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/function-minify-html.php

Created April 6, 2016 20:52
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  1. @invalid-email-address Anonymous created this gist Apr 6, 2016.
    92 changes: 92 additions & 0 deletions function-minify-html.php
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,92 @@
    <?php

    //=============================================================================================
    // FUNCTION -> MINIFY HTML OUTPUT
    //=============================================================================================

    class WP_HTML_Compression {
    protected $compress_css = true;
    protected $compress_js = true;
    protected $info_comment = true;
    protected $remove_comments = true;

    protected $html;
    public function __construct($html) {
    if (!empty($html)) {
    $this->parseHTML($html);
    }
    }
    public function __toString() {
    return $this->html;
    }
    protected function minifyHTML($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;
    $html = '';
    foreach ($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;
    continue;
    }
    else if ($this->remove_comments) {
    if (!$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 = $this->removeWhiteSpace($content);
    }
    $html .= $content;
    }
    return $html;
    }
    public function parseHTML($html) {
    $this->html = $this->minifyHTML($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');