Php BB到HTML转换器慢速加载页面

我编写了一个函数，用于用PHP将BB代码转换为HTML代码。剧本的效果非常好，但我遇到了一个大问题。页面加载时间非常慢。整个第一版都制作好了​​在数组中，但加载速度非常慢。版本2使用单独的preg_替换和str_替换，它们需要的加载时间较少，但仍然使用大文本，这会导致加载问题

有人能帮助减少这个脚本并加速加载吗

这是我的剧本：

function bb2html($bb2html)
    {
      /**********************************
      * Generator BB code to HTML
      * version: 2.5 BETA
      * updated: 19.06.2014.
      ***********************************/
        $bb2html = str_replace('[[[[','**$@$**[[', $bb2html);
        $bb2html = str_replace(']]]]',']]**@^@**', $bb2html);
        $bb2html = str_replace('[[[','**$@$**[', $bb2html);
        $bb2html = str_replace(']]]',']**@^@**', $bb2html);
        $bb2html = str_replace('[[','**$@$**', $bb2html);
        $bb2html = str_replace(']]','**@^@**', $bb2html);
      // Lovercase BB
      $allow='[c, [sp, [br, [url, [center, [left, [right, [news, [div, [span, [font, [b, [bold, [big, [small, [list, [ul, [li, [tt, [ol, [code, [quote, [block, [cite, [u, [i, [em, [p, [s, [h1, [h2, [h3, [h4, [h5, [h6, [color, [size, [img, [email, [mail, [link, [url';
      $allowed=array();
      foreach(explode(",", $allow) as $result){$result=trim($result);$allowed[]=$result;}
    while ($lowerrcase = strstr($bb2html, '['))
      {
          $k = (strpos($lowerrcase, ']') > (strpos($lowerrcase, ' ')))?' ':']';
          $lowerrcase = substr($lowerrcase, 1, strpos($lowerrcase, $k));
          $find=strstr($lowerrcase, '[');
          if(in_array('['.strtolower($find), $allowed)) $bb2html = str_replace('['.$lowerrcase, '**%^%**'.strtolower($lowerrcase), $bb2html);
          else $bb2html = str_replace('['.$lowerrcase, '**%^%**'.$lowerrcase, $bb2html);
      }  
      $bb2html=str_replace('**%^%**', '[', $bb2html);

      // Auto close opened tags
      $tags_to_close = array('[*]','[b]','[i]','[u]','[big]','[ul]','[list]','[ol]','[center]','[left]','[right]','[tt]','[s]','[code]',
          '[block]','[h1]','[h2]','[h3]','[h4]','[h5]','[h6]','[quote]');
      foreach ($tags_to_close as $key => $value)
      { 
          $open = substr_count($bb2html, $value);
          $close_tag = '[/'.substr($value, 1);
          while (substr_count($bb2html, $close_tag) < $open){$bb2html.= $close_tag;}
      }
      $check_string = preg_replace("/\[\!--(.+)--\]/i","",$bb2html); // we support comments!
      $removers = array('[hr]','[hr2]','[hr3]','[hr4]','[/br]','[/sp]','[/*]','[/c]'); // Remove some tags
      $bb2html = str_replace($removers, '', str_replace($removers, '', $check_string));
      /*
          xss clean-up
          clean up against potential xss attacks 
          adapted from the bitflux xss prevention techniques..
          http://blog.bitflux.ch/wiki/XSS_Prevention
      */
      $bb2html = implode("",explode("\\",$bb2html));
      // fix &entitiy\n; (except those named above)
      $bb2html = preg_replace('#(&\#*\w+)[\x00-\x20]+;#us',"$1;",$bb2html);
      $bb2html = preg_replace('#(&\#x*)([0-9A-F]+);*#ius',"$1$2;",$bb2html);
      $bb2html = html_entity_decode($bb2html, ENT_COMPAT);

      //$bb2html = html_entity_decode($bb2html, ENT_COMPAT, "utf-8"); // if your php is capable of this :pref:

