Using PHP, I want to have scheduled tasks based upon the time the server is currently running.
Say at 7pm on Sunday I want a database query to be ran.
The way in which I've considered doing this is to put the task in the script that is ran on each page load in the session init.
Any ideas?
One method to automatically run a PHP script at specified time intervals is to use Crontab. This can be particularly beneficial for scripts that need to automatically update information without user interaction such as a script that gathers website statistics so that they can be emailed to you or a script that regularly retrieves content from another website.
See: PHP CLI and Cron
You can just use cron to trigger your script for you with something like this:
If you have ssh access you can add a crontab entry like this:
crontab -e
and enter something like this:
0 19 * * 0 php -f /path/to/script/file.php
where 19 is the hour (7pm), 0th day of the week (sunday), and 0 is the minute.
this will run at 7pm on sunday.
This is what your cron tab is for. You can specify whatever tasks, scripts, or other programs you need to run at whatever time you want to run them. Cron is run by your operating system and goes by your operating system's clock.
For example if I wanted to run a PHP script every minute, I would put something like the following into my cron tab.
* * * * * php /path/to/script.php
How you actually create cron entries depends on what your server setup is like. If you have some sort of shell access on a Unix/Linux system, you can edit your cron tab easily by running the following command.
crontab -e
That will bring up the crontab in the default text editor.
If you are using something like cPanel, you will have to consult the manual for information on how to edit cron entries.
The actual syntax for the cron can be complicated at first. There are entry generators online that you can use if you need help.
0 * * * * php /some/script.php # This will execute at the 0 minute of every hour.
0 1 * * * php /some/script.php # This will execute at the 0 minute of the first hour of every day. In other words, every day at 1AM.
You should use your systems Cron deamon to schedule and run a PHP file.
First read up on Cron:
https://help.ubuntu.com/community/CronHowto
Then implement this:
Open crontab:
vim crontab -e
Add an entry to your cron table:
0 19 * * 0 /path/to/php /path/to/script.php
Your script.php will contain the code/logic to query the database.
Related
In our centos6 server. I would like to execute a php script in cron job as apache user but unfortunately it does not work.
Here is the edition of crontab (crontab -uapache -e)
24 17 * * * php /opt/test.php
and here is the source code of "test.php" file which works fine with "apache" user as owner.
<?php exec( 'touch /opt/test/test.txt');?>
I try to replace php with full path of php (/usr/local/php/bin/php) but also it doesn't work.
Automated Tasks: Cron
Cron is a time-based scheduling service in Linux / Unix-like computer operating systems. Cron job are used to schedule commands to be executed periodically.
You can setup commands or scripts, which will repeatedly run at a set time. Cron is one of the most useful tool in Linux or UNIX like operating systems. The cron service (daemon) runs in the background and constantly checks the /etc/crontab file, /etc/cron./* directories. It also checks the /var/spool/cron/ directory.
Configuring Cron Tasks
In the following example, the crontab command shown below will activate the cron tasks automatically every ten minutes:
*/10 * * * * /usr/bin/php /opt/test.php
In the above sample, the */10 * * * * represents when the task should happen. The first figure represents minutes – in this case, on every "ten" minute. The other figures represent, respectively, hour, day, month and day of the week.
* is a wildcard, meaning "every time".
Start with finding out your PHP binary by typing in command line:
whereis php
The output should be something like:
php: /usr/bin/php /etc/php.ini /etc/php.d /usr/lib64/php /usr/include/php /usr/share/php /usr/share/man/man1/php.1.gz
Specify correctly the full path in your command.
Type the following command to enter cronjob:
crontab -e
To see what you got in crontab.
EDIT 1:
To exit from vim editor without saving just click:
Shift+:
And then type q!
I had the same problem... I had to run it as a user.
00 * * * * root /usr/bin/php /var/virtual/hostname.nz/public_html/cronjob.php
You may need to run the cron job as a user with permissions to execute the PHP script. Try executing the cron job as root, using the command runuser (man runuser). Or create a system crontable and run the PHP script as an authorized user, as #Philip described.
I provide a detailed answer how to use cron in this stackoverflow post.
How to write a cron that will run a script every day at midnight?
I tried all combinations with PATHs, but don't work. Probably they are needed.
In my case, with Centos 7, a reboot or server worked.
I have a database with a bunch of links that I want to keep updated. Basically if a link returns a 404 error code I want to remove it from the database. I have a script that I am using however I need to run it manually. How can I make this work using CRON?
in your shell as cron user (or root):
crontab -e
This will bring up your crontab file in your editor. Add a new line something like this:
* */12 * * * /path/to/script
Save/exit the file.
