Learn about PHP stack and queue_PHP tutorial

In PHP, arrays are often used as stack (last in first out: LIFO) and queue (first in first out: FIFO) structures. PHP provides a set of functions that can be used to push and pop (stack) and shift and unshift (queue) to operate array elements. Stacks and queues are widely used in practice.
We can take a look at the stack first:

Copy the code The code is as follows:

$ arr = array();
array_push($arr,'aaa');
array_push($arr,'bbb');
$arr.pop();
print_r($arr) ;
?>

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

Copy code The code is as follows:

$arr = array();
array_unshift($arr,' aaa');
array_unshift($arr,'bbb');
print_r($arr);
array_shift($arr);
print_r($arr);
?>

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