Enable/disable asynchronous signal handling or return the old setting
Description
boolpcntl_async_signals(boolnull$enable = 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.
Parameters
enable
Whether asynchronous signal handling should be enabled.
Return Values
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.