How Can I Retrieve Input Field Values Using PHP\'s $_GET and $_POST?

Retrieving Input Field Value Using PHP

When working with HTML forms, it often becomes necessary to access and manipulate user input from input fields. PHP provides several mechanisms for doing this, including the $_POST and $_GET superglobals.

Using $_POST or $_GET

To retrieve the value of an input field using PHP, you can use either the $_POST or $_GET superglobals. These superglobals contain an associative array of form field values, keyed by the name of the HTML input tag.

Example

Consider the following input field:

<input type="text" name="subject">

To get the value of this input field and assign it to a session, you can use the following PHP code:

// Using $_GET
$_SESSION['subject'] = $_GET['subject'];

// Using $_POST
$_SESSION['subject'] = $_POST['subject'];

Form Method

The method used in your HTML form determines which superglobal is used to retrieve the input field value:

• GET: Uses the $_GET superglobal to store form data as query string parameters.
• POST: Uses the $_POST superglobal to store form data directly in the request body.

Example Form with GET Method:

  <input type="text" name="subject">

To display the value using $_GET:

echo $_GET['subject']; // Output: "Car Loan"

Example Form with POST Method:

  <input type="text" name="subject">

To display the value using $_POST:

echo $_POST['subject']; // Output: "Car Loan"

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