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<?php $a = new stdClass; var_dump(call_user_func('call_user_func','exec','id',$a));
Output for git.master, git.master_jit, rfc.property-hooks
Warning: exec(): Argument #2 ($output) must be passed by reference, value given in /in/NrnJm on line 4 Warning: exec(): Unable to fork [id] in /in/NrnJm on line 4 bool(false)

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