​PHP怎么输出JS格式化字符串

function jsoutputformat ($str)
{
$str = trim ($str);
$str = str_replace ('\\s\\s', '\\s', $str);
$str = str_replace (chr(10), '', $str);
$str = str_replace (chr(13), '', $str);
$str = str_replace ('', '', $str);
$str = str_replace ('\\', '\\\\', $str);
$str = str_replace ('"', '\\"', $str);
$str = str_replace ('\\\'', '\\\\\'', $str);
$str = str_replace ("'", "\'", $str);
return $str;
}

$output = '
<table width="100%">
<tr class="head">
<td width="50%">中国</td>
<td>中华人民共和国</td>
</tr>
</table>
&#39;;
$output = jsoutputformat($output);
echo "document.write(\"$output\");";

 document.write("<table width=\"100%\"><tr class=\"head\"><td width=\"50%\">中国</td><td>中华人民共和国</td></tr></table>");