header("Cache-Control:no-cache,must-revalidate");
$handle = popen('svn --version','r'); 
$read = stream_get_contents($handle);
echo "<pre>";
printf($read);
echo "</pre>"; 
pclose($handle);

代码来源张宴N年前的博客： http://blog.s135.com/post/371/2/1/
这样在浏览器上访问输出的结果OK

svn, version 1.6.11 (r934486) compiled Apr 11 2013, 16:13:51

Copyright (C) 2000-2009 CollabNet. Subversion is open source software,
see http://subversion.tigris.org/ This product includes software
developed by CollabNet ( http://www.Collab.Net/ ).

The following repository access (RA) modules are available:

• ra_neon : Module for accessing a repository via WebDAV protocol using Neon.
  
  
  • handles 'http' scheme
  • handles 'https' scheme
• ra_svn : Module for accessing a repository using the svn network protocol.
  
  
  • with Cyrus SASL authentication
  • handles 'svn' scheme
• ra_local : Module for accessing a repository on local disk.
  
  
  • handles 'file' scheme

把第二行代码换成
popen('svn up --username zmk --password 123456 /home/wwwroot/test/','r');
就不行了(什么都不输出)。
如果把第二行代码换成
popen('svn up --username zmk --password 123456 /home/wwwroot/xxx/','r');
这里的 /home/wwwroot/xxx 是错误的地址,最终页面会输出
Skipped '/home/wwwroot/xxx'

求linux大神看看

现在这个脚本的用户组和用户是www:www