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* GeSHi example script
* Just point your browser at this script (with geshi.php in the parent directory,
* and the language files in subdirectory "../geshi/")
* @author Nigel McNie
* @version $Id: example.php 1512 2008-07-21 21:05:40Z benbe $
header('Content-Type: text/html; charset=utf-8');
// Rudimentary checking of where GeSHi is. In a default install it will be in ../, but
// it could be in the current directory if the include_path is set. There's nowhere else
// we can reasonably guess.
if (is_readable('../geshi.php')) {
$path = '../';
} elseif (is_readable('geshi.php')) {
$path = './';
} else {
die('Could not find geshi.php - make sure it is in your include path!');
require $path . 'geshi.php';
$fill_source = false;
if (isset($_POST['submit'])) {
if (get_magic_quotes_gpc()) {
$_POST['source'] = stripslashes($_POST['source']);
if (!strlen(trim($_POST['source']))) {
$_POST['language'] = preg_replace('#[^a-zA-Z0-9\-_]#', '', $_POST['language']);
$_POST['source'] = implode('', @file($path . 'geshi/' . $_POST['language'] . '.php'));
$_POST['language'] = 'php';
} else {
$fill_source = true;
// Here's a free demo of how GeSHi works.
// First the initialisation: source code to highlight and the language to use. Make sure
// you sanitise correctly if you use $_POST of course - this very script has had a security
// advisory against it in the past because of this. Please try not to use this script on a
// live site.
$geshi = new GeSHi($_POST['source'], $_POST['language']);
// Use the PRE_VALID header. This means less output source since we don't have to output &nbsp;
// everywhere. Of course it also means you can't set the tab width.
// HEADER_PRE_VALID puts the <pre> tag inside the list items (<li>) thus producing valid HTML markup.
// HEADER_PRE puts the <pre> tag around the list (<ol>) which is invalid in HTML 4 and XHTML 1
// HEADER_DIV puts a <div> tag arount the list (valid!) but needs to replace whitespaces with &nbsp
// thus producing much larger overhead. You can set the tab width though.
// Enable CSS classes. You can use get_stylesheet() to output a stylesheet for your code. Using
// CSS classes results in much less output source.
// Enable line numbers. We want fancy line numbers, and we want every 5th line number to be fancy
$geshi->enable_line_numbers(GESHI_FANCY_LINE_NUMBERS, 5);
// Set the style for the PRE around the code. The line numbers are contained within this box (not
// XHTML compliant btw, but if you are liberally minded about these things then you'll appreciate
// the reduced source output).
$geshi->set_overall_style('font: normal normal 90% monospace; color: #000066; border: 1px solid #d0d0d0; background-color: #f0f0f0;', false);
// Set the style for line numbers. In order to get style for line numbers working, the <li> element
// is being styled. This means that the code on the line will also be styled, and most of the time
// you don't want this. So the set_code_style reverts styles for the line (by using a <div> on the line).
// So the source output looks like this:
// <pre style="[set_overall_style styles]"><ol>
// <li style="[set_line_style styles]"><div style="[set_code_style styles]>...</div></li>
// ...
// </ol></pre>
$geshi->set_line_style('color: #003030;', 'font-weight: bold; color: #006060;', true);
$geshi->set_code_style('color: #000020;', true);
// Styles for hyperlinks in the code. GESHI_LINK for default styles, GESHI_HOVER for hover style etc...
// note that classes must be enabled for this to work.
$geshi->set_link_styles(GESHI_LINK, 'color: #000060;');
$geshi->set_link_styles(GESHI_HOVER, 'background-color: #f0f000;');
// Use the header/footer functionality. This puts a div with content within the PRE element, so it is
// affected by the styles set by set_overall_style. So if the PRE has a border then the header/footer will
// appear inside it.
$geshi->set_header_content('<SPEED> <TIME> GeSHi &copy; 2004-2007, Nigel McNie, 2007-2008 Benny Baumann. View source of example.php for example of using GeSHi');
$geshi->set_header_content_style('font-family: sans-serif; color: #808080; font-size: 70%; font-weight: bold; background-color: #f0f0ff; border-bottom: 1px solid #d0d0d0; padding: 2px;');
// You can use <TIME> and <VERSION> as placeholders
$geshi->set_footer_content('Parsed in <TIME> seconds at <SPEED>, using GeSHi <VERSION>');
$geshi->set_footer_content_style('font-family: sans-serif; color: #808080; font-size: 70%; font-weight: bold; background-color: #f0f0ff; border-top: 1px solid #d0d0d0; padding: 2px;');
} else {
// make sure we don't preselect any language
$_POST['language'] = null;
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
<html xmlns="" xml:lang="en" lang="en">
<title>GeSHi examples</title>
<style type="text/css">
if (isset($_POST['submit'])) {
// Output the stylesheet. Note it doesn't output the <style> tag
echo $geshi->get_stylesheet(true);
html {
background-color: #f0f0f0;
body {
font-family: Verdana, Arial, sans-serif;
margin: 10px;
border: 2px solid #e0e0e0;
background-color: #fcfcfc;
padding: 5px;
h2 {
margin: .1em 0 .2em .5em;
border-bottom: 1px solid #b0b0b0;
color: #b0b0b0;
font-weight: normal;
font-size: 150%;
h3 {
margin: .1em 0 .2em .5em;
color: #b0b0b0;
font-weight: normal;
font-size: 120%;
#footer {
text-align: center;
font-size: 80%;
color: #a9a9a9;
#footer a {
color: #9999ff;
textarea {
border: 1px solid #b0b0b0;
font-size: 90%;
color: #333;
margin-left: 20px;
select, input {
margin-left: 20px;
p {
font-size: 90%;
margin-left: .5em;
<h2>GeSHi Example Script</h2>
<p>To use this script, make sure that <strong>geshi.php</strong> is in the parent directory or in your
include_path, and that the language files are in a subdirectory of GeSHi's directory called <strong>geshi/</strong>.</p>
<p>Enter your source and a language to highlight the source in and submit, or just choose a language to
have that language file highlighted in PHP.</p>
if (isset($_POST['submit'])) {
// The fun part :)
echo $geshi->parse_code();
echo '<hr />';
<form action="<?php echo basename($_SERVER['PHP_SELF']); ?>" method="post">
<h3>Source to highlight</h3>
<textarea rows="10" cols="60" name="source" id="source"><?php echo $fill_source ? htmlspecialchars($_POST['source']) : '' ?></textarea>
<h3>Choose a language</h3>
<select name="language" id="language">
if (!($dir = @opendir(dirname(__FILE__) . '/geshi'))) {
if (!($dir = @opendir(dirname(__FILE__) . '/../geshi'))) {
echo '<option>No languages available!</option>';
$languages = array();
while ($file = readdir($dir)) {
if ( $file[0] == '.' || strpos($file, '.', 1) === false) {
$lang = substr($file, 0, strpos($file, '.'));
$languages[] = $lang;
foreach ($languages as $lang) {
if (isset($_POST['language']) && $_POST['language'] == $lang) {
$selected = 'selected="selected"';
} else {
$selected = '';
echo '<option value="' . $lang . '" '. $selected .'>' . $lang . "</option>\n";
<input type="submit" name="submit" value="Highlight Source" />
<input type="submit" name="clear" onclick="document.getElementById('source').value='';document.getElementById('language').value='';return false" value="clear" />
<div id="footer">GeSHi &copy; Nigel McNie, 2004, released under the GNU GPL<br />
For a better demonstration, check out the <a href="">online demo</a>