The behaviour of these functions is affected by settings in php.ini.
| Name | Default | Changeable | Changelog | 
|---|---|---|---|
| uopz.disable | "0" | PHP_INI_SYSTEM | Available as of uopz 5.0.2 | 
| uopz.exit | "0" | PHP_INI_SYSTEM | Available as of uopz 6.0.1 | 
Here's a short explanation of the configuration directives.
uopz.disable
      bool
     If enabled, uopz should stop having any effect on the engine.
uopz.exit
      bool
     Whether to allow the execution of exit opcodes or not. This setting can be overridden during runtime by calling uopz_allow_exit().