How to determine the max file upload limit in php

Question

How can the file upload size allowed by php settings be determined withing a php script?

Answer 1

function return_bytes($val) 
{
    $val = trim($val);
    $last = strtolower($val[strlen($val)-1]);

    switch($last) 
    {
        case 'g':
        $val *= 1024;
        case 'm':
        $val *= 1024;
        case 'k':
        $val *= 1024;
    }

    return $val;
}

function get_upload_max_filesize()
{
    $max_upload = return_bytes(ini_get('upload_max_filesize'));
    $max_post = return_bytes(ini_get('post_max_size'));
    return min($max_upload, $max_post, $memory_limit);
}