What are best practices for handling checkbox functionality in PHP to avoid display issues in different browsers?

When dealing with checkbox functionality in PHP, it's important to ensure that the checkboxes are properly checked or unchecked based on the user's input. To avoid display issues in different browsers, it's recommended to use the "checked" attribute in the HTML input tag to set the checkbox as checked. This attribute should be dynamically generated based on the user's input or stored data.

// Example code snippet to handle checkbox functionality in PHP

// Retrieve checkbox value from form submission
$checkbox_value = isset($_POST['checkbox_name']) ? $_POST['checkbox_name'] : '';

// Check if checkbox is checked
$checked = ($checkbox_value == 'on') ? 'checked' : '';

// Output HTML checkbox input with dynamic "checked" attribute
echo '<input type="checkbox" name="checkbox_name" ' . $checked . '>';