Printer Daemons Write beautiful code - Separate background programs from front-end programs

When writing PHP programs, some codes are used to process some transactions, such as operating databases, performing mathematical operations, etc., while other codes are only used to display the results of transaction processing, such as some using the echo statement to display the results in HTML format. PHP code on the web browser and those HTML codes embedded directly into PHP programs. First of all, we should clearly distinguish between these two types of code, calling the former a background program and the latter a front-end program.
Because PHP is an embedded programming language, that is to say, all PHP code can be embedded in HTML code, which brings a lot of convenience to program writing. However, if things go to extremes, they must be reversed. If you mix PHP code and HTML code in a long program, it will make the program messy and unfavorable for the maintenance and reading of the program. Therefore, we need to transplant the PHP code mixed in the HTML code in these programs as much as possible, encapsulate these codes into functions in special files, and then use the include statement in the HTML code to include these files at the appropriate location. Just call these functions.
On the one hand, this approach makes both the HTML code and the PHP code simple and easy to read. On the other hand, because the HTML code needs to be constantly updated, this separation method can ensure that the background program will not be destroyed.
Different from front-end programs, back-end programs pursue stability, structure, and few changes, so they should be carefully designed and managed. In fact, it is worthwhile to invest a lot of time when designing desktop programs. "Plant trees now and enjoy the shade later." You will be able to easily use the background programs you write now in future design work.

The above introduces the printer background program. Writing beautiful code - separating the background program from the front-end program, including the printer background program. I hope it will be helpful to friends who are interested in PHP tutorials.