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If you use the normal PHP POST file upload method mentioned in official PHP page, chances are you may get empty $_POST or $_FILES array. In my case, I am creating a page that allow people to upload a CSV file (can be a very large file, e.g. >10M), then everything is following what is mentioned in the official PHP page.  However, the $_POST and $_FILES do not have any data when I print_r() it. Probably it is the main reason: your upload file size is too big , a.k.a: Size matters . Here are some suggestions: 1. Make your MAX_FILE_SIZE bigger: <input type="hidden" name="MAX_FILE_SIZE" value="9000000000" /> 2. In your PHP code, add this: ini_set('upload_max_filesize', '128M'); ini_set('post_max_size', '128M'); If it does not work, add these in your php.ini file instead of inside your PHP code. post_max_size = 128M upload_max_filesize = 128M  Hope it helps someone, and for my reference.

For information to anyone who want to exclude more than one option of  error_reporting in PHP, use this: error_reporting(E_ALL ^ (E_NOTICE | E_DEPRECATED | E_USER_DEPRECATED)); Use () and | to pick errors that you DON'T want to show. Source:  http://stackoverflow.com/questions/2803772/turn-off-deprecated-errors-php-5-3