Analysis of PHP external variables

For beginners of PHP, the understanding of variables is still vague. I hope you can use this article to have a detailed understanding of the PHP external variables and deepen your understanding of the PHP language.

PHP external variable sample code:

1. <Form action = "one. php"
2. Method = "get">
3. User: <input type = "text"
4. Name = "username"> <br>
5. Password <input type = "password"
6. Name = "pass"> <br>
7. <Input type = "submit" values "OK">
8. </Form>

 
 

  
  
< ?php  
  
  
Echo “user”;  
  
  
Echo $_get[“username”];  
  
  
?> 
 
 

$ _ Get can only accept data sent back by the get Method

$ _ Post can only accept data sent back by the post Method

$ _ Request can accept data sent from all methods

It can also be passed directly. PHP external variables are separated.

<A href = "one. php? Name = hello & pass = hello "> hello </a>.

It is best to use $ _ get or $ _ request to receive the request.

Other PHP external variables

$ _ Files

$ _ Cookie

$ _ Session

The passed PHP external variables can be used directly on this page.