lz-string is designed to fulfill the need of storing large amounts of data in localStorage, specifically on mobile devices. Due to the limitation of a maximum of 5MB in the local storage one possible solution is to compress the data right before storing it locally. In case you want to transfer your stored data from / to a php service you can use this library to (en)code the data.

This code is originally based on the LZ-String javascript version found here: https://pieroxy.net/blog/pages/lz-string/index.html and is a 1:1 copy/translation into php.

<?php
\LZCompressor\LZString::compressToBase64($rawstr);

composer require nullpunkt/lz-string-php

• v1.3.0 Upgraded codebase to be compatible to PHP 8. [Thanks to https://github.com/jchodzicki]

• v1.2.1 Fixed overhead that happens with PHP UTF-8 string indexing. The calculation complexity was raising exponentially and became unusable when the compressed message was even less than 1MBytes. [Thanks to https://github.com/peetervois]

• v1.2.0 Added utf16 functionality

• v1.1.0 Completely rewritten LZString component to match the output of js-lz-string version 1.4.4
• PHPUnit tests for continuous testing / comparision of lz-string js

• Added v1.0.0 to packagist/composer nullpunkt/lz-string-php

• Overhaul and refactor by https://github.com/Korcholis

• Small Bugfix added (Thanks to Filipe)

• Added support for special chars like é,È, ... [Thanks to https://github.com/carlholmberg]