按照网络上的文章：
  #############################################################
  先下载[url="http://pecl.php.net/get/vld-0.8.0.tgz"]http://pecl.php.net/get/vld-0.8.0.tgz[/url]
  
  执行
  #tar -xzf vld-0.8.0.tgz //解压
  #mv vld-0.8.0 vld //重命名
  #cd -R vld ../php-4.3.8/ext //拷贝vld目录到php的解压目录下的ext中
  #cd php-4.3.8
  #rm configure //删除configure,因为下面的buildconf会重新生成新的configure
  #./buildconf //如果出现错误,就按提示加上相应的参数.
  #./configure --with-mysql --with-apxs2=/usr/www/bin/apxs --enable-vld 重新检查php
  #make 编译
  #make install 安装
  
  服务器必须先安装ZendOptimizer
  运行Zend后的文件,查看源代码就可以看到了.先下载[url="http://pecl.php.net/get/vld-0.8.0.tgz"]http://pecl.php.net/get/vld-0.8.0.tgz[/url]
  
  执行
  #tar -xzf vld-0.8.0.tgz //解压
  #mv vld-0.8.0 vld //重命名
  #cp -R vld ../php-4.3.8/ext //拷贝vld目录到php的解压目录下的ext中
  #cd php-4.3.8
  #rm configure //删除configure,因为下面的buildconf会重新生成新的configure
  #./buildconf //如果出现错误,就按提示加上相应的参数.
  #./configure --with-mysql --with-apxs2=/usr/www/bin/apxs --enable-vld 重新检查php
  #make 编译
  #make install 安装
  
  服务器必须先安装ZendOptimizer
  运行Zend后的文件,查看源代码就可以看到了.
  #####################################################
  
  前面安装配置都通过了
  可最后一步却不知道怎么办了
  怎么样运行zend后的文件呢？
  IE里运行肯定是不行的
  是不是用ZendOptimizer运行zend后的文件？
   这是PHP信息页面里显示的APACHE配置信息，VLD已经配置上去了
  './configure' '--with-apxs2=/usr/local/apache/bin/apxs' '--disable-debug' '--enable-ftp' '--enable-inline-optimization' '--enable-safe-mode' '--enable-track-vars' '--enable-tarns-sid' '--enable-xml' '--with-mysql' '--with-xml' '--enable-magic-quotes' '--with-system-regex' '--enable-sockets' '--with-jpeg-dir=/usr/local' '--with-zlib-dir=/usr/local' '--with-png-dir=/usr/local' '--with-gd=/usr/local' '--with-xpm-dir=/usr/local' '--with-freetype-dir=/usr/local' '--enable-vld'
  我的php信息页面里显示VLD已经启用了
  vld support enabled
  
