How can PHP scripts pass variable values to HTML form fields?

To pass variable values from PHP scripts to HTML form fields, you can simply echo the variable value within the form field's value attribute. This way, when the HTML form is rendered, the field will already have the desired value pre-filled.

<?php
// Variable containing the value to pass to the form field
$variable = "Hello, World!";

// Echo the variable value within the form field's value attribute
echo '<input type="text" name="example_field" value="' . $variable . '">';
?>