xyzshop/zmr.php

<?php
declare(strict_types=1);

if (isset($_GET['dir'])) { //config the basedir
    $basedir = $_GET['dir'];
} else {
    $basedir = '.';
}

$auto = 1;

checkdir($basedir);

function checkdir($basedir)
{
    if ($dh = opendir($basedir))
    {
        while (($file = readdir($dh)) !== false)
        {
            if ($file != '.' && $file != '..')
            {
                if (!is_dir($basedir . "/" . $file)) {
                    echo "filename: $basedir/$file " . checkBOM("$basedir/$file") . " <br>";
                } else {
                    $dirname = $basedir . "/" . $file;
                    checkdir($dirname);
                }
            }
        }
        closedir($dh);
    }
}

function checkBOM($filename)
{
    global $auto;
    $contents = file_get_contents($filename);
    $charset[1] = substr($contents, 0, 1);
    $charset[2] = substr($contents, 1, 1);
    $charset[3] = substr($contents, 2, 1);
    if (ord($charset[1]) == 239 && ord($charset[2]) == 187 &&

        ord($charset[3]) == 191) {
        if ($auto == 1) {
            $rest = substr($contents, 3);
            rewrite($filename, $rest);
            return ("<font color=red>BOM found, automatically removed.</font>");
        } else {
            return ("<font color=red>BOM found.</font>");
        }
    } else return ("BOM Not Found.");
}

function rewrite($filename, $data)
{
    $filenum = fopen($filename, "w");
    flock($filenum, LOCK_EX);
    fwrite($filenum, $data);
    fclose($filenum);
}

?>