i am working on web Payroll project using symfony framework. we have 27000 employees to process every month. when we doing employee payroll process we can not depend on browser request as it is a long time taking process and server time out coming. as a work around we like to execute the php script from the background on linux server. then even browser closed the scripts can excute the background.
what is the best way to do this task please help
More info
we would like to give the pay roll process start button from the web interface when user click on the button pay roll process should start even browser close it should execute until done from the background.
regards
To run in the backgroud do the following steps:
Wrap your php command in a shell script:
**
#!/usr/bin/bash
# set up environment variables, PATH etc. here
php /home/yourapp/yourscript.php
**
Code up a web page/php script to request the start.
In the script you need the line:
system('/home/yourapp/yourscript.sh > scriptlog.txt &'
You probably need an extra link to browse the "scriptlog.txt" file from the web.
There are different ways to handle this problem.
The first way is to execute , startinan shell command in background (and with using nohup if you like) starting from your PHP code. Thats nearly the same think like the first answer in the duplicate question.
The 2nd way is to use PHP PCNTL Feature.
Using PCNTL you can create child processes, which running in background. So it's possible to make an fork and returning to the user: "pay roll process is running - you will get an mail, if the system is ready".
Related
I have a web page with a button, when I click the button I want it to post data to a php file - I'm fine with this bit. The problem is that I want that PHP file to then start a process on the server unrelated to the httpd, so if I close the web page that PHP script will still be running to the end (Its a long running script).
The long running script does various tasks that take a while, it will be writing the progress to a .json file. I have my JavaScript setup on the webpage to read the progress every second and update the progress bars etc... I want it so that even if I close the web page the script will still be running to the end, this way I can come back whenever and check on the progress etc.
I've been reading around and found mostly people are saying to use exec but that isn't working for me (although I am testing on windows under wamp, maybe that is why?)
I have been told that I should either by using a manager process running on the server (not through apache) or to use POSIX signals. I'm not to sure on any of these so any help would be appreciated, be it explanation, code or links to good articles
I'd like the keep the script setup how it is if possible, so I only need to figure out how to start a background process not on the httpd.
I thank you all in advance,
Ben
I found this suggestion in a comment on PHP website.
pclose(popen("start /B ". $cmd, "r"));
I'm having a problem where putty gets regularly disconnected. So, when I run a PHP script from the terminal, it always gets interrupted. The script is supposed to run several hours, so I'm not having any luck with it.
How can I completely run this from the server side? I'm reading about cron jobs, but I'm having a hard time understanding at this time. Is there any alternative to cron for what I need?
I have several script PHP files that need to be run, one by one, or perhaps two at a time. Any ideas?
You don't need to leave it run in a cron job - you can just run the php script inside a screen.
Simply type;
screen php /path/to/myphpscript.php
A screen will continue running even after you disconnect from PuTTY. If you need to check up on it, you can use;
screen -r
To re-attach yourself to this process, and view any output.
You need to prevent the process from terminating when the session disconnects.
Something like this would work:
nohup php myscript.php
You can create a cron job to start the php script periodically based on a list of time tasks. More info. You could also start the task in the background from the console. i.e. php-cgi script.php& this would make the script a background task
Take a look at GNU Screen; it allows you to detach and reattach a session later, which is perfect for long-running scripts. Cron is a good option if you want it to happen in a recurring fashion; one-off batch jobs can be scheduled with something like at. For more intense computing needs, you might want to look into a more full-fledged job scheduling system like TORQUE.
You can run your program in background
php ./yourscript.php &
is it possible to launch a php script in background on the webserver with js and let it run even if you change page or not visit the site at all and then get the current status if you call the php script in a second moment?
This php script will process data for hours and sleep for X seconds/minutes for each loops. If what I asked before is possible how can I even get "echos" from it if php will only generated an output only when the script ends?
Maybe this is not a job for PHP?
thank you
EDIT: on a windows machine with apache
It certainly is possible - I have several scripts that run 24/7 written in PHP. Check out Creating Daemons in PHP. It has good info on how to 'daemonize' a php script so that it will run like a service, and it also covers signal handling.
To get debugging output you would redirect to a log file. Do a search on "unix redirect output" as there is a lot of info available.
In Windows it's not much different from UNIX.
First of all, you need to create a PHP script with a run loop. For example, take a look at this: http://code.google.com/p/php-apns/ . This is a PHP "daemon": the main script, PushMonitor.php, runs forever, because it has an infinite loop. It polls a queue at regular intervals, then execute the actions and then wait. Really simple, actually!
The problem, in your case, is that you want to launch the "daemon" from a PHP script.
You may want to look at this: http://robert.accettura.com/blog/2006/09/14/asynchronous-processing-with-php/ (first example code) . You will execute something like launchBackgroundProcess('php myscript.php') .
