<?php
/*
* This demo show you how to synchronize long-running tasks with your web application.
*
* Roadmap :
* - When you come to that page, you are invited to click on a "Start" button to launch a "long-running task".
* - By clicking "Start", you exec() a simulation of long-running task that only sets progress percentages every 1sec
* - When refreshing, you can see progression of your task using a simple echo $sync->percentage
*
* Should be run using a web browser
*/
require("Sync.php");
$sync = new Sync("/tmp/demo.sync");
// Child process
if (php_sapi_name() === 'cli')
{
// Simulates a long-running task
for ($i = 0; ($i <= 100); $i++)
{
$sync->percentage = $i;
sleep(1);
}
$sync->percentage = null;
die();
}
// Button was clicked
if (isset($_POST['button']))
{
// Execute this file with PHP Cli as a daemon (to launch long-running task)
// See http://stackoverflow.com/a/12341511/731138
exec(sprintf("/usr/bin/php %s > /dev/null 2>&1 &", escapeshellarg($_SERVER['SCRIPT_FILENAME'])));
// Gives time for the demo to change percentage in our synchronized variable
sleep(1);
// Avoid that refresh button asks for form repost
header(sprintf("Location: %s", filter_var($_SERVER['PHP_SELF'], FILTER_SANITIZE_STRING)));
die();
}
if (is_null($sync->percentage))
{
// Long-running task not executed, displaying start button
$form = <<< 'HTML_END'
<form action="%s" method="post">
To start long-running task, click on the following button:
<input name="button" type="submit" value="Start" />
</form>
HTML_END;
echo sprintf($form, filter_var($_SERVER['PHP_SELF'], FILTER_SANITIZE_STRING));
}
else
{
// Long-running task executed, displaying progression
echo sprintf("Program still in progress: %d%% <br/>", $sync->percentage);
echo '<a href="#" onclick="window.location.reload(); return false;">Refresh page</a>';
}
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