title: shell_exec with "svnadmin verify" returns nothing
body: <p>I want to give output of svnadmin verify command from shell_exec()</p>
  
  <pre>
  var_dump(shell_exec('/usr/bin/svnadmin verify /Users/osman/Desktop/SVN/name'));
  </pre>
  
  <p>But it returns 'null'. 
  How can i access the response of svnadmin verify ?</p>
  
  <p>Im working with PHP 5.3.2 on Mac OS X Snow Leopard</p>