Are there best practices for integrating PHP with image mapping for interactive features on a website?

To integrate PHP with image mapping for interactive features on a website, one best practice is to use the `imagecreatefrompng()` function to create an image resource from a PNG file. Then, you can use the `imagecolorat()` function to get the color index of a pixel in the image. Finally, you can use this information to create interactive features such as clickable regions on the image.

// Create image resource from PNG file
$image = imagecreatefrompng('image.png');

// Get color index of a pixel at coordinates (x, y)
$colorIndex = imagecolorat($image, $x, $y);

// Use $colorIndex to implement interactive features
// For example, check if the pixel color matches a specific region
if ($colorIndex == $desiredColorIndex) {
    // Do something when the user clicks on this region
}

// Free up memory by destroying the image resource
imagedestroy($image);