＆安培;＆安培;在while循环中没有返回第一个函数

Question

以下代码仅返回第二个回声，如果我删除&& $fetch_desc = mysql_fetch_array($select_desc)，则第一个回声正在工作，否则只显示第二个回声。

有任何线索如何处理？感谢。

$select_name = mysql_query("query1");
$select_desc = mysql_query("query2");
      while($fetch_name = mysql_fetch_array($select_name) && $fetch_desc = mysql_fetch_array($select_desc)){
      echo $fetch_name['field_value'];
      echo $fetch_desc['field_value'];
      }

Answer 1

尝试：

while(($fetch_name = mysql_fetch_array($select_name)) && ($fetch_desc = mysql_fetch_array($select_desc))){

可能是因为条件变得混乱，括号会阻止这种情况发生。