检查数组是否首先存在，如果不存在，则创建它...然后添加元素，知道该数组肯定会在之前定义手:

Check if the array exists first, and if it doesn't, create it...then add the element, knowing that the array will surely be defined before hand :

if (!isset($myArray)) {
    $myArray = array();
}

array_push($myArray, 'my message');