What are the best practices for handling image sizes and quality when uploading photos for a PHP-based slideshow?

When uploading photos for a PHP-based slideshow, it is important to consider both image size and quality to ensure optimal performance and user experience. To handle this, you can resize and compress the images before storing them on the server. This can be achieved using PHP libraries such as GD or Imagick to resize the images to a specific dimensions and reduce their file size without compromising quality. 

// Example code to resize and compress uploaded image
$target_dir = "uploads/";
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
$imageFileType = strtolower(pathinfo($target_file,PATHINFO_EXTENSION));

// Check if image file is a actual image or fake image
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
    $image = imagecreatefromjpeg($_FILES["fileToUpload"]["tmp_name"]);
    $resized_image = imagescale($image, 800); // Resize image to width of 800px
    imagejpeg($resized_image, $target_file, 80); // Compress image with quality of 80
    imagedestroy($image);
    imagedestroy($resized_image);
} else {
    echo "File is not an image.";
}

Keywords

image sizes image quality uploading photos PHP slideshow handling techniques

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