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If a user then enters your site on a Tuesday, the site will have background_2as background, and the next day, background_3 In the next lesson, you will be introduced to new building blocks that can be used to make loops and repetitions in your codes.
We went through some very simple examples in the previous lesson mostly to show you what PHP is.The syntax for an SQL statement that updates the fields in a table is: With the knowledge you now have from the lessons 19, 20 and 21, it should be quite easy to understand how the above syntax is used in practice. The code below updates Donald Duck's first name to D. The other information (last name and birthdate) are not changed.You can try to change the other people's data by writing your own SQL statements. You have learned to insert, retrieve, delete and update a database with PHP.Unless you are a mathematical genius, it quickly becomes complicated to count the number of seconds since January 1, 1970 to a specific time in the future or past.But here you can get help from another nifty function: mktime, which does the calculations for you.Thus, you are actually now able to make very advanced and dynamic web solutions, where the users can maintain and update a database using forms.If you want to see a sophisticated example of what can be made with PHP and databases, try to join our community.More importantly, when will you learn something you can actually use on your pages?The answer is that what you learn here are building blocks - the only limitations to what you can build are your creativity and imagination!I would venture to say that you have already learned more than you think.For example, do you think you can make a website with different background images each day of the week and that works in all browsers? Look at this example: The example above, with a dynamic background image, simply requires that you make seven images and name them background_1.png, background_2.png, background_3.png, etc.