Nén HTML trên WordPress tăng tốc độ tải trang cho website

class WP_HTML_Compression{
protected $wp_compress_css = true;
protected $wp_compress_js = true;
protected $wp_info_comment = true;
protected $wp_remove_comments = true;
protected $html;
public function __construct($html)
{
if (!empty($html)) {
$this->wp_parseHTML($html);
}
}
public function __toString()
{
return $this->html;
}
protected function wp_bottomComment($raw, $compressed)
{
$raw = strlen($raw);
$compressed = strlen($compressed);
$savings = ($raw - $compressed) / $raw * 100;
$savings = round($savings, 2);
return '<!-- Nén HTML, giảm được ' . $savings . '%. từ ' . $raw . ' bytes, còn lại ' . $compressed . ' bytes. (Ném HTML, CSS, JS với code Foxtheme) -->';
}
protected function wp_minifyHTML($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;
$html = '';
foreach ($matches as $token) {
$tag = (isset($token['tag'])) ? strtolower($token['tag']) : null;
$content = $token[0];
$strip = true;
if (is_null($tag)) {
if (!empty($token['script'])) {
require_once(get_template_directory() . '/minify-js.php');
if ($this->wp_compress_js) {
$content = \JShrink\Minifier::minify($content);
}
$strip = false; // loai bo ham wp_removeWhiteSpace() cho <script>
} else if (!empty($token['style'])) {
$strip = $this->wp_compress_css;
} else if ($content == '<!--wp-html-compression no compression-->') {
$overriding = !$overriding;
continue;
} else if ($this->wp_remove_comments) {
if (!$overriding && $raw_tag != 'textarea') {
$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;
$content = preg_replace('/(\s+)(\w++(?<!\baction|\balt|\bcontent|\bsrc)="")/', '$1', $content);
$content = str_replace(' />', '/>', $content);
}
}
}
if ($strip) {
$content = $this->wp_removeWhiteSpace($content);
}
$html .= $content;
}
return $html;
}

public function wp_parseHTML($html)
{
$this->html = $this->wp_minifyHTML($html);
if ($this->wp_info_comment) {
$this->html .= "\n" . $this->wp_bottomComment($html, $this->html);
}
}
protected function wp_removeWhiteSpace($str)
{
$str = str_replace("\t", ' ', $str);
$str = str_replace("\n", '', $str);
$str = str_replace("\r", '', $str);
$str = str_replace(" This function requires postMessage and CORS (if the site is cross domain).", '', $str);
while (stristr($str, ' ')) {
$str = str_replace(' ', ' ', $str);
}
return $str;
}
}
function wp_html_compression_finish($html)
{
return new WP_HTML_Compression($html);
}
function wp_wp_html_compression_start()
{
ob_start('wp_html_compression_finish');
}
add_action('get_header', 'wp_wp_html_compression_start');