在while循环中向列表添加字符串 - 不工作？

Question

我正在尝试将字符串添加到变量中，出于某种原因，唯一要考虑的部分是“
服务：”部分。

知道为什么会这样吗？

$lists = "<br />Services: ";

$servicearray = mysql_query("select serv_id from org_serv_xref where org_id='".$orgid."'");

while ($servicearrayrow = mysql_fetch_array($servicearray)) {
    $servdescarray = mysql_query("select serv_desc from service where serv_id='".$servicearrayrow['serv_id']."'");

    $lists . "<ul>";

while ($servdescarrayrow = mysql_fetch_array($servdescarray)) {
       $lists . "<li>" . $servdescarrayrow['serv_desc'] . "</li>";
      }
      $lists . "</ul>";
}

Answer 1

那是因为当你想要连接字符串时，你必须仍然使用=符号，这使得连续符号像.=

您的代码必须如下所示：

while ($servicearrayrow = mysql_fetch_array($servicearray)) 
{
    $servdescarray = mysql_query("select serv_desc from service where serv_id='".$servicearrayrow['serv_id']."'");
    $lists .= "<ul>";

    while ($servdescarrayrow = mysql_fetch_array($servdescarray)) 
    {
        $lists .= "<li>" . $servdescarrayrow['serv_desc'] . "</li>";
    }
    $lists .= "</ul>";
}