PHP 随机颜色生成

/**
* 随机颜色生成
* @author LJ
* @date 2017-02-09
*/
function randomColor() {
// 颜色 例:#866573
$str = '#';
for($i = 0 ; $i < 6 ; $i++) {
$randNum = rand(0 , 15);
switch ($randNum) {
case 10:
$randNum = 'A';
break;
case 11:
$randNum = 'B';
break;
case 12:
$randNum = 'C';
break;
case 13:
$randNum = 'D';
break;
case 14:
$randNum = 'E';
break;
case 15:
$randNum = 'F';
break;
}
$str .= $randNum;
}
return $str;
}
$color = randomColor();