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CodeHighlighter
http://wordpress.org/extend/plugins/code-highlighter/
http://ideathinking.com/wiki/index.php/WordPress:CodeHighlighterPlugin/

This plugin is a syntax highlighter for source code. It uses GeSHi as fontifier engine.
Put the code snippet to pre tag.
Add the lang attribute to the pre tag like the following. < pre lang="php" >
Add the lineno attribute to the pre tag after the lang tag like the following if you want to display line numbers. The number in the lineno tag becomes a start line number. There is no default value for the start line number. So you must supply the value to the lineno tag. < pre lang="php" lineno="1" >

If you want to have border, add the style like the following to your .css file: pre { border: 1px dotted #ccc; padding: 0.2em 0.5em; }

You can use many languages in lang. For example: css, html4strict, javascript, mysql, php, python, text,xml and much more.

Pozor, nefunguje s Texy, tam je zapotřebí použít speciální syntaxi (značky /—code):


<?php
echo "ahoj";
?>

*Alternativy*

SyntaxHighlighter Evolved
http://wordpress.org/extend/plugins/syntaxhighlighter/

SyntaxHighlighter Evolved allows you to easily post syntax-highlighted code to your site without losing it’s formatting or making any manual changes. It uses the SyntaxHighlighter JavaScript package by Alex Gorbatchev.

Crayon Syntax Highlighter
https://wordpress.org/plugins/crayon-syntax-highlighter/

Syntax Highlighter supporting multiple languages, themes, fonts, highlighting from a URL, or post text.

Code-prettify
https://github.com/kasparsd/code-prettify

WordPress plugin for automatic code highlighting using the Prettify library. No shortcodes, no bullshit.

Enlighter – Customizable Syntax Highlighter

Enlighter – Customizable Syntax Highlighter

Easy-to-use, syntax highlighting tool for WordPress. It’s build in PHP and uses the MooTools(Javascript) based EnlighterJS to provide a beautiful code-appearance. Using it can be as simple as selecting an editor style or adding shortcode around your scripts which you want to highlight and Enlighter takes care of the rest.