php 压缩 html

PHP压缩HTML代码
保留code pre中的代码

function compressHtml($string) {
  $matches = array();
  preg_match_all('/(<(?:pre|code)>.+?<\/(?:pre|code)>)+/is',$string,$matches);
  foreach((array)$matches[1] as $k => $v) {
    $string = str_replace($v,"#{$k}#",$string);
  }
  $string = str_replace("\r\n",'',$string); //清除换行符
  $string = str_replace("\n",'',$string);  //清除换行符
  $string = str_replace("\t",'',$string);  //清除制表符
  $pattern = array("/> *([^ ]*) *</","/[\s]+/","/<!--[^!]*-->/","/\" /","/ \"/","'/\*[^*]*\*/'");
  $replace = array(">\\1<"," ","","\"","\"","");
  $string = preg_replace($pattern,$replace,$string);
  foreach((array)$matches[1] as $k => $v){
    $string = str_replace("#{$k}#",$v,$string);
  }
  return $string;
}

思路就是提前替换出 pre code 的块内容
在处理完之后,再替换回来

动态压缩
nginx 直接开 gzip 压缩
效率和性能比用php做要高