How to use PHP Stack and queue

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Arrays are often used as stack (last-in, first-out: LIFO) and queue (first-in, first-out: FIFO) structures in PHP. PHP provides a set of functions that can be used for push and pop (stack) and shift and unshift (queue) to manipulate array elements. Stack and queue are widely used in practice.

We can take a look at the stack first:

The code is as follows:

If you plan to use the array as a queue (FIFO), you can use array_unshift () to add elements and array_shift () to delete:

The code is as follows:

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