    // remove "on" and other unnecessary attributes (we specify them all to prevent words like "one" being affected)
        $bb2html = preg_replace('#(\[[^\]]+[\x00-\x20\"\'])(onabort|onactivate|onafterprint|onafterupdate|onbeforeactivate|onbeforecopy|onbeforecut|onbeforedeactivate|onbeforeeditfocus|onbeforepaste|onbeforeprint|onbeforeunload|onbeforeupdate|onblur|onbounce|oncellchange|onchange|onclick|oncontextmenu|oncontrolselect|oncopy|oncut|ondataavailable|ondatasetchanged|ondatasetcomplete|ondblclick|ondeactivate|ondrag|ondragend|ondragenter|ondragleave|ondragover|ondragstart|ondrop|onerror|onerrorupdate|onfilterchange|onfinish|onfocus|onfocusin|onfocusout|onhelp|onkeydown|onkeypress|onkeyup|onlayoutcomplete|onload|onlosecapture|onmousedown|onmouseenter|onmouseleave|onmousemove|onmouseout|onmouseover|onmouseup|onmousewheel|onmove|onmoveend|onmovestart|onpaste|onpropertychange|onreadystatechange|onreset|onresize|onresizeend|onresizestart|onrowenter|onrowexit|onrowsdelete|onrowsinserted|onscroll|onselect|onselectionchange|onselectstart|onstart|onstop|onsubmit|onunload|xmlns|datasrc|src|lowsrc|dynsrc)[^\]]*\]#isUu',"$1]", $bb2html);
        // remove javascript and vbscript...
        $bb2html = preg_replace('#([a-z]*)[\x00-\x20]*=?[\x00-\x20]*([\`\'\"]*)[\\x00-\x20]*j[\x00-\x20]*a[\x00-\x20]*v[\x00-\x20]*a[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iUu', '$1=$2nojavascript...', $bb2html);
        $bb2html = preg_replace('#([a-z]*)[\x00-\x20]*=?([\'\"]*)[\x00-\x20]*v[\x00-\x20]*b[\x00-\x20]*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:#iUu', '$1=$2novbscript...', $bb2html);
        // style expression hacks. only works in buggy ie... (fer fuxake! get a browser!)
        $bb2html = preg_replace('#(\[[^\]]+)style[\x00-\x20]*=[\x00-\x20]*([\`\'\"]*).*expression[\x00-\x20]*\([^\]]*>#iUs', "$1\]", $bb2html);
        $bb2html = preg_replace('#(\[[^\]]+)style[\x00-\x20]*=[\x00-\x20]*([\`\'\"]*).*behaviour[\x00-\x20]*\([^\]]*>#iUs', "$1\]", $bb2html);
        $bb2html = preg_replace('#(\[[^\]]+)style[\x00-\x20]*=[\x00-\x20]*([\`\'\"]*).*s[\x00-\x20]*c[\x00-\x20]*r[\x00-\x20]*i[\x00-\x20]*p[\x00-\x20]*t[\x00-\x20]*:*[^\]]*\]>#iUus',"$1\]", $bb2html);
        // remove namespaced elements..
        $bb2html = preg_replace('#\[/*\w+:\w[^\]]*\]#is',"", $bb2html);
      // the really fun <tags>...
      do {
          $oldbb2html = $bb2html;
          $bb2html = preg_replace('#\[/*(applet|meta|xml|link|style|script|embed|object|iframe|frame|frameset|ilayer|layer|bgsound|base|sourcetext|parsererror)[^[]*\]#is',"",$bb2html);
      } while ($oldbb2html != $bb2html); // loop through to catch tricky doubles
      // leave no trace..
      if (get_magic_quotes_gpc()) $bb2html = addslashes($bb2html);
      // Pre-formatted text
      $pre = array(); $i = 9999;
      while ($pre_str = stristr($bb2html, '[pre]')) 
      {
          $pre_str = substr($pre_str, 0, strpos($pre_str, '[/pre]') + 6);
          $bb2html = str_replace($pre_str, "***pre_string***$i", $bb2html);