  可是怎么打开加密的PHP文件还是不懂？

偶试了，怎么反编译的是这些玩意？
[root@york htdocs]# php -d vld.active=1 index.php3
filename:       /usr/local/apache/htdocs/index.php3
function name:  (null)
number of ops:  4
line     #  op                           fetch          ext  operands
-------------------------------------------------------------------------------
   3     0  ECHO                                                 'Zend%00%0B2000112001%00%021%00%051143%00%052469%00x%F9%0A%9F2%0C%9DX%CDn%DBF%10%16P%A3%B1u%F2%23%B0%BC%88JD%8A%CB_1%12%5D%C8V%9C%BApk%14R%E1c%B1%22W%12%11%FE%85%5CZV%82%3CM%80%1E%8A%1E%1A%B4%3D%04%28%1A%B4%97%A2%0FP%A0%E8%3B%F4%1D%3A%CB%1FIT%2C%07%28%60%9B%DC%9D%DD%99%E5%CE73%DF%98yxBp%C0E%A3%917Ym%40%0E%D5%DE%CD%82%60%25a%D7M%CA%A2%0D%8D%90%AA%97%8D%90%D2%B8%A8%21%97%29%F2B%C7%CF%5C%22%C5%8B%F8%B0%60%7B%C5%8A%82%2CW%2B%0F%90%A94%06%2C%A5%9C4%07%0B%82%5Dx%04%84B%ED%A34%16%C9%F3%CC%BB%B1%F93%C8%17%24%A4%E2%25%0E%E7%19%9E%13%1E%EA%60%3Ec%F3%2F%16%A2%13%F2%F7m%9A%40%ED%DC%DA%40%C9-%ED2%7B%7D%CEY0%17R%7B%3EUT%A40%25%D4%A3p%FB%3F%FF%F1%FB%2F%3F%FE%F9%F6%DB%D7%DF%BF%FD%FB%CD_o%7E%FD%E9%87w%FF%80grY%B3%3C%3D%FBk6%BE%2A%1D%7E%BC%93%E0V%F3%E9%A2%60%AC%87%B56%8E%E5%5E%97%F8%84%12n%96D%01G%BFqp%E2%12%D7c%2F%0E%90%98%E5%82%24%84%CBR%92%D8%AD%83m%E6%7BX%A7Kuv%DB%5B%B7k%C7%15%0B%DC%DA%DA_%1FRy%BF%D7%60%EB%AD%DD%3C%A76%D2%E7E%7E-%7E%AC2m%A1%1A%C1Ay%DA%02%E1%5D%E8%AF6nnH%AD%E7Fv'
         1  ECHO                                                 '%C9%BF%FD%FB%EE%3Bv%B99u%40%25Q%DA%E8%C9%93%11%AAX%DF%0En%14%86%9BOD%91%1B%40%95%26%0E%D0%15%D7v%FC%28%25%40%01%C1%E36%8F%E3%D8%F7%1CL%BD%28%EC%DE%8A%91O%8Au%00%05%1F%A7%29%AC%E6%1D%1F%1E%8F%B1%3B%ED%F5dl%88no6%13%11rf%A2%A5%9A%A6%28%CB%18%CB%B2%3A51B%FC%09%D7%1C%40%C0Ch%848+%0C%5CA%80C%97%E7r%92%0Fcf%99%87%F8-%8C%9C%88%22%A0i%E7t%FC5%99%9E%26%D1%12%9C%CBsK%CF%A5%0B%5B%E6%16%C4%9B%2F%28%BC%ACOuv9%BE%18%3D%EE%F5t%E3%DC2%90%A8j%F2%10N5%92%C5%A1e%9C%C2%A9%CEd%ED%7Cd%CA%FA0Gle%90c%167%D8dL%AC%7Ea%F0%3BH%EF%5Bp%A0%1Ar%C3I%BC%98r%97%C3%2F%9F%7E%3D%7C%FA%C4%E6%3F%C77x%9CO%82%B1Y%16%3A%EC%3A%B9%28%26%E1%D2%0B%05%A8%C2%1D%2Fns%2F%9BG78%E1%E2%28%ED%17o%EC%09%23%CE%E6%BCX%82%0F%A3%17%A1Kn%AFf%02%2F%F1%EDG%A8yT%8A%D2l%9A%D2D%80%A5%EDb%E3%F8%F2j%F8%C55%08A%BD%1B-%25fI%E0%F9%0E%3F%7E%B6%82%E8wA%8A%BD%F0%3A%17%F2%8F%D2N%0B%C8%B2%F7%82%E5L%7BE%D2NJ1%CDR%3B%8C%3A%A9%93D%BE%3F%85%00g%82%16%A8%F7f%9C%E0FN%16%40%1A%90%B0%EF%B7%E1%D4G%85%3D%29%88n%C8%24%12%E4%8E%DC%DEL%E6%AA%D94%E8%22%24%94'
   5     2  ECHO                                                 'r%97u%CAA%E17Qa%1B%5E5%AB-%7ET%00%CE%86%9BYO%CE%C0h%2A%B4%9B%AF%C0%5Bi%7E%975OA%85%D0%B7%9B+%D4%D8%16%AA%AC1D%EFE%FEG%AA%09%EE%2C%94U%DEhu%E1%D3%B2%AE%C7%AE%9Ae%DDO%E1%10v%A9%A4WWr%5C%F4%E4%F7Y%80xmuZ%FB%B6%EB%1F%DA%CE%22%B6%D5%EE%AF%BF%B8%5C%DB%BE%A3%EB%5B%7F%E9y5%AC%E7%91B%B8%1B%FE%40P%07%DD%B2%60%E4%816%8D%DC%15%17%85%7E%84%21%88X%19%AF.%BE_b%09R%FD%05%14%81%04BVh%15%A9B%3A%83%14%F1Lh%C3%97%22%19%8E%CB%17q%F4%7F%14nCK%DAD%BA%F4%E4%968%D7%A7%82%A6w%D0%96%19%80%02S_%9A%CB_%CB%99mh%00%81%7FXa%82%DDA%1D%1B+%DD%0F%1CM%D9%E3%17M%5D%03%A7B%AB%94%F7%99%7B%E1%03%AA%F6%C3g%9F%9D%0D%7C%EE%DA%AE%7Fh%3B%2B%07%AD%3Az4%E5%1E%F4%80p%3Fz%B4%DD%E2%01%95%7B%90s%80%93%EDUF%A3%1A%D6I%EBZ%5Cr-%23%2FG%F31%03%86%17%CE%A1%0E%1C%F5%14%D32t%13%96%E4%A5%F3%81.%23%C32%0A2%F6%B1b%22%E8%04%D9%FF%19%AE%F0x%95R%12%8C%09%CD%E2%23%C3%B2%2CS%D7%95F%D1%CF%3C%D0%91%8C4%8D%15%CD%BCo%F8%ECj%3Ci%22Y%D3T%03%99Fc%5D%D1%FF%03%D1W%09%2C'
         3  RETURN                                               1

Zend
    2000112001111432469x?
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                                                    2霰b"???x??外#貌,S?F严<??图o?j<i"Y釉?c]?炎      ,[root@york htdocs]#