Question

此代码从$ vec数组中选择2-6个音高。我想回应每个单独的音高，但有趣的是，它给出了数组中音高位置的数值（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>";
  }

为什么要这样做？我怎样才能得到音高而不是数字呢？

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（）将返回随机条目的键。否则，它返回随机条目的键数组。这样做是为了您可以从数组中选择随机键和值。

与foreach的php array_rand函数

1 个答案: