我正在尝试循环一个mysql查询，并在新行中显示每个结果。我知道我错过了一些图片，我需要在mysql中设置变量吗？
$value = array(B1,B2,B3,B4);
$query = "SELECT SUM($value[0]) AS ".$value[0]."_SUM, "
."SUM(answer_value) AS ".$value[0]."_ANSWER_SUM "
."FROM questions q JOIN answers a ON q.question_id = a.question_id "
."WHERE $value[0]=1";
$result = mysqli_query($con, $query);
while($row = mysqli_fetch_array($result)) {
echo "<tr><td>".$value[0]."</td>";
echo "<td>".$row['B1_ANSWER_SUM']."</td>";
echo "<td>".$row['B1_SUM'] ."</td>";
echo '</tr>' ;
}
我想得到这个结果：
B1 B1_ANSWER_SUM B1_SUM
B2 B2_ANSWER_SUM B2_SUM
B3 B2_ANSWER_SUM B2_SUM
您需要循环遍历数组并查询数组中的每个项。见下文：
$value = array('B1', 'B2', 'B3', 'B4');
foreach ($value as $v) {
$query = "SELECT SUM($v) AS ".$v."_SUM, SUM(answer_value) AS ".$v."_ANSWER_SUM FROM questions q JOIN answers a ON q.question_id = a.question_id WHERE $v=1";
$result = mysqli_query($con, $query);
while($row = mysqli_fetch_array($result)) {
echo "<tr><td>".$v."</td>";
echo "<td>".$row[$v.'_ANSWER_SUM']."</td>";
echo "<td>".$row[$v.'_SUM'] ."</td>";
echo '</tr>' ;
}
}