使用PHP从MySQL列中删除重复的逗号分隔值

我有一个包含如下列的数据库：

id     options
1      Website,Website,Newspaper,Newspaper,TV,TV,Radio,Radio
2      Website,Website,Newspaper,Newspaper
3      Website,Website,TV,TV

目标是删除重复的条目并将选项列标准化为：

id     options
1      Website,Newspaper,TV,Radio
2      Website,Newspaper
3      Website,TV

我开发了以下PHP代码：

$sql = "SELECT id, options FROM table";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
    // output data of each row
    while($row = $result->fetch_assoc()) {
        $id = $row['id'];
        $values_array = explode( ',' , $row['options'] );
        if(count($values_array) != count(array_unique($values_array)))
        {
            $likes = array_unique($values_array);
            $new = implode(',', $likes);
            $sql = "UPDATE table SET options=".$new." WHERE id = '$id'";
        }
    }
} else {
    echo "0 results";
}
$conn->close();

这不能完成工作.一切似乎都有效,但尝试使用新的数组数据更新选项列.

这似乎并不太难,只是寻找一些如何使其工作的指导.

提前致谢！

解决方法:

试试这个：

$sql = "SELECT id, options FROM table";
$result = $conn->query($sql);

if ($result->num_rows > 0) {
// output data of each row
    while ($row = $result->fetch_assoc()) {
        $id = $row['id'];
        $values_array = explode(',', $row['options']);
        if (count($values_array) != count(array_unique($values_array))) {
            $likes = array_unique($values_array);
            $new = implode(',', $likes);
            $sql = "UPDATE table SET options=" . $new . " WHERE id = '$id'";
            /* seems you missed this */
            if ($conn->query($sql) === TRUE) {
                echo "Record updated successfully";
            } else {
                echo "Error updating record: " . $conn->error;
            }
            /* you declared sql query but not executed it */
        }
    }
} else {
    echo "0 results";
}
$conn->close();

希望它有用:)