keep-proccess-running-in-background.php

<?php

// Preparing response data.
$response = json_encode([
    'success' => true, 
    'time' => date('Y-m-d H:i:s')
]);

// Keep process running after
// connection closed by the browser.
ignore_user_abort(true);

// Kirim header sebagai signal agar
// browser menampilkan data dan browser langsung
// menutup koneksi.
header('Content-Type: application/json');
header('Connection: close');
header('Keep-Alive: timeout=0, max=0');
header('Content-Length: '.mb_strlen($response));
echo $response;
ob_flush();
flush();

// Now this script is disconnected from browser
// but proccess still active.
// Let's run the code behind the scenes
sleep(10); // eg. request REST API