Catch mxmlc output with php

Dear All,

Thanks in advance.

I am compiling an .as file with mxmlc on the fly using PHP.

CODE:

exec(“mxmlc example.as”,$retval,$success);
print_r($retval);

The output of above is just:
Array ( [0] => Loading configuration file /site/fsdk/frameworks/flex-config.xml )

Whereas actually, when I execute “mxmlc example.as” (From command line linux) I get many errors as:

public class My_273860 extends Sprite asdfasfasf
^

I want to catch all the errors:

Please help,
Thanks.