How Can I Get Real-Time Process Output and Gracefully Kill Processes in PHP?

Real-Time Process Output in PHP

Running processes that output in real-time on a web page can enhance user experience and provide immediate feedback. In PHP, it's possible to achieve this using the proc_open() function.

Obtaining Real-Time Output

To obtain real-time output from a process, use proc_open() as follows:

$cmd = "ping 127.0.0.1";
$descriptorspec = array(
    0 => array("pipe", "r"),
    1 => array("pipe", "w"),
    2 => array("pipe", "w")
);

$process = proc_open($cmd, $descriptorspec, $pipes, realpath('./'), array());

// Display output
echo "<pre class="brush:php;toolbar:false">";
if (is_resource($process)) {
    while ($s = fgets($pipes[1])) {
        print $s;
        flush();
    }
}
echo "

";

In this code, the ping process's output is continuously read from the pipe $pipes[1] and displayed.

Killing the Process on Page Exit

To kill a process when a page is exited, use the following code:

register_shutdown_function(function() use ($process) {
    proc_terminate($process);
    // Wait for process to terminate gracefully
    proc_close($process);
});

This code registers a shutdown function that terminates a process when the script exits. It also gracefully waits for the process to finish before closing it.

By leveraging proc_open() and register_shutdown_function(), you can execute processes and obtain their real-time output in PHP. When the page exits, the process is automatically terminated to prevent any lingering system resources.

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