php函数array_rand

Question

这段代码从$vec数组中选择2-6个音高。我想回显每个单独的音高，但有趣的是，它给了我在数组中的音高位置的数值(即:2，5，6而不是D，F，F#)

  $pick = rand(2,6);
  $vec = array("C","C#","D","D#","E","F","F#","G","G#","A","A#","B");
  $random_keys = array_rand($vec,$pick);
  foreach ($random_keys as $pitch){
  echo $pitch; echo "<br>";
  }

为什么它要这样做，我如何才能得到的投球而不是数字？

Answer 1

试试这个：

$pick = rand(2,6);
$vec = array("C","C#","D","D#","E","F","F#","G","G#","A","A#","B");
$random_keys = array_rand($vec, $pick);
foreach ($random_keys as $key) {
  echo $vec[$key], '<br />';
}

来自array_rand()文档：

返回值

如果只选择一个条目，array_rand()将返回随机条目的密钥。否则，它将返回随机条目的键数组。这样就可以从数组中选择随机键和值。