php 整洁的 & 号问题

如何解决php 整洁的 & 号问题

我有一个 html 问题，有一些特殊的 html 字符，比如 & ... 但整洁地将 & 这个字符作为空格。

$html_table="<table border="1" bordercolor="#C5CDD2" cellpadding="3" cellspacing="0" class="table">
<tbody>
<tr>
  <td bgcolor="#E9EFF4" colspan="3" valign="top">
    <strong>96270A summary Highlights*</strong>
  </td>
</tr>
<tr>
  <td valign="top" width="101">
    <strong>Frequency/ Level Range</strong>
  </td>
  <td align="center" valign="top" width="239">
    Leveling Head O/P [50 Ω]: 1 mHz to 4 GHz<br>
    Microwave O/P Direct: 1 mHz to 27 GHz [with LL option] Microwave O/P with HF option: 1 kHz to 27 GHz [with LL option]
  </td>
  <td align="center" valign="top" width="264">
    -130 to +24 dBm to 125 MHz,+14 dBm at 4 GHz -4 [-100] to +24 dBm,&gt;1.4 GHz: +20 dBm,[&gt;20 GHz: +18 dBm] -10 [-35] to +18 dBm,&gt;1.4 GHz: +14 dBm,[&gt;20 GHz: +12 dBm]
  </td>
</tr>
<tr>
  <td valign="top" width="101">
    <strong>Power meter readout compatibility</strong>
  </td>
  <td colspan="2" valign="top">
    Rhode & Schwarz NRP-Z series thermal sensor models 51,52,55.03,55.04,56,57 and 58
  </td>
</tr>

";

$html_value = html_entity_decode((string)$value[0]['value'],ENT_QUOTES,'utf-8');

$tidy->parseString($html_value,array("output-xhtml"   => TRUE,"show-body-only" => TRUE,"wrap"           => 0,"quote-ampersand" => TRUE,"new-blocklevel-tags" => "mvt"
                                     ),'utf8'
                  );
$tidy->cleanRepair();

但我无法将 & 值设为“&”。 实际上它在drupal 6 verison中。和整洁的 2.0 版和 PHP 5.6 版