Question

我有多维数组，如下所示：

Array
(
    [0] => Array
        (
            [banner_link] => http://www.eclipse-pos.com/eclipse/images/small_banner2.jpg
        )

    [1] => Array
        (
            [banners] => 143038313801.jpg,143038313809.jpg,143038313811.jpg
        )

    [2] => Array
        (
            [banners] => 143038306301.jpg,143038306302.jpg,143038306303.jpeg,143038306310.jpg,143038306311.jpg,143038306312.png
        )

)

现在我想将banner_link键重命名为banners。

Array
(
    [0] => Array
        (
            [banners] => http://www.eclipse-pos.com/eclipse/images/small_banner2.jpg
        )

    [1] => Array
        (
            [banners] => 143038313801.jpg,143038313809.jpg,143038313811.jpg
        )

    [2] => Array
        (
            [banners] => 143038306301.jpg,143038306302.jpg,143038306303.jpeg,143038306310.jpg,143038306311.jpg,143038306312.png
        )

)

我试过用波纹管代码但没有运气。

foreach ( $getBefamousHomepage as $k=>$v )
{
    $getBefamousHomepage[$k] ['banners'] = $getBefamousHomepage[$k] ['banner_link'];
    unset($getBefamousHomepage[$k]['banner_link']);
}

获取此错误：

Notice: Undefined index: banner_link in /var/www/sitename/application/views/_templates/global_footer.php on line 14

Notice: Undefined index: banner_link in /var/www/sitename/application/views/_templates/global_footer.php on line 14

Array
(
    [0] => Array
        (
            [banners] => http://www.eclipse-pos.com/eclipse/images/small_banner2.jpg
        )

    [1] => Array
        (
            [banners] => 
        )

    [2] => Array
        (
            [banners] => 
        )

)

我做错了什么？

感谢。

Answer 1

banner_link并不总是存在。使用isset()查看是否存在：

if(isset($getBefamousHomepage[$k]['banner_link'])) {
    $getBefamousHomepage[$k]['banners'] = $getBefamousHomepage[$k]['banner_link'];
    unset($getBefamousHomepage[$k]['banner_link']);
}

Answer 2

您应该检查banner_link是否存在。为了避免覆盖banner，您应该检查banner是否已经存在。

foreach ( $getBefamousHomepage as $k=>$v ) {    
    if(isset($getBefamousHomepage[$k]['banner_link']) && !isset($getBefamousHomepage[$k]['banners'])) {        
        $getBefamousHomepage[$k]['banners'] = $getBefamousHomepage[$k]['banner_link'];
        unset($getBefamousHomepage[$k]['banner_link']);
    }
}

Answer 3

你的代码几乎是好的。您只需添加额外的检查以查看banner_link是否存在如果没有，它会抛出一个通知（如你所见），但代码仍将执行，因此“banner”索引将被设置为null。

代码示例：

foreach ( $getBefamousHomepage as $k=>$v )
{
    if (isset($getBefamousHomepage[$k]['banner_link'])) 
    {
        $getBefamousHomepage[$k] ['banners'] = $getBefamousHomepage[$k] ['banner_link'];
        unset($getBefamousHomepage[$k]['banner_link']);
    }
}

Answer 4

您阵列中的某些元素没有banner_link，并且在您尝试访问它时会引发警告。试试这个：

if(isset($getBefamousHomepage[$k] ['banner_link'])) {

    $getBefamousHomepage[$k] = array("banners" => $getBefamousHomepage[$k] ['banner_link']);

}

php多维数组重命名键不起作用

4 个答案: