A brief discussion of PHP syntax 5_PHP tutorial

As mentioned above, it is very convenient for PHP to submit form information. However, what is the life cycle of the variables in the submitted form information? This article comes to Kunming to talk about this issue. There is no doubt that the parameters of the form will be passed to the next handler. Because, we have had such an example. But will it continue to be passed to the next handler?
The answer is no! The parameters submitted by a Form form are only passed to the first handler, and they will not take effect in the next handler. Let’s take a look at the following example:
File: table.html

File: deal-1.php
echo "";
echo "You like $start , right?
";
echo "Try to see if it will be passed on again";
echo "";
?>
File: deal-2. php
echo "";
echo "Do you think $start is good?";
echo "";
?>
From the above example, we can see: the result of deal-1.php processing is (assuming we entered "Jacky Cheung" in table.html): You like Jacky Cheung, right?
Try to see if it will be passed on again
It means that the form submitted the variable $start to deal-1.php, and in the display result of deal-1.php, if we click the link "Try if it will be passed on again" After "pass it on", the processing result of deal-2.phkunp is:
Do you agree?
Obviously, $start is not passed to deal-2.php. But, how do we extend the life cycle of $start? In fact, this is very simple, just use the parameter passing method. For example, we can change deal-1.php to this:
echo "";
echo "You like $start, right?lt; br>";
echo "Try to see if it will be passed on again";
echo "";
?>
Distinguish the program, you will find that you are just dealing- 1. Just add "?start=$start" after php, and the function of this is parameter passing. For example: http://zhuagk12.oso.kuncom.cn/cartoon.php?no=1 What follows is the parameter, no is the parameter name, and its value is 1. In this way, the variable $no will be generated in the cartoon.php program, with a value of 1. If more than two parameters are passed, separate them with &. For example: http://zhuagk12.oso.com.cn/cartoon.php?no=2&debug=1
In order to extend the life cycle of parameters, we can also use Cookie or Session to achieve this. I won’t go into details here. You will see their usage in future articles.