来自foreach的php随机顺序 [英] php random order from a foreach

问题描述

我有一些 foreach，这可以很好地工作

I have some foreach, this could work well

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

现在我想洗牌 foreach.我试过了:

Now I want shuffle the foreach. I tried:

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;
}

所有这些都导致了 Warning: Invalid argument provided for foreach() 在第二个 foreach 中.如何从 foreach 中随机排序?

All these caused Warning: Invalid argument supplied for foreach() in second foreach. How to random order from a foreach?

推荐答案

查看 shuffle().它接受一个对数组的 reference 并将其改组到位.所以需要在数组上使用，然后迭代:

Take a look at the documentation for shuffle(). It takes a reference to an array and shuffles it in place. So you need to use it on the array, then iterate:

shuffle($umm);

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

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