php notification

how to make a notification code in开发者_运维问答 php? when user make a booking request how to notify admin that there were incoming booking request?

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There are several possibilities, including:

• Send an email notification to a known address

• Use a database trigger to populate a view that the admin user will see on their app's page

• Write a message to a queue (such as AMQP) that will be read by another application.