[Phpwiki-talk] check for "shell_exec" before using it

[Christof M. <cm...@cm...>]

"shell_exec" might have been disabled in the PHP configuration, this
will result in a hard error when trying to use ` (shell_exec), so
check for it.

(btw, there is another use in Units.php, but that can be disabled with
DISABLE_UNITS=1, so didn't bother to patch that one)


Christof

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