Scheduling PHP Scripts on Linux and Windows: Cron, Batch Files, and ignore_user_abort Loops

Linux Server: Using CronTab to Schedule PHP

On Linux, the command‑line tool crontab -e opens the crontab file in vi; press i to enter insert mode and add a new line for each scheduled task.

Example entry:

00 * * * * curl https://www.yourdomain.com/script.php

The five fields represent minute, hour, day of month, month, and day of week respectively. For instance:

00 */2 * * * /usr/local/bin/php /home/www/script.php

This runs /usr/local/bin/php /home/www/script.php every two hours at minute 00, executing the script directly on the server for higher efficiency.

Windows Server: Using a BAT File to Schedule PHP

Create a cron.bat file containing the command to run PHP:

D:\php\php.exe -q D:\website\test.php

Save the file, then open the Windows Task Scheduler (Start → Control Panel → Task Scheduler → Create Basic Task) and configure the trigger, credentials, and action to run cron.bat . The task will execute the PHP script at the scheduled times.

Using ignore_user_abort(true) and a Sleep Loop

Place the following code at the beginning of a PHP file to keep it running even if the client disconnects:

<?php

ignore_user_abort(true);

set_time_limit(0);

date_default_timezone_set("PRC");

$run_time = strtotime("+1 day"); // first execution tomorrow

$interval = 3600*12; // every 12 hours

if (!file_exists(dirname(__FILE__)."/cron-run")) exit();

do {

if (!file_exists(dirname(__FILE__)."/cron-switch")) break; // switch file to stop

$gmt_time = microtime(true);

$loop = isset($loop) && $loop ? $loop : $run_time - $gmt_time;

$loop = $loop > 0 ? $loop : 0;

if (!$loop) break;

sleep($loop);

// execute task here

@unlink(dirname(__FILE__).'/cron-run');

$loop = $interval;

} while (true);

The loop runs until a cron-switch file is removed, allowing you to stop the task safely.

Non‑Blocking Requests with fsockopen

To trigger the scheduled PHP script without waiting for a response, use the following helper function:

// Remote request (no content retrieval) function _sock($url) {

$host = parse_url($url, PHP_URL_HOST);

$port = parse_url($url, PHP_URL_PORT) ?: 80;

$scheme = parse_url($url, PHP_URL_SCHEME);

$path = parse_url($url, PHP_URL_PATH);

$query = parse_url($url, PHP_URL_QUERY);

if ($query) $path .= "?".$query;

if ($scheme == "https") $host = "ssl://".$host;

$fp = fsockopen($host, $port, $error_code, $error_msg, 1);

if (!$fp) return array("error_code"=>$error_code, "error_msg"=>$error_msg);

else {

stream_set_blocking($fp, true);

stream_set_timeout($fp, 1);

$header = "GET $path HTTP/1.1\r\n";

$header .= "Host: $host\r\n";

$header .= "Connection: close\r\n\r\n";

fwrite($fp, $header);
usleep(1000); // small delay for nginx compatibility
fclose($fp);
return array("error_code"=>0);
}
}
_sock("www.yourdomain.com/script.php");
Calling
_sock
sends a fire‑and‑forget request to the PHP script, activating the background task without blocking the user’s page.
For larger systems, task lists are often stored in a database (e.g., WordPress), but you can also manage them with simple file‑based approaches such as the open‑source
php‑cron
project on GitHub.