PHP -从数组中选取随机值？

$array = array('apple', 'banana', 'orange', 'grape');
$randomKey = array_rand($array);
$randomValue = $array[$randomKey];

$array = array('apple', 'banana', 'orange', 'grape');
shuffle($array);
$randomValue = $array[0];

$array = array('apple', 'banana', 'orange', 'grape');
$randomIndex = mt_rand(0, count($array) - 1);
$randomValue = $array[$randomIndex];