shell_exec() and exec() Doesn't Show The Output

Question

shell_exec():

I'm doing a PHP site that uses a shell_exec() function like this:

$file = "upload/" . $_FILES["file"]["name"];

$output = shell_exec("leaf $file");
echo "<pre>$output</pre>";

Where leaf is a program that is located in the same directory of my script, but when I tried to run this script on the server, I just got nothing.

---

exec():

If I try by using exec() like this:

exec("sh " . getcwd() . "leaf -h", &$output);
echo "<pre>";
print_r(&$output);
echo "</pre>";

I got this:

Array
(
)

If I do the same thing, but using echo instead of print_r, I got only this: Array

What I can do?

Answer 1

Have you tried to use the full path with your "leaf" reference?

$output = shell_exec("/var/local/leaf $file");