          $encode = str_replace("\r\n", "\n", str_replace(array('**$@$**', '**@^@**'), array('[[', ']]'), $pre_str));
          $pre[$i] = htmlentities(str_replace(array('[pre]','[/pre]'),'', $encode ), ENT_NOQUOTES, 'utf-8');
          $i++;
      }
      // Syntax highlighting
      $color_code = array(); $i = 0;
      while ($color_code_str = stristr($bb2html, '[ccc]')) 
      {
          $color_code_str = substr($color_code_str, 0, strpos($color_code_str, '[/ccc]') + 6);
          $bb2html = str_replace($color_code_str, "***ccc_string***$i", $bb2html);
          $color_code[$i] = str_replace(array('**$@$**', '**@^@**', "\r\n"), array('[[', ']]', "\n"), $color_code_str);
          $i++;
      }
      // Generic entity encode
      $bb2html = htmlentities($bb2html, ENT_NOQUOTES, 'utf-8');
        $bb2html = str_replace('&gt;','>', $bb2html);
        $bb2html = str_replace('&lt;','<', $bb2html);
        $bb2html = str_replace('[c]','&copy;', $bb2html);
        $bb2html = str_replace('[sp]','&nbsp;', $bb2html);
        $bb2html = str_replace("[br]",'<br />', $bb2html);
        $bb2html = str_replace("\r\n",'<br />', $bb2html);
        $bb2html = str_replace("\n",'<br />', $bb2html);
        $bb2html = str_replace('%0D%0A','<br />', $bb2html);
        $bb2html = str_replace("<br/>","<br />", $bb2html);
        $bb2html = str_replace("<br />","<br>", $bb2html);
        // Delete URL protocols, because will be added when convert the code PROTECTED MOD
        $bb2html = str_replace('[url=http://','[url=', $bb2html);
        $bb2html = str_replace('[url=https://','[url=', $bb2html);
        $bb2html = str_replace('[url=ftp://','[url=', $bb2html);
        $bb2html = str_replace('[url=news://','[url=', $bb2html);
        $bb2html = str_replace('[url]http://','[url]', $bb2html);
        $bb2html = str_replace('[url]https://','[url]', $bb2html);
        $bb2html = str_replace('[url]ftp://','[url]', $bb2html);
        $bb2html = str_replace('[url]news://','[url]', $bb2html);
        // other tags
        $bb2html = str_replace('[*]','<li>', $bb2html);
        $bb2html = str_replace('[/*]','</li>', $bb2html);
      // GLOBAL replace closed tags
        $bb2html = preg_replace('/\[center\](.*?)\[\/center\]/is','<div align="center">$1</div>', $bb2html);
        $bb2html = preg_replace('/\[left\](.*?)\[\/left\]/is','<div align="left">$1</div>', $bb2html);
        $bb2html = preg_replace('/\[right\](.*?)\[\/right\]/is','<div align="right">$1</div>', $bb2html);
        $bb2html = preg_replace('/\[news\](.*?)\[\/news\]/is','<div class="news" id="news">$1</div>', $bb2html);
        $bb2html = preg_replace('/\[div\](.*?)\[\/div\]/is','<div>$1</div>', $bb2html);
        $bb2html = preg_replace('/\[span\](.*?)\[\/span\]/is','<span>$1</span>', $bb2html);
        $bb2html = preg_replace('/\[font\](.*?)\[\/font\]/is','<font>$1</font>', $bb2html);
        $bb2html = preg_replace('/\[font=(.*?)\](.*?)\[\/font\]/is','<font style="font-family:$1">$2</font>', $bb2html);
