包简介

A high-performance, semantic syntax highlighter for PHP 8.4+ with zero dependencies. Features context-aware parsing, language embedding, and compatibility with Highlight.js and Prism themes.

README 文档

README

Syntax highlighting for PHP projects

Server-side highlighting for the full PHP stack: 27 languages covering PHP, HTML, Twig, JavaScript, CSS, YAML, and more. Zero dependencies, semantic PHP syntax understanding definitions vs. calls, embedded language support, and 490+ compatible themes. Works in Twig templates, Laravel Blade, Symfony controllers—anywhere PHP runs.

Features

Built for PHP ecosystems: Highlight the full stack—PHP, HTML, Twig, JavaScript, CSS, SQL, YAML, and 20+ more languages in a single library.
Zero dependencies: No Node.js, Python, or external processes. Just Composer. Works in any PHP 8.4+ environment.
Full PHP syntax: Semantic parser that understands context—distinguishes class User (definition) from new User() (usage), function greet() ( definition) from greet() (call).
Embedded languages: Automatically switches parsers for <style> and <script> tags in HTML, fenced code blocks in Markdown, and {% block css %} in Twig.
Dark mode support: Multiple dark themes included out of the box ( CupertinoDark, Dracula, Noctis) plus compatibility with 490+ Highlight.js and Prism themes.

Install

composer require alto/code-highlight

Usage

use Alto\Code\Highlight\Highlighter;
use Alto\Code\Highlight\Theme\GitHubTheme;

// 1. Initialize with a theme
$highlighter = new Highlighter(new GitHubTheme());

// 2. Output the theme's CSS (typically in your <head>)
echo "<style>" . $highlighter->getTheme()->getStylesheet() . "</style>";

// 3. Highlight your code
echo $highlighter->highlight($code, 'php');

Languages

PHP

Alto uses a semantic parser for PHP that goes beyond pattern matching to understand code context. It correctly distinguishes between:

Definitions vs. usage: class User vs. new User(), function greet() vs. greet()
Context-aware scoping: Variables, function calls, class instantiation, method calls

Embeddings

Four languages support automatic embedded language detection:

HTML — CSS in <style> tags, JavaScript in <script> tags
SVG — CSS in <style> tags, JavaScript in <script> tags
Markdown — Any language in fenced code blocks (```language)
Twig — Languages via block names ({% block css %}, {% block javascript %})

Full list

Category	Languages
Programming	Bash, C#, Go, Java, JavaScript, PHP, Python, Ruby, Rust, Swift, TypeScript
Markup	HTML, SVG, XML
Data	Diff, DotEnv, HTTP, JSON, YAML
Prose	Markdown
Query	SQL
Stylesheet	CSS, SCSS
Template	Twig
Config	Dockerfile, INI, Makefile

Themes

Built-in themes

Alto includes 7 built-in themes ready to use:

Light themes: Alto, GitHub, Polar, Solar
Dark themes: CupertinoDark, Dracula, Noctis

use Alto\Code\Highlight\Theme\DraculaTheme;

$highlighter = new Highlighter(new DraculaTheme());

Dark mode

Three dark themes are included out of the box:

CupertinoDark — macOS-inspired dark theme
Dracula — Popular dark theme with vibrant colors
Noctis — Low-contrast dark theme for extended coding sessions

Compatibility

Use existing CSS from the Highlight.js (240+ themes), Prism (250+ themes), or TextMate (.tmTheme) ecosystems:

use Alto\Code\Highlight\Adapter\HighlightJsThemeAdapter;

$theme = HighlightJsThemeAdapter::fromFile('/path/to/github-dark.css');
$highlighter = new Highlighter($theme);

use Alto\Code\Highlight\Adapter\TextMateThemeAdapter;

$theme = TextMateThemeAdapter::fromFile('/path/to/monokai.tmTheme', isDark: true);
$highlighter = new Highlighter($theme);

Integrations

Twig Extension

Twig Extension — Highlight code directly in Twig templates using blocks or filters.

Contributing

Contributions are welcome! Please feel free to submit issues or pull requests.

License

Released by the Alto project under the MIT License. See the LICENSE file for details.

alto/code-highlight 适用场景与选型建议

alto/code-highlight 是一款基于 HTML 开发的 Composer 扩展包，目前已累计 9 次下载、GitHub Stars 达 1，最近一次更新时间为 2026 年 04 月 06 日，在 PHP 生态内属于活跃度较高的组件。

它主要适用于以下技术方向：「php」「themes」「tokenizer」「prism」「syntax-highlighter」「php84」等业务场景。在实际项目中，围绕这些方向常见需要落地的问题包括：接口对接、性能调优、并发安全、与既有框架（Laravel / ThinkPHP / Yii / Webman 等）的兼容适配，以及生产环境的日志埋点与稳定性保障。

我们在过去多个企业项目中使用过 alto/code-highlight 或与其功能相近的方案，如果你在选型或落地过程中遇到问题，例如 版本兼容、二次改造、私有化封装、与内部系统对接、生产 BUG 排查，欢迎联系我们协助评估。

围绕 alto/code-highlight 我们能提供哪些服务？

定制开发 / 二次开发

基于 alto/code-highlight 在你已有业务上做功能扩展、字段裁剪、UI 适配、与内部账号 / 权限 / 日志系统的深度对接。

BUG 修复 & 性能优化

线上偶发问题、内存泄漏、慢查询、并发异常等排查修复；针对高流量场景做缓存、队列、索引层面的调优。

项目外包 & 长期维护

承接完整的项目从需求 → 设计 → 开发 → 上线 → 长期运维；也可按月提供技术保姆服务。

yvsm@zunyunkeji.com QQ：316430983 微信：yvsm316 西安尊云信息科技 · 专注 PHP / Go / 分布式系统研发

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alto/code-highlight

包简介

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