How to select a random value from an array in PHP?

Question

I have an array of objects in PHP. I need to randomly select 8 of them. My initial thought was to use array_rand(array_flip($my_array), 8), but this doesn't work because objects cannot be keys to arrays.

I know I could use shuffle, but I'm worried about performance getting worse as the array grows. Is this the best way, or is there a more efficient way?

Answer 1

$array = array();
shuffle($array); // 随机排列数组项的顺序
$newArray = array_slice($array, 0, 8);

Note that the shuffle() function passes arguments as references and changes them.

Answer 2

$result = array();
foreach( array_rand($my_array, 8) as $k ) {
  $result[] = $my_array[$k];
}