What are the key considerations when allowing users to select images from a predefined list on a server using PHP?

When allowing users to select images from a predefined list on a server using PHP, it is important to ensure that the selected image is valid and exists in the predefined list to prevent any potential security risks or errors. This can be achieved by validating the user input against the predefined list of images before processing it further. 

// Predefined list of images
$allowedImages = ['image1.jpg', 'image2.jpg', 'image3.jpg'];

// Get user-selected image
$userSelectedImage = $_POST['selected_image'];

// Validate user-selected image against predefined list
if (in_array($userSelectedImage, $allowedImages)) {
    // Process the selected image
    echo "Selected image: " . $userSelectedImage;
} else {
    // Handle invalid image selection
    echo "Invalid image selection";
}

Keywords

file_get_contents file_exists scandir image file formats server-side validation

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