PHP Markdown is a port to PHP of the Markdown syntax by John Gruber. Markdown syntax allows users to write text naturally and format it without using HTML tags.

The PHP library converts that syntax from Markdown to HTML and back if needed. The library comes in an enhanced form, known as PHP Markdown Extra.
This special version of PHP Markdown implements some features currently not available with the plain Markdown syntax.

Features of PHP Markdown:
- Inline HTML
- Markdown Inside HTML Blocks
- Header Id Attribute
- Fenced Code Blocks
- Tables
- Definition Lists
- Footnotes
- Abbreviations
- Emphasis
- Backslash Escapes

Requirements:
- PHP 4.0.5 or Higher

What's New in this version:
- Fixed an issue preventing fenced code blocks indented inside lists items and elsewhere from being interpreted correctly.
- Fixed an issue where HTML tags inside fenced code blocks were sometime not encoded with entities.