<?php ob_start();//打开缓冲区 ?> php页面的全部输出 <? $content = ob_get_contents();//取得php页面输出的全部内容 $fp = fopen("output00001.html", "w"); //创建一个文件,并打开,准备写入 fwrite($fp, $content); //把php页面的内容全部写入output00001.html,然后…… fclose($fp); ?>
二、 捕捉输出 以上的Example 4.是一种最简单的情况,你还可以在写入前对$content进行操作…… 你可以设法捕捉一些关键字,然后去对它进行再处理,比如Example 3.所述的PHP语法高亮显示。个人认为,这个功能是此函数最大的精华所在,它可以解决各种各样的问题,但需要你有足够的想象力…… Example 5.
<? Function run_code($code) { If($code) { ob_start(); eval($code); $contents = ob_get_contents(); ob_end_clean(); }else { echo "错误!没有输出"; exit(); } return $contents; }
以上这个例子的用途不是很大,不过很典型$code的本身就是一个含有变量的输出页面,而这个例子用eval把$code中的变量替换,然后对输出结果再进行输出捕捉,再一次的进行处理……
Example 6. 加快传输
<? /* ** Title.........: PHP4 HTTP Compression Speeds up the Web ** Version.......: 1.20 ** Author........: catoc <[email]catoc@163.net[/email]> ** Filename......: gzdoc.php ** Last changed..: 18/10/2000 ** Requirments...: PHP4 >= 4.0.1 ** PHP was configured with --with-zlib[=DIR] ** Notes.........: Dynamic Content Acceleration compresses ** the data transmission data on the fly ** code by sun jin hu (catoc) <[email]catoc@163.net[/email]> ** Most newer browsers since 1998/1999 have ** been equipped to support the HTTP 1.1 ** standard known as "content-encoding." ** Essentially the browser indicates to the ** server that it can accept "content encoding" ** and if the server is capable it will then ** compress the data and transmit it. The ** browser decompresses it and then renders ** the page. ** ** Modified by John Lim ([email]jlim@natsoft.com.my[/email]) ** based on ideas by Sandy McArthur, Jr ** Usage........: ** No space before the beginning of the first '<?' tag. ** ------------Start of file---------- ** |<? ** | include('gzdoc.php'); ** |? > ** |<HTML> ** |... the page ... ** |</HTML> ** |<? ** | gzdocout(); ** |? > ** -------------End of file----------- */ ob_start(); ob_implicit_flush(0); function CheckCanGzip(){ global $HTTP_ACCEPT_ENCODING; if (headers_sent() || connection_timeout() || connection_aborted()){ return 0; } if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false) return "x-gzip"; if (strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false) return "gzip"; return 0; } /* $level = compression level 0-9, 0=none, 9=max */ function GzDocOut($level=1,$debug=0){ $ENCODING = CheckCanGzip(); if ($ENCODING){ print "n<!-- Use compress $ENCODING -->n"; $Contents = ob_get_contents(); ob_end_clean(); if ($debug){ $s = "<p>Not compress length: ".strlen($Contents); $s .= " Compressed length: ".strlen(gzcompress($Contents,$level)); $Contents .= $s; } header("Content-Encoding: $ENCODING"); print "x1fx8bx08x00x00x00x00x00"; $Size = strlen($Contents); $Crc = crc32($Contents); $Contents = gzcompress($Contents,$level); $Contents = substr($Contents, 0, strlen($Contents) - 4); print $Contents; print pack('V',$Crc); print pack('V',$Size); exit; }else{ ob_end_flush(); exit; } } ?>
这是catoc的一段很早以前的代码,是在weblogs.com看到的,他利用了zlib的函数,对传输的内容进行了压缩,测试表明,对于10k以上的页面,会产生效果,而且页面越大,效果越明显……
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