Parses the PHP's $_FILES array when multiple file input is used, it will return an array as each file was from a different input. It also works when multiple and single inputs are mixed

parse_files.php

<?php

/**
 * Parses the PHP's $_FILES array when multiple file input is used, it will
 * return an array as each file was from a different input. It also works
 * when multiple and single inputs are mixed
 * 
 * @author   Pedro Sanção <pedro at sancao do co>
 * @license  MIT Licence
 */
function parse_files() {
    $files = array();
    foreach ($_FILES as $fieldName => $file) {
        reset($file);
        $key = key($file);
        if (is_array($file[$key])) {
            $propeties = array_keys($file);
            $fieldNamekeys = array_keys($file[$key]);
            foreach ($fieldNamekeys as $namekey) {
                $fileKey = "{$fieldName}_{$namekey}";
                $files[$fileKey] = array();
                foreach ($propeties as $property) {
                    $files[$fileKey][$property] = $file[$property][$namekey];
                }
            }
        } else {
            $files[$fieldName] = $file;
        }
    }
    return $files;
}