pcntl_async_signals Enable/disable asynchronous signal handling or return the old setting &reftitle.description; boolpcntl_async_signals boolnullenable&null; If the enable parameter is &null;, pcntl_async_signals returns whether asynchronous signal handling is enabled. Otherwise, asynchronous signal handling is enabled or disabled. &reftitle.parameters; enable Whether asynchronous signal handling should be enabled. &reftitle.returnvalues; When used as getter (enable parameter is &null;) it returns whether asynchronous signal handling is enabled. When used as setter (enable parameter is not &null;), it returns whether asynchronous signal handling was enabled before the function call. &reftitle.changelog; &Version; &Description; 8.0.0 enable is nullable now. &reftitle.seealso; declare