PHP Process Signal Processing

PHP's PCNTL extension provides the function of signal processing, which allows PHP to take over the processing of signals, and signal processing is critical in the development of server-side daemon processes. Pcntl This extension is only available in cli/cgi mode. Not available in mod_php and PHP-FPM. PHP did not connect the pcntl to the PHP-CLI executable in the process of compiling it.

Function Prototypes:

BOOL pcntl_signal(int $signo, callback $handler [, BOOL $restart _syscalls=true])

The first parameter is the signal ID, which can be found here http://swoole.sinaapp.com/archives/124

The second parameter is the PHP function of the callback when the signal occurs.

The third parameter is whether the restart is re-registered for this signal. If this parameter is false, then this signal is only registered for processing once.

<?phpSignal processing requires registration ticks to take effect, it is important to notePHP5.4 and above are no longer dependent on ticks.DECLARE (Ticks=1);functionSig_handler ($Signo) {Switch ($Signo) {CaseSIGUSR1:echo  "sigusr1\n"; case sigusr2:echo  " Sigusr2\n "; break;default:echo pcntl_signal (SIGUSR1,  "Sig_handler"); Span class= "function call" >pcntl_signal (SIGUSR2,  "Sig_handler"); posix_kill (posix_getpid (), SIGUSR1); Span class= "function call" >posix_kill (posix_getpid (), SIGUSR2) ; ?>           

PHP Process Signal Processing