<?php

class MyClass
{

    public function readId3()
    {
        $mp3OrFlacFile = '/path/to/file';
        
        /** @var Sapar\Id3\Metadata\Id3MetadataInterface */
        $id3Metadata = new Sapar\Metadata\Id3Metadata($mp3OrFlacFile);
        
        /** @var Sapar\Wrapper\BinWrapper\BinWrapperInterface */
        $mediaInfoWrapper = new Sapar\Wrapper\BinWrapper\MediainfoWrapper();
        $mediaInfoWrapper->setBin('/usr/local/bin/mediainfo');
        
		if ($mediaInfoWrapper->read($metaDataFile)) {
			$metaDataFile->getTitle();
			$metaDataFile->getArtist();
			$metaDataFile->getAlbum();
			$metaDataFile->getGenre();
			$metaDataFile->getYear();
			$metaDataFile->getBpm();
			$metaDataFile->getTimeDuration();
		}
    }

}

<?php

class MyClass
{

    public function writeId3()
    {
        $mp3OrFlacFile = '/path/to/file';
        
        /** @var Sapar\Id3\Metadata\Id3MetadataInterface */
        $id3Metadata = new Sapar\Metadata\Id3Metadata($mp3OrFlacFile);
		$id3Metadata->setAlbum('album');
		$id3Metadata->setTitle('title');
		$id3Metadata->setGenre('genre');
		$id3Metadata->setYear(2016);
		$id3Metadata->setComment('comment');
		$id3Metadata->setBpm(120);
		
        /** @var Sapar\Wrapper\BinWrapper\BinWrapperInterface */
        $id3v2wrapper = new Sapar\Wrapper\BinWrapper\Id3v2Wrapper();
        $id3v2wrapper->setBin('/usr/local/bin/id3v2');
        
		if ($mediaInfoReader->write($metaDataFile)) {
			//it's done!
		}
    }

<?php

class MyClass
{

}