如果另一个字段为空，如何回显另一个字段？

我成功地将图像和视频都回送到引导旋转木马中。然而，当帖子中没有图片时，我遇到了一个问题。如果没有图像，则没有class=“item active”，因此引导转盘将不会显示。

这是我的解决方法，我感觉我就快到了，有人能帮我一下吗？

<?php $myCarousel = get_order_field(\'projectdetails_image\'); // use the Custom Group name 
        if( !empty( $myCarousel )) {
                foreach($myCarousel as $carousel){
                            if ($counter == 0) {
                                echo "<div class=\'item active\'>";
                                echo \'<img src="\';
                                echo get(\'projectdetails_image\',1,$carousel);
                                echo \'"/>\';
                                echo "</div>";
                            }
                            else{
                                echo "<div class=\'item\'>";
                                echo \'<img src="\';
                                echo get(\'projectdetails_image\',1,$carousel);
                                echo \'"/>\';
                                echo "</div>";
                            }
                            $counter++;

                $videos = get_order_field(\'video_vimeo\');
                foreach($videos as $video){
                    if ( get(\'video_vimeo\',TRUE) ) {
                            echo "<div class=\'item black\'><div id=\'video-wrap\'>";
                            echo get(\'video_vimeo\',1,$video);
                            echo "</div></div>";
                    }
                    else {}
                }
                }   
        }
        else{            
                $videos = get_order_field(\'video_vimeo\');
                foreach($videos as $video){
                    if ( get(\'video_vimeo\',TRUE) ) {
                            echo "<div class=\'item active black\'><div id=\'video-wrap\'>";
                            echo get(\'video_vimeo\',1,$video);
                            echo "</div></div>";
                    }
                    else {}
                }   
        }?>

终于明白了：

    <?php $myCarousel = get_order_field(\'projectdetails_image\'); // use the Custom Group name 
if( !empty( $myCarousel )) {
        foreach($myCarousel as $carousel){
        $myimg = get(\'projectdetails_image\',1,$carousel);
        if ( !$myimg ) {
        $videos = get_order_field(\'video_vimeo\');
        foreach($videos as $video){
            if ( get(\'video_vimeo\',TRUE) ) {
                    echo "<div class=\'item active black\'><div id=\'video-wrap\'>";
                    echo get(\'video_vimeo\',1,$video);
                    echo "</div></div>";
            }
            else {}
        }   
        }
        if ( $myimg ) {
            echo "<div class=\'item".( $counter == 0 ? \' active\' : \'\' )."\'>";
            echo \'<img src="\';
            echo $myimg;
            echo \'"/>\';
            echo "</div>";
            $counter++;

            $videos = get_order_field(\'video_vimeo\');
            foreach($videos as $video){
            if ( get(\'video_vimeo\',TRUE) ) {
                echo "<div class=\'item black\'><div id=\'video-wrap\'>";
                echo get(\'video_vimeo\',1,$video);
                echo "</div></div>";
            }}
        }
    }
}
else{            
        $videos = get_order_field(\'video_vimeo\');
        foreach($videos as $video){
            if ( get(\'video_vimeo\',TRUE) ) {
                    echo "<div class=\'item active black\'><div id=\'video-wrap\'>";
                    echo get(\'video_vimeo\',1,$video);
                    echo "</div></div>";
            }
            else {}
        }   
}?>

foreach($myCarousel as $carousel){ $myimg = get(\'projectdetails_image\',1,$carousel); if ( !$myimg ) { // use this if you want to show a default image when no image is available in the post $myimg = get_template_directory_uri().\'/images/default_banner.jpg\'; } if ( $myimg ) { echo "<div class=\'item".( $counter == 0 ? \' active\' : \'\' )."\'>"; echo \'<img src="\'; echo $myimg; echo \'"/>\'; echo "</div>"; $counter++; $videos = get_order_field(\'video_vimeo\'); foreach($videos as $video){ if ( get(\'video_vimeo\',TRUE) ) { echo "<div class=\'item black\'><div id=\'video-wrap\'>"; echo get(\'video_vimeo\',1,$video); echo "</div></div>"; } } } }

注意：未定义的索引：在Options-Framework.php中

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注意：未定义的索引：在Options-Framework.php中