这个HTML优化代码的开头是做什么的？

Question

困难的部分是试图找出strip空格()函数的作用。stripbuffer()非常简单，但我已经盯着这段代码看了一段时间了，试图对其进行解密，但没有结果。神秘的变量名和缺少注释也没有多大帮助。我还不得不从学分中删除一些超链接，因为在这个网站上防止了垃圾邮件。

<?php 
/* ---------------------------------
26 January, 2008 - 2:55pm:

The example below is adapted from a post by londrum 8:29 pm on June 7, 2007: 
"crunch up your HTML into a single line
a handy little script..."

This PHP code goes at the very TOP of the PHP-enabled HTML webpage
above EVERYTHING else. Recommendation: use a PHP include file for this
to have only one file to maintain. 
--------------------------------- */
function stripwhitespace($bff){
    $pzcr=0;
    $pzed=strlen($bff)-1;
    $rst="";
    while($pzcr<$pzed){
        $t_poz_start=stripos($bff,"<textarea",$pzcr);
        if($t_poz_start===false){
            $bffstp=substr($bff,$pzcr);
            $temp=stripBuffer($bffstp);
            $rst.=$temp;
            $pzcr=$pzed;
        }
        else{
            $bffstp=substr($bff,$pzcr,$t_poz_start-$pzcr);
            $temp=stripBuffer($bffstp);
            $rst.=$temp;
            $t_poz_end=stripos($bff,"</textarea>",$t_poz_start);
            $temp=substr($bff,$t_poz_start,$t_poz_end-$t_poz_start);
            $rst.=$temp;
            $pzcr=$t_poz_end;
        }
    }
    return $rst;
}

function stripBuffer($bff){
    /* carriage returns, new lines */
    $bff=str_replace(array("\r\r\r","\r\r","\r\n","\n\r","\n\n\n","\n\n"),"\n",$bff);
    /* tabs */
    $bff=str_replace(array("\t\t\t","\t\t","\t\n","\n\t"),"\t",$bff);
    /* opening HTML tags */
    $bff=str_replace(array(">\r<a",">\r <a",">\r\r <a","> \r<a",">\n<a","> \n<a","> \n<a",">\n\n <a"),"><a",$bff);
    $bff=str_replace(array(">\r<b",">\n<b"),"><b",$bff);
    $bff=str_replace(array(">\r<d",">\n<d","> \n<d",">\n <d",">\r <d",">\n\n<d"),"><d",$bff);
    $bff=str_replace(array(">\r<f",">\n<f",">\n <f"),"><f",$bff);
    $bff=str_replace(array(">\r<h",">\n<h",">\t<h","> \n\n<h"),"><h",$bff);
    $bff=str_replace(array(">\r<i",">\n<i",">\n <i"),"><i",$bff);
    $bff=str_replace(array(">\r<i",">\n<i"),"><i",$bff);
    $bff=str_replace(array(">\r<l","> \r<l",">\n<l","> \n<l",">  \n<l","/>\n<l","/>\r<l"),"><l",$bff);
    $bff=str_replace(array(">\t<l",">\t\t<l"),"><l",$bff);
    $bff=str_replace(array(">\r<m",">\n<m"),"><m",$bff);
    $bff=str_replace(array(">\r<n",">\n<n"),"><n",$bff);
    $bff=str_replace(array(">\r<p",">\n<p",">\n\n<p","> \n<p","> \n <p"),"><p",$bff);
    $bff=str_replace(array(">\r<s",">\n<s"),"><s",$bff);
    $bff=str_replace(array(">\r<t",">\n<t"),"><t",$bff);
    /* closing HTML tags */
    $bff=str_replace(array(">\r</a",">\n</a"),"></a",$bff);
    $bff=str_replace(array(">\r</b",">\n</b"),"></b",$bff);
    $bff=str_replace(array(">\r</u",">\n</u"),"></u",$bff);
    $bff=str_replace(array(">\r</d",">\n</d",">\n </d"),"></d",$bff);
    $bff=str_replace(array(">\r</f",">\n</f"),"></f",$bff);
    $bff=str_replace(array(">\r</l",">\n</l"),"></l",$bff);
    $bff=str_replace(array(">\r</n",">\n</n"),"></n",$bff);
    $bff=str_replace(array(">\r</p",">\n</p"),"></p",$bff);
    $bff=str_replace(array(">\r</s",">\n</s"),"></s",$bff);
    /* other */
    $bff=str_replace(array(">\r<!",">\n<!"),"><!",$bff);
    $bff=str_replace(array("\n<div")," <div",$bff);
    $bff=str_replace(array(">\r\r \r<"),"><",$bff);
    $bff=str_replace(array("> \n \n <"),"><",$bff);
    $bff=str_replace(array(">\r</h",">\n</h"),"></h",$bff);
    $bff=str_replace(array("\r<u","\n<u"),"<u",$bff);
    $bff=str_replace(array("/>\r","/>\n","/>\t"),"/>",$bff);
    $bff=ereg_replace(" {2,}",' ',$bff);
    $bff=ereg_replace("  {3,}",'  ',$bff);
    $bff=str_replace("> <","><",$bff);
    $bff=str_replace("  <","<",$bff);
    /* non-breaking spaces */
    $bff=str_replace(" &nbsp;","&nbsp;",$bff);
    $bff=str_replace("&nbsp; ","&nbsp;",$bff);
    /* Example of EXCEPTIONS where I want the space to remain
    between two form buttons at */ 
    /* <!-- http://websitetips.com/articles/copy/loremgenerator/ --> */
    /* name="select" /> <input */
    $bff=str_replace(array("name=\"select\" /><input"),"name=\"select\" /> <input",$bff);

