困难的部分是试图找出stripwhitespace（）函数的作用。 stripbuffer（）是相当简单的，但我现在一直在盯着这段代码试图破译它，但无济于事。隐秘的变量名称和缺乏评论也没有多大帮助。由于此网站上的垃圾邮件防护，我还必须从信用中删除一些超链接
<?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 */
$bff=str_replace(" "," ",$bff);
$bff=str_replace(" "," ",$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 $bff;
}
ob_start("stripwhitespace");
?>答案 0 :(得分：2)
在我看来，它好像在textarea之前和textarea之后处理所有内容，但它只留下textarea的内容。
虽然这段代码可能有些有趣，但PHP在快速字符串操作方面却出了名，而所有str_replace调用都是一个坏主意。
我预测你会在网络服务器上使用gzip / deflate在发送之前压缩脚本输出，从而获得更好的性能。
答案 1 :(得分：1)
这绝对是一团糟，但似乎它从字符串中删除了不必要的空白区域，除了在textareas中。
答案 2 :(得分：0)
很明显stripBuffer做了什么：它试图从输入中删除所有空格。
stripwhitespace的工作原理如下：
function stripwhitespace($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，如果你不能“直观地”告诉它想要做什么，那将会更加困难，因为<textarea>标签的内容采用HTML进行特殊处理。
答案 3 :(得分：0)
伪代码（ish）
bff is the initial buffer
pzcr is the current start
pzed is the current end
rst will have the filtered text appended to it.
while the current start is before the end
t_pos_start is first position of the textarea (after current start)
if there is no text area found
bffstp becomes the substring of the buffer starting at pzcr
temp is buffer stripped.
append temp to rst
set the current start to the current end.
else
set bffstp to the substr between the start and the start of the textarea tag
temp is buffer stripped.
append temp to rst
skip the textarea
temp will be the substr from the start of the text area to the closing text area tag.
append temp (unfiltered) to rst.
set the next start to the end of the textarea (at the start of its closing tag).
end the if
end the while
return the appended buffer (rst)
嗯 - 作为一个html压缩器，这段代码本身实际上是臃肿的，也很难阅读。正常使用的正则表达式应该能够更好地完成这项工作。