php-pcntlHow to use PCNTL signals in PHP?

PCNTL signals are a way to handle events in PHP. They can be used to catch signals sent to the script from the operating system.

Example code

<?php

declare(ticks = 1);

// Signal handler function
function signal_handler($signal) {
    switch($signal) {
        case SIGTERM:
            // handle shutdown tasks
            exit;
        case SIGKILL:
            // handle shutdown tasks
            exit;
        default:
            // handle all other signals
    }
}

// Setup signal handlers
pcntl_signal(SIGTERM, "signal_handler");
pcntl_signal(SIGKILL, "signal_handler");

// Rest of your code

?>

The code above sets up signal handlers for the SIGTERM and SIGKILL signals. The pcntl_signal() function takes two parameters, the signal to be handled and the name of the signal handler function. The declare(ticks = 1) statement tells PHP to check for signals after every statement.

Code explanation

• declare(ticks = 1): tells PHP to check for signals after every statement
• pcntl_signal(): takes two parameters, the signal to be handled and the name of the signal handler function
• signal_handler(): the signal handler function which handles the signals

Helpful links

• PHP PCNTL Manual
• PHP PCNTL Signal Handling

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