What are the potential methods for retaining user input in a form field across visits in PHP?

To retain user input in a form field across visits in PHP, you can utilize sessions or cookies to store the input data. Sessions are stored on the server side, while cookies are stored on the client side. By storing the input data in a session or cookie when the form is submitted, you can pre-fill the form field with the stored data when the user revisits the page. 

// Start a session
session_start();

// Check if form data has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Store the form data in a session variable
    $_SESSION['user_input'] = $_POST['form_field_name'];
}

// Pre-fill the form field with the stored data
<input type="text" name="form_field_name" value="<?php echo isset($_SESSION['user_input']) ? $_SESSION['user_input'] : ''; ?>">

Keywords

session variables cookies local storage form persistence PHP functions

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