When working with file sizes in PHP you work with bytes, which often is not what you want. In most cases I prefer to work with megabytes rather the bytes, I came across a snippet on Stackoverflow that solved this issue in a great way.
First, define the different sizes:
define('KB', 1024);
define('MB', 1048576);
define('GB', 1073741824);
define('TB', 1099511627776);
Then you can use them in if statements calculations ie to only allow images less than 20MB:
if ($size < 20*MB) {
Super handy!
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