Four ways of asynchronous execution in php

1. Use Ajax and img tag

Principle: Insert Ajax code or img tag into the HTML returned by the server, and the src of img is the program that needs to be executed.

Advantages: Simple implementation, the server does not need to perform any calls.

Disadvantages: During execution, the browser will always be in the loading state, so this method is not a true asynchronous call.

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2. Use popen

Use popen to execute Command, syntax:

Advantages: Fast execution

Disadvantages:

1. Can only be executed on this machine

2. You cannot pass a large number of parameters

3. Many processes will be created when the traffic is high

3. Use curl

to set the curl timeout CURLOPT_TIMEOUT to 1 (minimum is 1), so the client needs to wait 1 second.

4. Using fsockopen

fsockopen is the best. The disadvantage is that you need to splice the header part yourself.

Note: During the execution process, the client connection is disconnected or the connection times out, which may cause incomplete execution, so it is necessary to Plus.

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