无法从String中过滤奇怪的撇号

Question

我正在解析一些东西，并遇到一个奇怪的撇号’，这会破坏我在’

中解析后的字符串重新整理

我尝试了什么：

htmlentities()，iconv()，utf8encode()，utf8_decode()

我的消毒功能，目前有点凌乱，并试图摆脱那个恶人

  public function sanitizeName($name) {

    $valid = range('a', 'z');
    $valid = array_merge($valid, range('A','Z'));
    $valid = array_merge($valid, range(0,9));
    $valid = array_merge($valid, array('_',',','.','?','!',' ','-',':',';','#','+',     '"'));

    $name = trim($name);
    $name = str_replace(array('\\', '/','’', '`', '´'), '', $name);
    $name = preg_replace('/\[.+\]/', '', $name);
    $name = preg_replace('/\(.+\)/', '', $name);
    $name = utf8_decode($name);
    $valid_name = '';
    for($i = 0, $len = strlen($name); $i < $len; $i++) {
        if(in_array($name[$i], $valid)) {
            $valid_name .= $name[$i];
        }
    }
    if(stripos($valid_name, '├') !== false) { //that one isn't even triggering
        echo 'adsfg';die;                     //even though the character is there
    }
    $name = trim($valid_name);
    if(strlen($name) > 0) {
        return $name;
    }
    return null;
}

现在，我怎么能摆脱它？