Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
Minify HTML for WordPress without a Plugin - Add to function.php
<?php
class WP_HTML_Compression
{
// Settings
protected $compress_css = true;
protected $compress_js = true;
protected $info_comment = true;
protected $remove_comments = true;
// Variables
protected $html;
public function __construct($html)
{
if (!empty($html))
{
$this->parseHTML($html);
}
}
public function __toString()
{
return $this->html;
}
protected function bottomComment($raw, $compressed)
{
$raw = strlen($raw);
$compressed = strlen($compressed);
$savings = ($raw-$compressed) / $raw * 100;
$savings = round($savings, 2);
return '<!--HTML compressed, size saved '.$savings.'%. From '.$raw.' bytes, now '.$compressed.' bytes-->';
}
protected function minifyHTML($html)
{
$pattern = '/<(?<script>script).*?<\/script\s*>|<(?<style>style).*?<\/style\s*>|<!(?<comment>--).*?-->|<(?<tag>[\/\w.:-]*)(?:".*?"|\'.*?\'|[^\'">]+)*>|(?<text>((<[^!\/\w.:-])?[^<]*)+)|/si';
preg_match_all($pattern, $html, $matches, PREG_SET_ORDER);
$overriding = false;
$raw_tag = false;
// Variable reused for output
$html = '';
foreach ($matches as $token)
{
$tag = (isset($token['tag'])) ? strtolower($token['tag']) : null;
$content = $token[0];
if (is_null($tag))
{
if ( !empty($token['script']) )
{
$strip = $this->compress_js;
}
else if ( !empty($token['style']) )
{
$strip = $this->compress_css;
}
else if ($content == '<!--wp-html-compression no compression-->')
{
$overriding = !$overriding;
// Don't print the comment
continue;
}
else if ($this->remove_comments)
{
if (!$overriding && $raw_tag != 'textarea')
{
// Remove any HTML comments, except MSIE conditional comments
$content = preg_replace('/<!--(?!\s*(?:\[if [^\]]+]|<!|>))(?:(?!-->).)*-->/s', '', $content);
}
}
}
else
{
if ($tag == 'pre' || $tag == 'textarea')
{
$raw_tag = $tag;
}
else if ($tag == '/pre' || $tag == '/textarea')
{
$raw_tag = false;
}
else
{
if ($raw_tag || $overriding)
{
$strip = false;
}
else
{
$strip = true;
// Remove any empty attributes, except:
// action, alt, content, src
$content = preg_replace('/(\s+)(\w++(?<!\baction|\balt|\bcontent|\bsrc)="")/', '$1', $content);
// Remove any space before the end of self-closing XHTML tags
// JavaScript excluded
$content = str_replace(' />', '/>', $content);
}
}
}
if ($strip)
{
$content = $this->removeWhiteSpace($content);
}
$html .= $content;
}
return $html;
}
public function parseHTML($html)
{
$this->html = $this->minifyHTML($html);
if ($this->info_comment)
{
$this->html .= "\n" . $this->bottomComment($html, $this->html);
}
}
protected function removeWhiteSpace($str)
{
$str = str_replace("\t", ' ', $str);
$str = str_replace("\n", '', $str);
$str = str_replace("\r", '', $str);
while (stristr($str, ' '))
{
$str = str_replace(' ', ' ', $str);
}
return $str;
}
}
function wp_html_compression_finish($html)
{
return new WP_HTML_Compression($html);
}
function wp_html_compression_start()
{
ob_start('wp_html_compression_finish');
}
add_action('get_header', 'wp_html_compression_start');
?>
@wolkanca
Copy link

wolkanca commented Jun 9, 2021

my use 🙋🏻‍♂️

/* WP_HTML_Compression */
function HTML_Compression($str){
	$str = preg_replace('/<!--.*?-->/', '', $str);
	$str = str_replace(' />', '/>', $str);
	$str = preg_replace("((<pre.*?>|<code>).*?(</pre>|</code>)(*SKIP)(*FAIL)"."|\r|\n|\t)is", "", $str);
	$str = preg_replace("((<pre.*?>|<code>).*?(</pre>|</code>)(*SKIP)(*FAIL)"."|\s+)is", " ", $str);
		return $str;
}
function HTML_Compression_finish($html){
    return HTML_Compression($html);
}
add_action('get_header', function(){
	if(!is_user_logged_in()) : 
		ob_start('HTML_Compression_finish');
	endif; 
}');

@adammarciszewski
Copy link

adammarciszewski commented Aug 29, 2022

@wolkanca good small code, I would just add to your code before return:
...
$str = preg_replace("/>\s+</m", "><", $str);
...
return $str;

@jigneshbhavani
Copy link

jigneshbhavani commented Sep 15, 2022

@wolkanca @adammarciszewski Could you guys explain the purpose of adding the additional code which you have suggested? Thanks

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment