相关疑难解决方法(0)

我有一些foreach,这可能会很好

foreach ($umm as $data) {
        echo '<img src="'.$data->picture.'" />';
        echo  $data->id;
}

现在我想改变一下foreach.我试过了:

foreach (shuffle($umm) as $data) {
        echo '<img src="'.$data->picture.'" />';
        echo  $data->id;
}

和

foreach ($umm as $data) {
        $rand_pic[] = $data->picture;
        $rand_id[] = $data->id;
}
$ran = shuffle($rand_id);
foreach($ran as $new){
    echo '<img src="'.$new->picture.'" width="100" />';
    echo $new->id;
}

这些Warning: Invalid argument supplied for foreach()都是第二次造成的foreach.如何从foreach随机排序？