I want to continuously run a ffmpeg command in php and when this process is running other php methods need to execute in their own process without waiting for the ffmpeg command to complete. How can I do this?
Look into CRON
It lets you schedule tasks you want to run in the background at a specified pattern.
Related
I want to create a PHP script that will run non stop and execute some instructions every minute/hour (according to my need). It should never die.
How should I proceed to this one? How do I start the script itself?
What Iv'e done so far is created an infinite for loop and checking the time and if it's a new minute then calling my function. But when I call the link, it shows my browser is busy.
I want the script to run on Google Compute Engine without any need to call the URL from a second computer. I want something like android foreground service but for PHP.
Cron job is the answer.
Cron is basically a job scheduling daemon. It runs in the background and is executed automatically. You can set it to run at any time that you wish to. This nature of cron makes it useful for automating tasks.
A cron job, is a task which we carry out with the help of a cron.
So if you run a php script with the help of a cron, it'll run on the background. We don't need to run any infinite loops in the script. You can also set a cron job to run at specific time. How it is run and when it is run is totally upto how you configure the cron job. For that you have to edit the crontab file. A cron tab file is a text file containing a list of commands meant to be run at specified times and the commands in the crontab file along with their run times are checked by the cron daemon, which executes them in the system background.
Now, to create or edit entries in your own cron tab file:
$ crontab -e
Add an entry in the crontab file. One thing you have to remember is, for executing php scripts, use the php executable and call the php script from your crontab as shown in the example below
*/2 * * * * /usr/bin/php /var/www/html/project/cron-file.php
This reference might be helpful to you.
Hope this answer helps.
For Unix-system, best practice for such tasks is using Cron: https://en.wikipedia.org/wiki/Cron
Not only for PHP, but any periodical tasks.
I've got a need for some php code to launch more than one instance of Shell exec and run a command.
At present my code trys to run both commands in the same window which makes the second command fail. As the commands need to run at the same time a separate windows is best for me, the command is launching an adobe product.
Any help would be much appreciated.
You need to use threading to do that.
One simple method would be to trigger your shell exec calls through ajax calls, so you can hit 2 parallel ajax url's to trigger your shell exec.
Most by default iis servers allow up to 6 parallel connections from the same client.
Can we run PHP script just like jar's files.I want to execute PHP script in background without open it in browser.Is this thing possible ?
Using Crons we can run. Make a batch file with php commands and run it through task scheduler if you are using windows OS or run it as cron for apache.
I need to run a php script at the scheduled time daily to update some fields in database and to send automated email. How I can do this?
Is it possible to write some service in XAMP server to run the script daily at scheduled time? I have no idea how to update database and send email automatically at the scheduled time. Can any one share some ideas or concepts?
I am using PHP and MySQL running in Linux Server.
You should use a Cron job to do it. Check out the examples on the Wikipedia page.
The Cron Job should call a script using the php executable that runs the necessary task.
Just create the script that does the required job, test it by hitting the URL in your browser once you are sure it works right. Copy the URL and add a Cronjob
Then schedule this command to run at whatever time you want to run
php ABSOLUTE_URL_TO_SCRIPT >> logfile
The log file is optional. But it will give you a chance to see what happened.
For example if you want to run your script every 4 hours, and assuming your script is at http://localhost/work/scripty.php and assuming that your http root is /var/www,
you would run "crontab -e" in terminal and add the following line:
* */4 * * * php /var/www/work/scripty.php
If you need more information just comment I will update the answer.
PHP cannot run script by itself,since php doesn't have daemons like python !!
So you have to take OS help to invoke your custom script .
For example in linux :
(example.sh)
export USE_PHP=php
cd $SCRIPT_ROOTDIR
$USE_PHP -f cronfile.php service="checkdatabase"
(service is the parameter passed to your cronfile).
For setting up cron jobs ,have a look at this link
http://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/
In Linux, We can create .sh file and can give a specific time to run that is called cron job.
SO should use this method just make a shell file and give a time period to it.
You should take a help with linux expert for that.
Use the following: Cron Job
I just can't figure this out.
I have a script that gets data from Facebook API and this script runs all the time. (using set_time_limit(0); )
However, sometimes the Facebook API gives errors and stops the script. Therefor, I would like to have a cron task every 5 minutes or so that checks to see if the script is still running and if not, starts it again.
I tried several things but it looks like I cannot run a exec() command from a cron job because of different user rights or something? How would you guys do this?
I use CentOS and PHP 5.3+
Set up the cron under a different user (say, root), which will get around any rights issues. However, PeeHaa makes a good point: if this is a cron script, there's no reason to use exec, as exec's job is to send commands out to the OS... these commands can be run directly from the crontab rather than having cron execute a php file.
You may want to look into creating a Daemon which is better suited to running a script continuously. You can create one using PHP with this PEAR package System_Daemon
If this process runs very frequently, run it in an endless loop and just sleep it. No need for crontabs.
while(true) {
//magical code stuff
sleep(60);
}