FSHL is a free, open source, universal, fast syntax highlighter written in PHP. A very fast parser performs syntax highlighting for few languages and produces a HTML output.
FSHL library is a simple, easy to use syntax highlighter. Its API provides only one method that is really need to highlight sources and three auxiliary methods to sets lexer and output mode.
FSHL core is very flexible and it is very easy to add new languages.
There are no reported vulnerabilities
30 Day SummarySep 24 2026 — Oct 24 2026
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12 Month SummaryOct 24 2025 — Oct 24 2026
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