What is the potential issue with the PHP script provided for resizing images to thumbnails?

The potential issue with the PHP script provided for resizing images to thumbnails is that it does not check if the uploaded file is actually an image before processing it. This can lead to security vulnerabilities if a malicious user uploads a file that is not an image but is treated as one. To solve this issue, we can add a check to verify that the uploaded file is indeed an image before resizing it. 

// Check if the uploaded file is an image
$check = getimagesize($_FILES["fileToUpload"]["tmp_name"]);
if($check !== false) {
    // File is an image, proceed with resizing
    // Your existing code for resizing images to thumbnails here
} else {
    // File is not an image, handle the error accordingly
    echo "File is not an image.";
}

Keywords

GD library image resizing memory exhaustion file permissions image quality

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