如何检测指定元素是否在Redis list中？

$listKey = 'mylist';
// 测试 LPOS 命令
$searchElement = 'apple';
// 客户端为 phpreids
// $position = Redis::lPos($listKey, $searchElement);
// 客户端为 predis
$position = Redis::executeRaw(['LPOS', $listKey, $searchElement]);
if ($position !== false) {
    echo "Element '$searchElement' found at position: $position\n";
} else {
    echo "Element '$searchElement' not found\n";
}