exec() with Mac open command

[Billiken]

I want to do something like the following:

exec('open /Applications/Safari.app');

 

 

I can run exec on other commands like:

 

$output = exec('ls -ll);
echo $output;

 

And I can run the open command via Terminal, but I can't seem to run the open command via a PHP page using exec().

 

I've tried the permissions of the .app file at 777 and the open binary at 777.

 

Any suggestions?