PHP array_rand() 函数随机输出数组内容

<?php
$a=array("red","green","blue","yellow","brown");
$random_keys=array_rand($a,3);
echo $a[$random_keys[0]]."<br>";
echo $a[$random_keys[1]]."<br>";
echo $a[$random_keys[2]];
?>

https://www.w3school.com.cn/php/func_array_rand.asp