PHP system commands

[shamilton]

I am developing a web application and need to check diskspace from the web application before allowing a user to upload files. i tried using system("df -h")
and nohing is being displayed in the browser. how can i get the output of system commands displayed in the browser

[lazzerous]

try this:

$readout = system("df -h", $returnval);

echo "Return Value: $returnval  --  (if greater than 0, you have a problem)<br>\n";
	echo "Last Line of Output: $last_line<br><br>\n";

[shamilton]

here is the output from my browser
Return Value: 127 Last Line of Output:
when i use the getenv function the environment variable is displayed. How can i get the system command working?