original_string: protected function leadMP3()
  	{
  		$lead = $this->ffprobeFormat("mp1", "mp2", "mp3", "mpg", "mpeg");
  
  		if ($lead === true)
  		{
  			return $this->closeCase("mp3", "audio/mpeg", $this->metadata);
  		}
  
  		return null;
  	}
code: protected function leadMP3()
  	{
  		$lead = $this->ffprobeFormat("mp1", "mp2", "mp3", "mpg", "mpeg");
  
  		if ($lead === true)
  		{
  			return $this->closeCase("mp3", "audio/mpeg", $this->metadata);
  		}
  
  		return null;
  	}
code_tokens: protected function leadMP3 ( ) { $ lead = $ this -> ffprobeFormat ( "mp1" , "mp2" , "mp3" , "mpg" , "mpeg" ) ; if ( $ lead === true ) { return $ this -> closeCase ( "mp3" , "audio/mpeg" , $ this -> metadata ) ; } return null ; }
docstring: Checks if the file is a MP3
  
  @return boolean|null
docstring_tokens: Checks if the file is a MP3