How does php handle the array after returning it?

1. When querying SQL, you should write the query statement well, instead of processing all the queries by the program. In this way, the speed of query and processing will be slow. The other is to read one by one and return it as lv The key of the level is the data of the array
   

2. 1. When registering, a window will often pop up to prompt you with your registration information after successful registration. This type of approach requires returning to the mysql database. The obtained array value is returned to the front page and assigned to the pop-up window.

2. Method:

Return array

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