PHP实现十六进制颜色随机生成器功能的方法

<?php
function randomColor() {
  $str = &#39;#&#39;;
  for($i = 0 ; $i < 6 ; $i++) {
    $randNum = rand(0 , 15);
    switch ($randNum) {
      case 10: $randNum = &#39;A&#39;; break;
      case 11: $randNum = &#39;B&#39;; break;
      case 12: $randNum = &#39;C&#39;; break;
      case 13: $randNum = &#39;D&#39;; break;
      case 14: $randNum = &#39;E&#39;; break;
      case 15: $randNum = &#39;F&#39;; break;
    }
    $str .= $randNum;
  }
  return $str;
}
$color = randomColor();
echo $color;
?>