解析错误:语法错误，意外结束文件- WordPress插件

我刚买了一个WordPress插件，并试图激活使用仪表板。我试着自己解决这个问题，但没有成功。

 '2'); ?>
Parse error: syntax error, unexpected end of file

我的代码

<?php
function sourceGuard_cp(){
global $sourceGuard_settings;
?>
<div class="wrap">
<h2>Source Guard Settings</h2>

<?
$current_mode = $sourceGuard_settings['mode'];
$enabled_modules = array('html_obfuscator' => false, 'js_encoder' => false);
if(isset($_POST['submit'])){
    if(($_POST['html_obfuscator'] == 1) && ($_POST['js_encoder'] == 1)){
        $new_mode = '3';
    }
    else if($_POST['html_obfuscator'] == 1){
        $new_mode = '1';
    }
    else if($_POST['js_encoder'] == 1){
        $new_mode = '2';
    }
    else{
        $new_mode = '0';
    }

    if($fp = @fopen(plugin_dir_path(__FILE__).'settings.php', 'w')){
        $current_mode = $new_mode;
        fwrite($fp, "<?'n'$sourceGuard_settings = array('mode' => '".$current_mode."');'n?>");
        fclose($fp);
        echo '<div id="setting-error-settings_updated" class="updated settings-error"> <p><strong>Settings saved.</strong></p></div>';
    }
    else{
        echo '<div id="setting-error-settings_updated" class="error settings-error"> <p><strong>Settings cant be saved!</strong></p></div>';
    }
}
switch($current_mode){
    case '1';
        //html obfuscation
        $enabled_modules['html_obfuscator'] = true;
    break;
    case '2';
        //js encoding
        $enabled_modules['js_encoder'] = true;
    break;
    case '3';
        //html+js
        $enabled_modules['html_obfuscator'] = true;
        $enabled_modules['js_encoder'] = true;
    break;
}
?>

<form action="" method="POST">
<h3>Available modules</h3>
<table class="form-table">
<tr valign="top">
<th scope="row"><label>HTML obfuscation</label></th>
<td>
    <label><input name="html_obfuscator" type="radio" value="1" autocomplete="off"<?=($enabled_modules['html_obfuscator'])?' checked':'';?>>&nbsp; <span>Enabled</span></label>&nbsp;&nbsp;
    <label><input name="html_obfuscator" type="radio" value="0" autocomplete="off"<?=(!$enabled_modules['html_obfuscator'])?' checked':'';?>>&nbsp; <span>Disabled</span></label>
</td>
</tr>
<tr valign="top">
<th scope="row"><label>JavaScript encoding</label></th>
<td>
    <label><input name="js_encoder" type="radio" value="1" autocomplete="off"<?=($enabled_modules['js_encoder'])?' checked':'';?>>&nbsp; <span>Enabled</span></label>&nbsp;&nbsp;
    <label><input name="js_encoder" type="radio" value="0" autocomplete="off"<?=(!$enabled_modules['js_encoder'])?' checked':'';?>>&nbsp; <span>Disabled</span></label>
</td>
</tr>
</tr>
</table>
<p class="submit"><input name="submit" id="submit" class="button-primary" value="Save Changes" type="submit"></p>
</form>
</div>
<?
}
?>

当我试图激活WordPress仪表板中的一个插件时，我得到了这个错误。

请帮我解决这个问题