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How can PHP be utilized to create a preview of marked areas on images to ensure accuracy for users in a CMS setting?

When working with images in a CMS, it's important to provide users with a preview of the marked areas to ensure accuracy. This can be achieved by using PHP to dynamically generate a preview image with the marked areas highlighted. By overlaying the marked areas on the preview image, users can visually confirm the accuracy of their selections before saving.

php 
// Get the original image path and marked areas from the CMS
$originalImagePath = 'path/to/original/image.jpg';
$markedAreas = array(
    array('x' => 100, 'y' => 150, 'width' => 50, 'height' => 50),
    array('x' => 200, 'y' => 300, 'width' => 75, 'height' => 75)
);

// Create a new image based on the original image
$originalImage = imagecreatefromjpeg($originalImagePath);
$previewImage = imagecreatetruecolor(imagesx($originalImage), imagesy($originalImage));
imagecopy($previewImage, $originalImage, 0, 0, 0, 0, imagesx($originalImage), imagesy($originalImage));

// Overlay the marked areas on the preview image
$highlightColor = imagecolorallocate($previewImage, 255, 0, 0);
foreach ($markedAreas as $area) {
    imagerectangle($previewImage, $area['x'], $area['y'], $area['x'] + $area['width'], $area['y'] + $area['height'], $highlightColor);
}

// Output the preview image
header('Content-Type: image/jpeg');
imagejpeg($previewImage);

// Clean up
imagedestroy($originalImage);
imagedestroy($previewImage);

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