PHP highlighter

PHP code highlighter.

Contents

• Features
• Requirements
• Usage
  • Highlighting code
  • Marking an active line
  • Specifying line range

Features

• highlighting files or strings
• highlighting specific line ranges
• marking an active line
• produces an ordered list (<ol>) with corresponding line numbers

Requirements

• PHP 7.1+

Usage

Highlighting code

• PhpHighlighter::file() - highlight a PHP file
• PhpHighlighter::code() - highlight a string of PHP code

<?php

use Kuria\PhpHighlighter\PhpHighlighter;

$php = <<<'PHP'
<?php

echo "Hello world!";

PHP;

echo PhpHighlighter::code($php);

Output:

<ol>
<li><span style="color: #0000BB">&lt;?php</span></li>
<li></li>
<li><span style="color: #007700">echo&nbsp;</span><span style="color: #DD0000">"Hello&nbsp;world!"</span><span style="color: #007700">;</span></li>
<li></li>
</ol>

Note

In PHP 8.3, output of the highlight_file() and highlight_string() functions (which are used internally) has changed.

If you're using PHP 8.3 or newer, the output will contain regular spaces instead of   entities. You can use white-space: pre; in your CSS to fix this.

Marking an active line

An active line can be specified using the second argument.

The active line will have a class="active" attribute.

<?php

echo PhpHighlighter::code($php, 3);

Specifying line range

A line range can be specified using the third argument.

Example line ranges:

• NULL - highlight all lines
• [20, 30] - highlight lines from 20 to 30 (absolute)
• [-5, 5] - highlight 5 lines around the active line (requires active line)
• [0, 0] - highlight the active line only (requires active line)

<?php

echo PhpHighlighter::code($php, 3, [-1, 1]);