纯代码实现WordPress前端html代码压缩优化，php代码如下：

/**
 * 前端html代码压缩
**/
function wp_compress_html($buffer){
    $initial=strlen($buffer);
    $buffer=explode("<!--wp-compress-html-->", $buffer);
    $count=count ($buffer);
    for ($i = 0; $i <= $count; $i++){
        if (stristr($buffer[$i], '<!--wp-compress-html no compression-->')){
            $buffer[$i]=(str_replace("<!--wp-compress-html no compression-->", " ", $buffer[$i]));
        }else{
            $buffer[$i]=(str_replace("\t", " ", $buffer[$i]));
            $buffer[$i]=(str_replace("\n\n", "\n", $buffer[$i]));
            $buffer[$i]=(str_replace("\n", "", $buffer[$i]));
            $buffer[$i]=(str_replace("\r", "", $buffer[$i]));
            while (stristr($buffer[$i], '  '))
            {
            $buffer[$i]=(str_replace("  ", " ", $buffer[$i]));
            }
        }
        $buffer_out.=$buffer[$i];
    }
    $final=strlen($buffer_out);
    $savings=($initial-$final)/$initial*100;
    $savings=round($savings, 2);
    $buffer_out.="\n<!--压缩前的大小: $initial bytes; 压缩后的大小: $final bytes; 节约：$savings% -->";
    return $buffer_out;
}

调用方法：在footer.php页末尾</html>标签后添加如下php代码：

$html=ob_get_contents();
ob_get_clean();
echo wp_compress_html($html);

排除文章内容中的高亮代码块：

function unCompress($content) {
    if(preg_match_all('/(crayon-|<\/pre>)/i', $content, $matches)) {
        $content = '<!--wp-compress-html--><!--wp-compress-html no compression-->'.$content;
        $content.= '<!--wp-compress-html no compression--><!--wp-compress-html-->';
    }
    return $content;
}