PHP 7 Form Processing Guide: How to Get Form Data Using the $_REQUEST Array

PHP 7 Form Processing Guide: How to use the $_REQUEST array to get form data

Overview:
When a user fills out a form on a web page and submits it, the server-side code needs to process the form data. In PHP 7, developers can easily obtain form data using the $_REQUEST array. This article will introduce how to correctly use the $_REQUEST array to process form data, and provide some code examples to help readers better understand.

1. Understand the $_REQUEST array:
The $_REQUEST array is a global variable used to obtain data in user requests in PHP programs. It can obtain data from GET and POST requests, so it is very commonly used for processing form data. The key name of the $_REQUEST array is the name attribute value of the form element, and the value is the actual data entered by the user in the form.

2. Use the $_REQUEST array to obtain form data:
The following is a simple form example, including a text box and a submit button:

You can use the $_REQUEST array in the process.php file to get the user's Data entered in the form. For example, you can get the name entered by the user through $_REQUEST["name"]. Please see the following code example:

$name = $_REQUEST["name"];
echo "The name you entered is:".$name;

The above code will Output: "The name you entered is: [name entered by user]". In actual development, the form data can be further processed and verified according to your own needs.

3. Distinguish between GET and POST requests:
$_REQUEST array can obtain the data in GET and POST requests, so if there is data from both GET request and POST request, you can use $_REQUEST to obtain it. But it should be noted that in some cases we may need to distinguish the data of GET and POST requests. Here is an example:

In the process.php file , you can use the $_POST array to obtain the data of the POST request, and the $_GET array to obtain the data of the GET request. Please see the following code example:

if (isset($_POST["name"])) {
$name = $_POST["name"];
echo "The name you entered Is: ".$name;
}

if (isset($_GET["age"])) {
$age = $_GET["age"];
echo " The age you entered is: ".$age;
}

The above code will obtain the corresponding data according to the different request methods of the form, and process and output accordingly.

4. Processing special characters:
When processing form data, we need to pay attention to escaping special characters to prevent security vulnerabilities. PHP provides some functions to handle these special characters, such as the htmlspecialchars() function for escaping HTML special characters, and the mysqli_real_escape_string() function for escaping SQL special characters.

Please see the following code example:

$name = htmlspecialchars($_REQUEST["name"]);
$age = mysqli_real_escape_string($conn, $_REQUEST["age" ]);

The above code will escape $name and $age to ensure data security.

Summary:
In PHP 7, using the $_REQUEST array can easily get form data without distinguishing between GET and POST requests. This article describes how to use the $_REQUEST array to obtain form data and provides some code examples to help readers understand better. In actual development, developers should pay attention to escaping special characters to ensure data security. I believe that through the introduction of this article, readers will have a clearer understanding of PHP 7 form processing.

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