24.05.10 - Integrate GeSHi with PHP applications
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How to integrate the popular GeSHi syntax highlighter with PHP applications
GeSHi (GEneric Syntax HIghlighter) is a popular PHP library for syntax highlighting for multiple programming/markup languages. There are multiple forms for integrate it with our PHP application, one of these is using regular expressions.
Warning: GeSHi consumes high processing time, be careful. You can use a cache layer system in order to reduce it (is not the target of the article).
One posible election for integrate GeSHi (previously downloaded) in our PHP application is:
First we use the "process_content" function for searching all the <pre> tags and after that, we use the "replace_code" for replacing all the previous matchs with new proccessed HTML ones (GeSHi code).
Warning: GeSHi consumes high processing time, be careful. You can use a cache layer system in order to reduce it (is not the target of the article).
One posible election for integrate GeSHi (previously downloaded) in our PHP application is:
<?php
require_once 'geshi/geshi.php';
/**
* Replace all founded codes with processed html
* @param array $matchs matches
* @return string replace code
*/
function replace_code ($matchs)
{
trim(htmlspecialchars_decode($matchs[2]));
$geshi = new GeSHi($source, $matchs[1]);
$geshi->set_header_type(GESHI_HEADER_NONE);
$geshi->enable_classes();
return '<div class="code">' . $geshi->parse_code().'</div>';
}
/**
* Process rich content
* @param string $content non processed content
* @return string processed content
*/
function process_content ($content)
{
//Replace all the <pre> tags
$content = preg_replace_callback(
'/<pre\s+class\s*=\s*["\'](.*?)["\']>(.*?)<\/pre>/s',
'replace_code',
$content
);
//Delete all new lines (tiny code)
return str_replace(array("\n", "\r"), '', $content);
}
$content = 'This is PHP code: <pre class="php"><?php echo "hello" ?></pre>';
echo process_content($content);
?>
require_once 'geshi/geshi.php';
/**
* Replace all founded codes with processed html
* @param array $matchs matches
* @return string replace code
*/
function replace_code ($matchs)
{
trim(htmlspecialchars_decode($matchs[2]));
$geshi = new GeSHi($source, $matchs[1]);
$geshi->set_header_type(GESHI_HEADER_NONE);
$geshi->enable_classes();
return '<div class="code">' . $geshi->parse_code().'</div>';
}
/**
* Process rich content
* @param string $content non processed content
* @return string processed content
*/
function process_content ($content)
{
//Replace all the <pre> tags
$content = preg_replace_callback(
'/<pre\s+class\s*=\s*["\'](.*?)["\']>(.*?)<\/pre>/s',
'replace_code',
$content
);
//Delete all new lines (tiny code)
return str_replace(array("\n", "\r"), '', $content);
}
$content = 'This is PHP code: <pre class="php"><?php echo "hello" ?></pre>';
echo process_content($content);
?>
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