    return $bff;
}
ob_start("stripwhitespace");
?>

Answer 1

在我看来，它似乎压缩了文本区域之前和文本区域之后的所有内容，但它只保留文本区域的内容。

虽然这段代码可能有点有趣，但PHP在快速字符串操作方面却是出了名的糟糕，所有这些str_replace调用都是一个糟糕的主意。

我预测通过在web服务器上使用gzip/deflate在发送之前压缩脚本输出，您将获得更好的性能。

Answer 2

这绝对是一团糟，但似乎它从字符串中删除了不必要的空白，除了文本区域。

Answer 3

很明显，stripBuffer做了什么:它试图从它的输入中删除所有空白。

stripwhitespace的工作如下：

function stripwhitespace($input){
    $currentPosition=0; // start from the first char
    $endPosition=strlen($input)-1; // where to stop
    $returnValue="";

    // while there is more input to process
    while($currentPosition<$endPosition){
        // find start of next <textarea> tag
        $startOfNextTextarea=stripos($input,"<textarea",$currentPosition);
        if($startOfNextTextarea===false){
            // no textarea tag remaining:
            // strip ws from remaining input, append to $returnValue and done!
            $bufferToStrip=substr($input,$currentPosition);
            $temp=stripBuffer($bufferToStrip);
            $returnValue.=$temp;
            $currentPosition=$endPosition; // to cause the function to return
        }
        else{
            // <textarea> found
            // strip ws from input in the range [current_position, start_of_textarea)
            $bufferToStrip=substr($input,$currentPosition,$startOfNextTextarea-$currentPosition);
            // append to return value
            $temp=stripBuffer($bufferToStrip);
            $returnValue.=$temp;
            $endOfNextTextarea=stripos($input,"</textarea>",$startOfNextTextarea);
            // get contents of <textarea>, append to return value without stripping ws
            $temp=substr($input,$startOfNextTextarea,$endOfNextTextarea-$startOfNextTextarea);
            $returnValue.=$temp;
            // continue looking for textareas after the end of this one
            $currentPosition=$endOfNextTextarea;
        }
    }
    return $returnValue;
}

我承认，如果您不能“直观地”告诉它要做什么，这将非常困难，因为<textarea>标记的内容在HTML中得到了特殊处理。