate = (int)(array_key_exists(1, $match) ? $match[1] : 0);
        }

        return $this->audioSampleRate;
    }
public function getAudioSampleRate()
    {
        if ($this->audioSampleRate === null) {
            $match = [];
            preg_match(self::$REGEX_AUDIO_SAMPLE_RATE, $this->output, $match);
            $this->audioSampleRate = (int)(array_key_exists(1, $match) ? $match[1] : 0);
        }

        return $this->audioSampleRate;
    }
public function getAudioSampleRate ( ) { if ( $ this -> audioSampleRate === null ) { $ match = [ ] ; preg_match ( self :: $ REGEX_AUDIO_SAMPLE_RATE , $ this -> output , $ match ) ; $ this -> audioSampleRate = ( int ) ( array_key_exists ( 1 , $ match ) ? $ match [ 1 ] : 0 ) ; } return $ this -> audioSampleRate ; }
Return the audio sample rate of the media file in bits per second.

@return int
Return the audio sample rate of the media file in bits per second .