Working with something that needs a shell access, like working with awesome imagick function and stuck with sh: convert: command not found

The thing is it works when the same command that run from php script is run on the command line.
It is a path issue.

exec("convert soruce.ext converted.ext", $report);

Here the report would tell how it goes and it will get back with the news

sh: convert: command not found

Now do

which convert

To get the full path of the command and use it

exec("full-path-to-convert source.ext converted.ext", report);

The above would work for any command that creates related problems.