What is the best way to handle file upload and thumbnail creation in PHP?

When handling file uploads in PHP, it is important to ensure that the uploaded file is secure and that a thumbnail image is created for display purposes. One way to achieve this is by using the move_uploaded_file() function to move the uploaded file to a specified directory, and then using the GD library to create a thumbnail image from the uploaded file. 

// Handle file upload
if(isset($_FILES['file'])){
    $file_name = $_FILES['file']['name'];
    $file_tmp = $_FILES['file']['tmp_name'];
    $file_destination = 'uploads/' . $file_name;
    
    if(move_uploaded_file($file_tmp, $file_destination)){
        // Create thumbnail
        $thumbnail = 'thumbnails/thumb_' . $file_name;
        $image = imagecreatefromstring(file_get_contents($file_destination));
        $thumb_width = 100;
        $thumb_height = 100;
        $width = imagesx($image);
        $height = imagesy($image);
        $thumbnail_image = imagecreatetruecolor($thumb_width, $thumb_height);
        imagecopyresampled($thumbnail_image, $image, 0, 0, 0, 0, $thumb_width, $thumb_height, $width, $height);
        imagejpeg($thumbnail_image, $thumbnail);
        
        imagedestroy($image);
        imagedestroy($thumbnail_image);
        
        echo 'File uploaded and thumbnail created successfully.';
    } else {
        echo 'File upload failed.';
    }
}

Keywords

file upload thumbnail creation PHP image processing GD library

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