now i want to make a mailing list .. i want to send a mail up to 2000 user. but the server only allow sending 200 mail at once so i want to make a cron job that make the following task.
1- send mail to 200 user
2- i have a database that have a filed name e-mail that contains mail address and
flags field that contains zero or one
zero -> not sent yet
one -> e-mail sent

3- change the flag in the database from zero to one

4- after an hour the cron will run again and send the mail to the fields of database that have the flag zero.. and i will make the cron run until there is no flags zero so that all mails are sent..

my problem is that i dont know how to work with cron job from PHP i want to know how to run cron Job from php??

NOTE THAT: when the user press send button it will create the cron job for sending the 2000 mail and run every hour to send 200 mail per time ..

can any one help me plz

use the php sleep() function to slow down the script. something like sleep(30) should keep you under 200 emails an hour.

I run cron from cpanel. I set it up to run once a day.

Using sleep is a bad idea, assuming you are on a shared hosting plan. Sleep halts execution, but the script will still be running for the duration. Use cron.

Cron is not a part of PHP. Technically you can create a crontab by using the exec command, but as saepl said, you would normally set it up through cpanel.