Execute php script from php page asynchronously in WINDOWS system

Question

I have been searching through several questions similar to this but i have found no answer suitable for me, especially for Windows system. I have installed PHP and Apache ona Windows machine. I have an app which calls Page1.php. In Page1 i execute some code and at an specific point I would like to launchanother php script, let`s call it Script.php asynchronously. I don´t need to pass any parameter to this second script -if I could it could be helpful but it´s not mandatory- and I don´t need to wait for the script to finish beacuse i don´t want to retain the communication with the user, since script makes a lot of operations with files and it can last quite a long time. I have seen and tried answers based on exec, popen, shell, system and so on...but I haven´t found the right one for me, maybe because I´m working on Windows.These have beeen some of the solutions I have tried without anysuccess:

exec('php script.php &> /dev/null &');
shell_exec('php script.php &> /dev/null &');
system('php script.php &> /dev/null &');
php script.php &> /dev/null &`

The schema could be more or less as follows:

PAGE1.PHP

<?php
echo "Hello World";
echo "\n";
....
if ($var>$var2) {
    HERE CALL SCRIPT.PHP ASYNC
}
...
?>

SCRIPT.php

<?php
...
...
?>

Did you try that command at the command line? It produces a syntax error, because &> doesn't mean anything in Windows. (Neither does /dev/null.) — Harry Johnston
– Harry Johnston, Commented Nov 12, 2014 at 0:54

Community · Accepted Answer · 2017-05-23 12:30:55Z

2

Copied from php.net's comments on exec's page:

This will execute $cmd in the background (no cmd window) without PHP waiting for it to finish, on both Windows and Unix.

<?php 
function execInBackground($cmd) { 
    if (substr(php_uname(), 0, 7) == "Windows"){ 
        pclose(popen("start /B ". $cmd, "r"));  
    } 
    else { 
        exec($cmd . " > /dev/null &");   
    } 
} 
?>

I did not test this myself, but it was a similar direction to what I was thinking of. You can also look at this stackoverflow question for more details (might help).

edited May 23, 2017 at 12:30

CommunityBot

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answered Nov 12, 2014 at 0:07

iLot

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4 Comments

user3188554 Over a year ago

But in this approach how I execute Script.php. As i can see from your code it only executes command line, is that right?

iLot Over a year ago

@user3188554 The command can be used to start another script. Look at the "Command Line PHP on Microsoft Windows" page of php.net to find out how to do it on your machine.

user3188554 Over a year ago

OK, I almost got it but it is not still working, I guess the problem is the account permissions. Maybe the account needs to have admin privileges, does that make sense?

iLot Over a year ago

@user3188554 it does. You can try running your script using the same command you use here and see if it works. If it doesn't- try running cmd as administrator and try again- if it works, you should make sure you always execute this as an administrator. If that is not the issue, you can try using WScript.Shell as written in this php.net comment (I would update my answer accordingly if it works).

Kevin Kopf · Accepted Answer · 2014-11-12 00:06:37Z

0

What you call "asynchronous" is not actually asynchronous. You make a call for another script to execute in case $var > $var2 and it's called an if-statement.

If your script has to be in another file, you may try using include, include_once or require or require_once:

if ($var > $var2) {
    include "Script.php";
}

The rest depends on Script.php.

answered Nov 12, 2014 at 0:06

Kevin Kopf

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2 Comments

Harry Johnston Over a year ago

The OP wants to know how to call another script asynchronously. The fact that he wants this to happen inside an if-statement is just an irrelevant detail.

user3188554 Over a year ago

Hi Harry, that is the point. The if statement is completely irrelevant. I need to execute script.php without Page1.php being waiting for it to finish to continue its own line of execution.

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