Note that on the code there's the "start /b" command (and the "&" at the end of the command for UNIX). That is important, because otherwise your process would be killed when the PHP script of the web page is terminated (children process die after parent dies!).
Also, remember that the "php" executable (cli) must be in your path (so you can execute "php" from the command line).
Since the PHP script of the page launching the background process is going to terminate, you can't directly catch the "echoes" in a simple way. My suggestion is to write all output to a file (or a database etc), and then read the contents from that source when necessary.
So, instead of "echo", you will use file_put_contents() etc.
i start a linux console app from my php5 script, it starts ok but then termintates. I've tried using system(), shell_exec and tried starting as background process but to no avail it starts and then quits.
What i am trying to achieve is from a remote browser start a console app using a php5 script and then it should remain running (just as it would if i started it from a bash shell) , i then want to send commands (from a bash shell it would be keyboard strokes) to the console app from another set of php5 scripts. Hope its clear what i am trying to do.
If anyone could give some info on the best way about doing this, as i think i may have something fundamentally wrong.
I have a Debian Lenny box running apache.The console app is just a simple program that prints to stdout and reads from stdin.
How do you expect to send input to this app? Where is it listening for input?
It simply may only support interactive use, and exit as a result of that. Or, even simpler, it may terminate because it sees that is has no input (nothing piped in or nothing from some file) and since it's not connected to an interactive shell, it has nothing to do. There's no point in waiting for input from a user that doesn't have a way to interact w/ the application.
On every request, PHP starts up, compiles your script and executes it. After execution, the script exists. When the script exits, all of the resources it was using, including file handles, database handles, and pipes to other programs are terminated.
You're going to need to find another way to keep your program open and have PHP communicate with it. Otherwise, every request to your script is going to open a new copy of the program, and then both will exit when the PHP script is complete.
Unfortunately without knowing what the program is, it will be hard to offer suggestions on how to go about doing this.
I am working on a site that require a php script running on a server without any request,
it is a bot script that keeps (not full time but at least once a day) checking client accounts and send alert messages to clients when something happens.
any ideas are appreciated.
Assuming you need to do this on linux, you may run any php script from the browser and from the CLI as well.
You may run a simple php script:
<? echo "Ana are mere"; ?>
like this:
php -f ./index.php
Be careful about file-permissions, and any bug that may creep inside your code, memory leaks or unallocated variables will become VERY visible now, as the process will run continuously.
If you dont want it running in the background all the time, take a look at crontab (http://unixgeeks.org/security/newbie/unix/cron-1.html) to be able to start jobs regularly.
-- edit--
take a look at php execute a background process and PHP: How to return information to a waiting script and continue processing
Basically you want to start a background process, and you may do this by either using exec() or fsockopen() or a file_get_contents() on your own script probably in this order, if don't have access to exec, or socket functions.
Also take a look at http://us2.php.net/manual/en/function.session-write-close.php so the "background script" won't "block" the request and http://us2.php.net/manual/en/function.ignore-user-abort.php
Use a cron job to do it http://www.cronjobs.org/
You can automatically call a script at any interval you like indefinitely. Your hosting provider should support them if they are good.
You should also consider putting a unique key on the end of the page
ie. www.yoursite.com/cronjob.php?key=randomstring
and then only run the script if the key is correct, to prevent bots and other users from running the script when you don't want it run.
If you can't create a cron job, then create a page that does what you want and create a scheduled task on another machine (maybe your PC?) that just goes out and hits that page at a certain time every day.
It's really a hack, but if you absolutely can't set up a cron job, it would be an option.
As Evernoob and Quamis said, you want to have a cron job (UNIX/Linux/Mac OS) or a scheduled task (MS Windows). Furthermore, you can either have the PHP script run using the PHP command line interface (CLI), in which case you can invoke the PHP executable and then your script name. As an alternate, you can use a tool like wget (availble on all platforms) to invoke the PHP script as if someone had typed the URL in the location bar of a web browser.
A php script could not be used like you imagine here. Because it's executed through apache after a request from somewhere.
Even if you do while(1) in your script, apache/php will automaticly stop your script.
Responding to your comment, yes you'll need ssh access to do this, except if your web interface allow you to add cronjob.
Maybe you can write a service which can be executed with a program on another server and do the job.
If you have no access to the server the easiest way would probably be to hit it through the browser, but that would require you or an external script hitting the URL at the same interval each day when you wanted it to one. You may also be able to setup a Selenium test suite that runs locally on a schedule and hits the page. I'm not 100% if that's possible with Selenium though, you may need some 3rd-party apps to make it happen.
Something else you could try would be to see about using PHP's Process Control Functions (link). These will let you create a script that is a deamon and runs in the background. You may be able to do this to keep the script running on the server and firing off commands at programmed intervals. You will still need some way to get it running the first time (browser request or via command line) though.