How can PHP be used to retain form field values after a page refresh?

When a form is submitted and the page is refreshed, the form field values are typically lost. To retain these values after a page refresh, we can use PHP to store the form field values in variables and then populate the form fields with these variables. This can be achieved by checking if the form has been submitted and then using the $_POST superglobal array to retrieve the form field values. 

<?php
// Initialize variables to store form field values
$name = '';
$email = '';

// Check if the form has been submitted
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Retrieve form field values from $_POST superglobal array
    $name = $_POST['name'];
    $email = $_POST['email'];
}

?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <input type="text" name="name" value="<?php echo $name; ?>" placeholder="Name">
    <input type="email" name="email" value="<?php echo $email; ?>" placeholder="Email">
    <button type="submit">Submit</button>
</form>

Keywords

PHP form field values page refresh session variables input fields

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