php exit handler with forking https://stackoverflow.com/questions/49759437/curl-cannot-be-killed-by-a-php-sigint-with-custom-signal-handler/49930999#49930999

phpexit.php

<?php


$pid = pcntl_fork();
if ($pid == -1) {
     die('could not fork');
} else if ($pid) {
     // we are the parent
declare(ticks=1);
//pcntl_async_signals(true);

$shutdownHandler = function () {
    echo 'Exiting';
//    exit();
};

    pcntl_signal(SIGINT, $shutdownHandler);

     pcntl_wait($status); //Protect against Zombie children
} else {
   // we are the child

echo "hanging now";
while (true) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, 'http://blackhole.webpagetest.org');
    curl_exec($ch);
    curl_close($ch);
}
}