        $bb2html = preg_replace('/\[b\](.*?)\[\/b\]/is','<strong>$1</strong>', $bb2html);
        $bb2html = preg_replace('/\[bold\](.*?)\[\/bold\]/is','<strong>$1</strong>', $bb2html);
        $bb2html = preg_replace('/\[strong\](.*?)\[\/strong\]/is','<strong>$1</strong>', $bb2html);
        $bb2html = preg_replace('/\[big\](.*?)\[\/big\]/is','<big>$1</big>', $bb2html);
        $bb2html = preg_replace('/\[small\](.*?)\[\/small\]/is','<small>$1</small>', $bb2html);
        $bb2html = preg_replace('/\[list\](.*?)\[\/list\]/is','<ol>$1</ol>', $bb2html);
        $bb2html = preg_replace('/\[list=(.*?)\](.*?)\[\/list\]/is','<ol start="$1">$2</ol>', $bb2html);
        $bb2html = preg_replace('/\[ul\](.*?)\[\/ul\]/is','<ul>$1</ul>', $bb2html);
        $bb2html = preg_replace('/\[li\](.*?)\[\/li\]/is','<li>$1</li>', $bb2html);
        $bb2html = preg_replace('/\[tt\](.*?)\[\/tt\]/is','<tt>$1</tt>', $bb2html);
        $bb2html = preg_replace('/\[code\](.*?)\[\/code\]/is','<code>$1</code>', $bb2html);
        $bb2html = preg_replace('/\[quote\](.*?)\[\/quote\]/is','<blockquote>$1</blockquote>', $bb2html);
        $bb2html = preg_replace('/\[block\](.*?)\[\/block\]/is','<blockquote>$1</blockquote>', $bb2html);
        $bb2html = preg_replace('/\[cite\](.*?)\[\/cite\]/is','<cite>$1</cite>', $bb2html);
        $bb2html = preg_replace('/\[u\](.*?)\[\/u\]/is','<u>$1</u>', $bb2html);
        $bb2html = preg_replace('/\[i\](.*?)\[\/i\]/is','<em>$1</em>', $bb2html);
        $bb2html = preg_replace('/\[em\](.*?)\[\/em\]/is','<em>$1</em>', $bb2html);
        $bb2html = preg_replace('/\[p\](.*?)\[\/p\]/is','<p>$1</p>', $bb2html);
        $bb2html = preg_replace('/\[s\](.*?)\[\/s\]/is','<span style="text-decoration:line-through">$1</span>', $bb2html);
        $bb2html = preg_replace('/\[h1\](.*?)\[\/h1\]/is','<h1>$1</h1>', $bb2html);
        $bb2html = preg_replace('/\[h2\](.*?)\[\/h2\]/is','<h2>$1</h2>', $bb2html);
        $bb2html = preg_replace('/\[h3\](.*?)\[\/h3\]/is','<h3>$1</h3>', $bb2html);
        $bb2html = preg_replace('/\[h4\](.*?)\[\/h4\]/is','<h4>$1</h4>', $bb2html);
        $bb2html = preg_replace('/\[h5\](.*?)\[\/h5\]/is','<h5>$1</h5>', $bb2html);
        $bb2html = preg_replace('/\[h6\](.*?)\[\/h6\]/is','<h6>$1</h6>', $bb2html);
        $bb2html = preg_replace('/\[color=(.*?)\](.*?)\[\/color\]/is','<font style="color:$1;">$2</font>', $bb2html);
        $bb2html = preg_replace('/\[size=(.*?)\](.*?)\[\/size\]/is','<span style="font-size:$1%;">$2</span>', $bb2html);
        $bb2html = preg_replace('/\[img\](.*?)\[\/img\]/is','<img src="$1">', $bb2html);
        $bb2html = preg_replace('/\[img=(.*?)\](.*?)\[\/img\]/is','<img src="$1" title="$2" alt="$2">', $bb2html);
        $bb2html = preg_replace('/\[email\]([_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3}))\[\/email\]/is','<a href="mailto:$1">$1</a>', $bb2html);
        $bb2html = preg_replace('/\[mail\]([_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,3}))\[\/mail\]/is','<a href="mailto:$1">$1</a>', $bb2html);
