If system("convert -version") does nothing, it is probably erroring out.
Mess around with exec and using 2>&1 to try to get the error message.
It's going to boil down to paths and permissions.
The PHP user probably doesn't have convert in $PATH.
Use a FULL PATH for system/exec calls for *any* path, and within *any* script being called.
Anything else is just a time bomb waiting to blow up on you.
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