使用 for 循环进行多个 mysqli 查询

Question

我试图通过循环遍历数组的值（称为列）来进行一系列 mysqli 查询，但没有返回任何内容。

for ($i = 0; $i < sizeof($column); $i++)

{
    $mutualInterests = mysqli_query ($conn, "SELECT USER_1 FROM INTERESTS WHERE answer = " . $column[$i] );

    while ($row = mysqli_fetch_array ($mutualInterests))

    {
        echo " $row[USER_1]";

    }


}

Answer 1

替换这个：

while ($row = mysqli_fetch_array ($mutualInterests))

{
    echo " $row[USER_1]";

}

有了这个：

$count = 0;
while ($row = mysqli_fetch_array ($mutualInterests))
{
    echo $row[$count]."<br>";
    $count++;

}

让我知道它现在是否有效！ :)

Answer 2

只需用以下内容替换给定的代码并查看结果.........

$query='SELECT USER_1 FROM INTERESTS WHERE answer ="'.$column[0].'"';

for ($i = 1; $i < sizeof($column); $i++)

{
$query.=' OR answer ="'.$column[$i].'"';

}

$mutualInterests = mysqli_query ($conn,$query);

while ($row = mysqli_fetch_array ($mutualInterests))

{
    echo " $row[USER_1]";

}