gistfile1.txt

<?php

function determineEncoding($file)
    {
        $string = file_get_contents($file);
        $encodingCandidates = array(
            'UTF-8',
            'ASCII',
            'macintosh',
            'ISO-8859-1',
            'ISO-8859-2',
            'ISO-8859-3',
            'ISO-8859-4',
            'ISO-8859-5',
            'ISO-8859-6',
            'ISO-8859-7',
            'ISO-8859-8',
            'ISO-8859-9',
            'ISO-8859-10',
            'ISO-8859-13',
            'ISO-8859-14',
            'ISO-8859-15',
            'ISO-8859-16',
            'Windows-1251',
            'Windows-1252',
            'Windows-1254',
        );
        $result = false;
        foreach ($encodingCandidates as $item) {
            $sample = iconv($item, $item, $string);
            if (md5($sample) == md5($string)) {
                $result = $item;
                break;
            }
        }
        return $result;
    }