I don’t know what stack means. Looking at the code, it seems to be similar to adding an array. What's the difference?
ringa_lee2020-02-28 17:54:45
array_push() Push one or more units to the end of the array (push)
array_pop() Pop the last unit of the array (pop)
https://www.php.cn/php-weizijiaocheng-364112.html
This article is very detailed, you can read it