A brief discussion of PHP syntax (5)_PHP tutorial

As mentioned above, it is very convenient to submit form information in PHP. 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

< ;form action="deal-1.php">
Enter the singer you think is good:

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 "Can you say $start? ? ";
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 you can pass it on again

The description form submitted the variable $start to deal-1.php, and in the display results of deal-1.php, if we click the link "Try whether it will be passed on again", deal-2.php The processing result 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.

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 "";
?>

Analyzing the program, you will find that just adding "?start=$start" after deal-1.php is enough, and the function of this is parameter passing. For example: http://zhuagk12.oso.com.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.

http://www.bkjia.com/PHPjc/532530.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/532530.htmlTechArticleAs mentioned above, it is very convenient to submit form information in PHP. However, what is the life cycle of the variables in the submitted form information? This article comes to Kunming to talk about this issue. The parameters of the form...