防止数组选择重复值

Question

我目前有一段从数组中选择随机值的代码，但我想防止它选择重复的值。我如何才能做到这一点？这是我到目前为止的代码：

$facilities = array("Blu-ray DVD Player","Chalk board","Computer", "Projector",
"Dual data projector", "DVD/Video");

for($j = 0; $j < rand(1, 3); $j++)
   {
    $fac =  print $facilities[array_rand($facilities, 1)] . '<br>'; 
   } 

Answer 1

我觉得你应该看看array_rand

$facilities = array("Blu-ray DVD Player","Chalk board","Computer","Data projector","Dual data projector","DVD/Video");
$rand = array_rand($facilities, 2);
                                ^----- Number of values you want 

foreach ( $rand as $key ) {
    print($facilities[$key] . "<br />");
}

Answer 2

通过指定要返回的数字作为第二个参数，可以从array_rand()返回多个随机密钥。

$keys = (array) array_rand($facilities, rand(1, 3));
shuffle($keys); // array_rand() returns keys unshuffled as of 5.2.10

foreach ($keys as $key) {
    echo $facilities[$key] . '<br>';
}