Now for a quick lesson on cronjobs:
-The first 5 arguments in the line tell how often, or when the cron daemon will execute the 6th argument.
-From left-right, arguments represent: minutes, hours, days, weeks, months
-An asterix (*) tells the cron to run on all values of it's associated time measurement (example * * * * * means to run every minute, of every hour, of every week, and of every month!)
In my example, * */12 * * * means to run every 12 hours.
Check out: http://kevin.vanzonneveld.net/techblog/article/schedule_tasks_on_linux_using_crontab/
To run a PHP script with cron you can use the PHP executable and the path to the script.
On most linux systems you want to edit your cron file (the crontab) with the command crontab -e. This will open up a command line based editor and you can just append your new job to the bottom of the file using this format.
<minute> <hour> <day_of_month> <month> <day_of_week> php /path/to/script
If the commands dont work for you let me know what distribution you are using and I can modify the instructions.
/usr/bin/php -q /home/user/public_html/script.php
I have a Linux server and in this I want to execute a cron job for sending birthday mail to all my friend with a PHP program. I want to create a php program that read data from database and send the mail.
I want to know the command of cron job to execute the program on every day automatically. I have no knowledge of Linux commands.
You will want to read up a little bit on the 'crontab' command but basically you will do this.
From a linux command prompt run the crontab command.
Then add this entry:
* * * * * php yourscript/path
You can set what time by modifying the * values. See this URL for information on that:
http://adminschoice.com/crontab-quick-reference
This is the command to add to your crontab file:
0 0 * * * /usr/bin/php /path/to/your/script.php
Adjust the paths to the PHP interpreter and your script as necessary. It will run your script every day at midnight.
This is done using a cron table in unix systems, including linux. Check out some example documentation:
http://en.wikipedia.org/wiki/Cron
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/crontab.html
You'll find many more, if you google for crontab, or if you check out the man crontab pages on your linux box
i have a php script that should be run automatically every day.
as the php script is run on a request,how can i do it?
is there any way else using cronjob task?
Two options:
Use crontab demon
Hire a worker and make him open script in a browser every 24 hours
The choice is yours :)
To use crontab, type crontab -e in console, the text file opens. Add a line at the end:
0 0 * * * /usr/bin/php /var/www/mysite/httpdocs/daily_stats.php
Where:
0 0 * * * - run every day at 00:00
/usr/bin/php -path to your PHP (can be determined by which php command)
/var/www/mysite/httpdocs/daily_stats.php - path to your PHP script
if which php outputs nothing, install PHP cli by running:
sudo aptitude install php5-cli
Good luck!
use cron job option who start automatically and give result before 24 hours
Use the cron job, this is the best solution.
otherwise, you can run an infinite loop inside php and sleep 24 hours.
horrible solution though.
If cron isn't available in some sort of way you could use Google app engine's cron for this. Because cron is the way to go.
If cron is not available you could execute a php script in CLI which will run all the time.
In the script you can make a infinite while loop.
In the while loop, check a file on disk or a db record (you can controll this file or db record from an external script, telling the looping script what to do (CLI execute another script at a given hour) and when to exit)
If you use a database,don't forget to initialize and close the db connection each time the loop runs.
I'd sleep the loop every 1 min or so.. you could use this instead of linux cron for many more things.
I want to mail after 6 hours automatically to my user who hasn't fully completed form on my website.
Help Me
Use crontab -e to edit the cron table for your account.
In the crontab, put an entry something like...
0,10,20,30,40,50 * * * * /usr/bin/wget -O - -q http://path.to/cron.handler.php
or the equivalent
*/10 * * * * /usr/bin/wget -O - -q http://path.to/cron.handler.php
...which will run the cron handler php file every 10 minutes using wget (there are other options as well, and you may need to edit the command appropriately). (Note: you don't want to just run it every 6 hours, because then if someone happened to fill out the form right after it ran, it wouldn't have been 6 hours since they filled it out next time it runs, so you'd end up with 10-11 hour gaps.)
Then in your PHP file, find users who BOTH (a) haven't fully completed the form for at least 6 hours and (b) haven't been emailed yet. Send them an email, and mark them as having been emailed.
You will need to create the php script that does the checking and mailing, and then set the cron job like the following
/path/to/php -q /home/username/public_html/mycheckingscript.php
Obviously you will need to adjust the first path to point to your php binary, and the second path to point to the full location of your checking & mailing script.
I don't think you want to set the cron up using php. Instead write a php script and then have cron execute that script every hour or so. This would be something that is going to be dependent on your operating system.
For linux, here is the manpage for using crontab.
There is no way you can change/add a schedule on the cron job on the fly. according to my experience. because until now i did not find..