        $bb2html = preg_replace('/\[url\=(.*?)\](.*?)\[\/url\]/is','<a target="_blank" href="http://$1">$2</a>', $bb2html);
        $bb2html = preg_replace('/\[url\](.*?)\[\/url\]/is','<a target="_blank" href="http://$1">$1</a>', $bb2html);
        $bb2html = preg_replace('/\[link\=(.*?)\](.*?)\[\/link\]/is','<a target="_blank" href="http://$1">$2</a>', $bb2html);
        $bb2html = preg_replace('/\[link\](.*?)\[\/link\]/is','<a target="_blank" href="http://$1">$1</a>', $bb2html);
      if (get_magic_quotes_gpc()) $bb2html = implode("",explode("\\",$bb2html));
      // CLEAR TRASH
      $bb2html = preg_replace('|[[\/\!]*?[^\[\]]*?]|si', '', $bb2html);
      // for URL's, and Infini Tags..
      $bb2html = str_replace('/ >','/>', $bb2html);
     $bb2html = str_replace('-- >','-->', $bb2html);
      // XML trash
      $replace_tags=array(
          "/\<xml(.+?)\>(.+?)\<\/xml\>/is",
          "/\<w:(.+?)\>(.+?)\<\/w:(.+?)\>/is",
          "/\<o:(.+?)\>/is",
          "/<\?(.*)\? ?>/is",
          "/\<\!--(.+)--\>/i",
          "/\<\!--(.+)\>/i",
      );
     $bb2html = preg_replace($replace_tags, "", $bb2html);
     $replace_tags=false;
      // make some injection for visual code
      $bb2html = str_replace('<br>',"<br>", $bb2html);
      $bb2html = str_replace('<ol>',"<ol>\r\n", $bb2html);
      $bb2html = str_replace('</ol>',"\r\n</ol>", $bb2html);
      $bb2html = str_replace('<ul>',"<ul>\r\n", $bb2html);
      $bb2html = str_replace('</ul>',"\r\n</ul>", $bb2html);
      $bb2html = str_replace('<tt>',"<tt>\r\n", $bb2html);
      $bb2html = str_replace('</tt>',"\r\n</tt>", $bb2html);
      // re-insert the preformatted text blocks..
      $cp = count($pre) + 9998;
      for ($i=9999;$i <= $cp;$i++) {$bb2html = str_replace("***pre_string***$i", '<pre>'.$pre[$i].'</pre>', $bb2html);}
      // re-insert the colored code, we fix-up the output, too, make it xhtml strict.
      $cp = count($color_code) - 1;
      for ($i=0 ; $i <= $cp ; $i++)
      {
          $tmp_str = substr($color_code[$i], 5, -6);
          $tmp_str = highlight_string(implode("",explode("\\",$tmp_str)), true);
          $tmp_str = str_replace('font color="', 'span style="color:', $tmp_str);
          $tmp_str = str_replace('font', 'span', $tmp_str); 
          $tmp_str = (get_magic_quotes_gpc()) ? addslashes($tmp_str) : NULL;
          $bb2html = str_replace("***ccc_string***$i", $tmp_str, $bb2html);
      }
      $bb2html = implode("",explode("\\",$bb2html));
      return $bb2html;
    }

“，$bb2html）；} //重新插入彩色代码，我们也修复了输出，使其严格使用xhtml。 $cp=计数（$color\U code）-1；

---

对于（i＝0；$i）你可以考虑两个大的。 考虑缓存： 您可以将结果缓存到memcache之类的东西中 或者，您可以对输入进行转换，将HTML存储在数据库中并使用它

使用PECL扩展。

---

这在C中完成将比您的实现更快。

在“//为可视代码注入一些代码之后发现无用的行：$bb2html=str_replace（“
”，“
”，$bb2html）；是的，这是真的。我现在从代码中删除了，但那一行没有做任何更改。谢谢你的反馈嗯…我该如何使用它？你能编辑你的帖子并编写手册吗？谢谢！我可以使用更多的信息继续。你是在共享托管环境中运行还是可以安装pecl库和memcache服务器？如果不能，我们可以使用flat文件作为存储，但性能受到影响。我没有能力安装，但我可以说我的服务已安装。谢谢！