How can PHP be used to fill out a form via URL?

To fill out a form via URL using PHP, you can pass the form values as query parameters in the URL and then use PHP to extract those values and populate the form fields accordingly. This can be useful for pre-filling form fields with data from a previous page or external source. 

<form action="submit_form.php" method="post">
  <input type="text" name="username" value="<?php echo isset($_GET['username']) ? $_GET['username'] : ''; ?>">
  <input type="email" name="email" value="<?php echo isset($_GET['email']) ? $_GET['email'] : ''; ?>">
  <input type="submit" value="Submit">
</form>

Keywords

PHP form filling URL GET method query string

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