gistfile1.php

<?php

if(count($argv) != 2) {
    echo "Attempt to recursively convert a directory of XML files to UTF-8 and Fix any unescaped & symbols\n";
    echo "Usage {$argv[0]} directory\n";
    exit(1);
}

$path = realpath($argv[1]);

$objects = new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path), RecursiveIteratorIterator::SELF_FIRST);
foreach($objects as $name => $object){
    if(mb_strtolower($object->getExtension()) == 'xml') {
        $contents = file_get_contents($object->getRealPath());
        $encoding = mb_detect_encoding($contents);

        if(!$encoding) {
            $encoding = 'Unknown';
        }

        echo "{$name}: Probably ". $encoding . " converting to UTF-8\n";

        $decoded = mb_convert_encoding($contents, 'UTF-8');

        $regex = "/(?!<\\!\\[CDATA\\[)(?:&([^;\\W]*([^;\\w]|$)))(?!\\]\\]>)/";
        $replacement = "&amp;$1";
        $decoded = preg_replace($regex, $replacement, $decoded);

        file_put_contents($object->getRealPath(), $decoded);
    }
}