来自foreach的php随机顺序

Question

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;
}

所有这些导致Warning: Invalid argument supplied for foreach()在第二foreach。如何从foreach随机排序？

Answer 1

看看the documentation for shuffle()。它需要引用一个数组并将其混洗到位。所以你需要在数组上使用它，然后迭代：

shuffle($umm);

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

Answer 2

shuffle()返回一个布尔值 - 您通过引用传递数组

试试这个：

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

Answer 3

试试这个Shuffle：

<?php 
   shuffle($umm);
   foreach($umm as $key => $value): ?>
	<img src="<?php echo $value->picture; ?>" alt="<?php echo $value->title;?>" />
	<?php echo $value->id;?>	  
<?php endforeach; ?>