我应该使用什么mysqli功能？

Question

我正在尝试从表中提取数据,并使用此:

 $online = mysqli_fetch_field(mysqli_query($db, 
      "SELECT `online` FROM `tbl_system` WHERE `property` = 'extranet'")); 

但是,它没有像回声那样$online给出"数组".

这是$ online的var_dump

object(stdClass)#3 (11) { 
               ["name"]=> string(6) "online" 
               ["orgname"]=> string(6) "online" 
               ["table"]=> string(10) "tbl_system" 
               ["orgtable"]=> string(10) "tbl_system" 
               ["def"]=> string(0) "" 
               ["max_length"]=> int(1) 
               ["length"]=> int(11) 
               ["charsetnr"]=> int(63) 
               ["flags"]=> int(36865) 
               ["type"]=> int(3) 
               ["decimals"]=> int(0) } 

Answer 1

请尝试以下功能之一:

• mysqli_fetch_array - 将结果行提取为关联行,数字数组或两者

  $row = mysqli_fetch_array($result);
  echo $row[0]; // or
  echo $row['online'];
  

• mysqli_fetch_assoc - 将结果行作为关联数组获取

  $row = mysqli_fetch_assoc($result);
  echo $row['online'];
  

• mysqli_fetch_object - 返回结果集的当前行作为对象

  $row = mysqli_fetch_object($result);
  echo $row->online;
  

• mysqli_fetch_row - 获取结果行作为枚举数组

  $row = mysqli_fetch_row($result);
  echo $row[0];
  

随着$result:

$result = mysqli_query($db, "SELECT `online` FROM `tbl_system` WHERE `property` = 'extranet'");