You can also look up for these other topics:
Framework
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Tool
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Hacktoberfest
A Parser for CSS Files written in PHP. Allows extraction of CSS files into a data structure, manipulation of said structure and output as (optimized) CSS
sabberwormAn early-stage PHP parser designed for IDE usage scenarios.
microsoftA fully tested email parser for PHP 8.0+ (mailparse extension wrapper).
php-mime-mail-parserPHP library for parsing plain text email content.
willdurand