PHP/MySQL - Multiple queries at the same time

Question

I have 24 databases with a table labeled email_queue.

I have another database with a list of all the databases that have the email_queue table

Answer 1

In your script try this.

1. Use set_time_limit(0); in order to override PHP's max_execution_time
2. Use the getopt() function to get the database name when the script is ran from the command line (i.e. php script.php -d database1).
3. From there do the logic.
4. In your crontab make an entry for each database you would like to send emails from using the switch (-d) I specified in 2. If you have 20 databases then you must have 20 entries.

Using this way you will see a separate PHP process for each cron job and you can isolate a database if ever you will encounter an error with it.