How do I catch a KILL or HUP or User Abort signal?

Perl:

$SIG{$_} = \&safe_exit for qw( INT TERM HUP );

SIGKILL cannot be caught. It is not sent to the process.

%SIG is documented in perlvar. See also perlipc

PHP uses pcntl_signal to register a signal handler, so something like this:

declare(ticks = 1);

function sig_handler($sig) {
    switch($sig) {
        case SIGINT:
        # one branch for signal...
    }
}

pcntl_signal(SIGINT,  "sig_handler");
pcntl_signal(SIGTERM, "sig_handler");
pcntl_signal(SIGHUP,  "sig_handler");
# Nothing for SIGKILL as it won't work and trying to will give you a warning.