Using Crontab to create asynchronous tasks (asynchronously from your PHP code) is a basic approach in which using the task / task queue manager is complex and gives you more control, power and scalability / elasticity.
Crontab is very easy to manage, but does not offer much functionality. This is best for scheduled tasks than for asynchronous tasks.
Deploying the task queue (and its Celery (combined with RabbitMQ ) in Python projects, on the other hand, I'm sure you can find something similar in the PHP world.
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