What array can be used to obtain get in php?

As a server-side language, PHP often needs to interact with the client (browser). One of the common ways of interaction is to transfer data through GET requests. In PHP, you can use a variety of arrays to obtain the parameters of the GET request. The more commonly used ones are $_GET and $HTTP_GET_VARS.

First, let’s take a look at the GET request. GET is a request method of HTTP protocol. When requesting, parameters will be placed in the URL. These parameters can be parsed by the server to obtain the corresponding data.

For example, there is a URL as follows:

http://www.example.com/index.php?name=Xiao Ming&age=18

Among them, after the number ? name=Xiaoming&age=18 is the parameter part in the GET request, name and age are parameter names, Xiaoming and 18 are parameter values. In PHP, these parameters can be obtained using the two arrays mentioned above.

$_GET array

$_GET is a super global variable built into PHP, which is used to obtain all parameters passed through the GET request. When the client sends a GET request, the parameters will be parsed and stored in the $_GET array. The keys of the array are the parameter names and the values ​​are the parameter values.

Using the $_GET array to obtain parameters is very simple, just use the parameter name as the array subscript. For example, the name and age parameters in the above URL can be obtained in the following way:

$name = $_GET['name'];
$age = $_GET['age'];

Among them, the value of $name is Xiao Ming, and the value of $age is 18. If you want to get multiple parameters, you can also use commas to separate them in the array subscript, such as $_GET['name,age'].

It should be noted that when using the $_GET array to obtain parameters, the parameters need to be filtered and verified to prevent security issues.

$HTTP_GET_VARS array

$HTTP_GET_VARS can also be used to obtain parameters passed through GET requests, but it is obsolete and has been replaced by the $_GET array starting from PHP 4.1.0 version. Using the $HTTP_GET_VARS array to obtain parameters is similar to $_GET. You only need to use the parameter name as the array subscript.

$name = $HTTP_GET_VARS['name'];
$age = $HTTP_GET_VARS['age'];

Summary

GET request is a commonly used one A request method, it is very convenient to pass parameters through the URL. In PHP, to obtain the GET request parameters, you can use the two arrays $_GET and $HTTP_GET_VARS. The former is a built-in super global variable in PHP, and the latter has been replaced and is for understanding only. When using these arrays to obtain parameters, you need to pay attention to the security of the parameters and perform filtering and verification.

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