The ninth day of learning PHP in ten days_PHP tutorial

Learning purpose: Things to note

Because I learned ASP first, I will find many things that need to be adapted when I do PHP.

1. Be careful not to miss the semicolon
2. Be careful not to miss the $ before the variable
3. When using SESSION, be careful not to miss session_start();

If When an error occurs, you can use the following methods:
1. If the SQL statement is wrong, comment it and then output the SQL statement. Note that you should also comment the subsequent execution of the SQL statement
2. If the variable is empty, Most of them are not passed in place, check the output variables, check the id and name of the form
3. If there is a database connection error, check whether MY SQL is opened correctly and whether the connection statement is missing
4. Pay attention to the indentation. Eliminate the error of mismatched brackets

When building a large website, my idea is to first build a database and determine the role of each field and the relationship between the tables. Then design the backend interface, starting from adding data, because whether the addition is successful can be directly verified in the database, and then the page is displayed after adding it, and finally the combination of the two. Generally speaking, the backend includes addition, deletion, modification and display. There is no problem in the backend, and there is no big problem in the frontend. The front desk also needs to pay attention to security and fault tolerance as well as output format.

Okay, that’s it for today. Tomorrow I’ll talk about how to use PHP to upload files and send emails.

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