php - 需要帮助显示最后 5 行。 PHP、MySQL

Question

谁能告诉我我做错了什么。我想按降序显示最后 5 行。

$pull_activity_logs = mysql_query("SELECT * FROM activity_logs WHERE ac_no = '$logined_acc' order by id desc       limit 0,5") 
or die(mysql_error());  
while($row = mysql_fetch_array( $pull_activity_logs )) {
$activity_time = $row["datetime"];
$activity = $row["activity"];
}
echo "$activity";

非常感谢您的帮助

Answer 1

好吧，您始终可以按 asc 顺序选择前五个，这将是按 desc 顺序的最后五个，然后如果需要，您可以在 php 中反转它们的顺序(5 个值并不是数组无法处理的)

代码:

$pull_activity_logs = mysql_query("SELECT * FROM activity_logs WHERE ac_no = '$logined_acc' order by id asc limit 5"); 
$temp_arr = array();
while($row = mysql_fetch_array( $pull_activity_logs )) {
  $temp_arr[] = $row; //add to end
}
$final_arr = array_reverse($temp_arr);
foreach($final_arr as $row) //this doesn't have to be named $row
  $activity_time = $row["datetime"];
  $activity = $row["activity"];
  echo "$activity";
}

编辑:

现在当我看它时，也许整个问题出在你的 echo 的扭曲位置:

$pull_activity_logs = mysql_query("SELECT * FROM activity_logs WHERE ac_no = '$logined_acc' order by id desc limit 0,5") 
or die(mysql_error());  
while($row = mysql_fetch_array( $pull_activity_logs )) {
  $activity_time = $row["datetime"];
  $activity = $row["activity"];
echo "$activity"; //this goes INSIDE the loop
}