PHP exec()

What is ledson.sh supposed to do?  Does it put some output somewhere?  If so, you can look at the output.

If ledson.sh takes a while to run, your PHP script might need to sleep() for a while or otherwise synchronize itself with the other script.
http://us3.php.net/manual/en/function.sleep.php

Afterthought, but hopefully a useful one.  Here is a book that can help you get a foundation in how PHP and MySQL (or MySQLi) work together.  Very  much worth the investment of a  month of your time to study it!  It has great explanations and examples and it comes with a downloadable code library that you can copy and modify for your own use.  Now in its fifth printing, it has been a permanent part of my professional library since Edition One.
http://www.sitepoint.com/books/phpmysql5/

best regards, ~Ray

greetings   IanGP, , u may have considered this already, but u said u were new to PHP, - Many php security settings have any OS calls like -
exec( )
shell_exec( )
Disabled, and may not even issue a warning, or exception if they are called,
usually if you look at the -
phpinfo();
u can see any and all of the disabled commands and options, or ask your server support people.

Thanks, I'll try the suggestions and let you all know.
Regards
Ian

OK....

@fosiul01 - ledson.sh is owned by www-data and I've done chmod 775 ledson.sh and I can run it (and ledsoff.sh).

@Ray. I'm working on a Raspberry Pi, playing with the GPIO's
ledson.sh is a little script to switch on LEDs  & Thanks, purchased the ebook.....

@slick812 - tried adding disable_functions = "" to php.ini and commented out the line altogether

@insoftservice and Ray - I have no parameters required for ledson.sh. really just want to toggle on and off.

Thanks
Ian

Hi,
Still battling with this....
But for the interim I'll use file_put-contents It at least lets me control the output file.
Cheers.
Ian

OK, not sure this will help, but linux can have a "what to call to do the job" setting problem, I ran into this BIG TIME when trying to call anything from system in CRON timed run of PHP scripts, sometimes to get the CRON to run PHP, you have to precede the cron call with PHP, so the PHP engine will process and run the PHP script, I remember having to precede a shell script call (work.sh) with the BASH, so the linux now working in PHP mode, would run that script in the shell script engine, , sorry I can not be more specific to your problem, but I am not a Linux command knowledge guy, and I got help in order to get those CRON php runs to work. You may also need to do a full path to the BASH engine, or not?
Have you tried to run any non shell script, linux executables like whois, from exec or shell_exec call from php, did they work?

hi did u tried with my comments and later tried to do shell script.
If i am not wrong ur shell script was not working proper right in php ?

please elaborate little more.
ini_set('display_errors','on');
and let us know the issue , does redirection work properly
header('Location: http://url.url/leds.php');exit;

Thanks All.
Although I haven't fully gotten to the bottom of the problem, your insights got me in the right direction.
Thanks
Ian