return_values PHP

[ktsirig]

I have trouble understanding the meaning of the return_var in PHP.
I read that it is used in order to inform us if a PHP command has been executed.
I use system commands in PHP (like 'system', 'shell_exec' etc) and I can't find anywhere a list of the return_vars.
I mean that 0 is for 'OK, the command was executed'.
What does 1 stand for???
I execute a system command , I don't get any result, and if I ask PHP for the return_var, it says '1'.
Where could I find more info as to what return_var=1 means?

[Tim356]

I haven't used it before, but I have come across it while debugging someone elses code. I believe it's used more for interacting with external programs - as in, you run an external program using php and the return value that that external program outputs is returned to your script in the return_var. That's the best I can come up with - as I said, I've only come across it while looking through someone elses code.

In what context are you using it, studying it?

[Edgee]

I did a quick google on it and here is what i found:

"I believe "1" to be indicative of an error, where "0" is, ALL IS OK. An example being with the intended function of exec.

string exec (string command [, string array [, int return_var]])

You need to test return_val which will be the error condition.

ex.

exec("touch hi",,$err); if ($err) die("Could not create file");"

dont know if it will be of any help to you though.