Are there any best practices for centering and resizing thumbnails based on the dimensions of a cropped image in PHP?

When displaying thumbnails of cropped images, it is important to center and resize the thumbnails based on the dimensions of the cropped area to ensure the important parts of the image are still visible. One way to achieve this is by calculating the dimensions of the cropped area and then resizing the thumbnail accordingly while keeping it centered. 

// Get the dimensions of the cropped area
$croppedWidth = 200; // example width of cropped area
$croppedHeight = 150; // example height of cropped area

// Set the desired thumbnail dimensions
$thumbWidth = 100; // desired thumbnail width
$thumbHeight = 75; // desired thumbnail height

// Calculate the resizing ratio
$widthRatio = $thumbWidth / $croppedWidth;
$heightRatio = $thumbHeight / $croppedHeight;

// Determine the resizing ratio to use
if ($widthRatio < $heightRatio) {
    $resizeRatio = $widthRatio;
} else {
    $resizeRatio = $heightRatio;
}

// Calculate the new dimensions of the thumbnail
$newWidth = $croppedWidth * $resizeRatio;
$newHeight = $croppedHeight * $resizeRatio;

// Output the resized thumbnail
echo "<img src='thumbnail.jpg' width='$newWidth' height='$newHeight' style='margin:auto;'>";

Keywords

image cropping thumbnail resizing centering PHP functions dimensions

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