How can PHP be utilized to automatically close a popup window when an image is clicked on?

To automatically close a popup window when an image is clicked on using PHP, you can include a JavaScript function in the HTML code that will close the window. This function can be triggered by an onclick event on the image element.

<?php
echo "<script>
function closePopup() {
    window.close();
}
</script>";
?>

<img src="image.jpg" onclick="closePopup()">