CancioLabs / DS / PHP-Stack

This tiny package contains an interface and an array-based implementation of the LIFO Stack data structure.

Interface

Method	Description
push	Adds a new element to the top of the stack.
pop	Removes and return the top element of the stack.
top	Returns the top element of the stack.
isEmpty	Tests whether the stack is empty.
clear	Removes all elements from the stack.
count	Returns the number of elements of the stack.
toArray	Transforms the stack into an array.

How to use it

$stack = new Stack(['A', 'B']);

$stack->push('C');
$stack->push('D');

$stack->isEmpty(); // returns false
$stack->count(); // returns 4

$stack->top(); // output 'D'
$stack->pop(); // returns 'D'

$array = $stack->toArray(); // return ['A', 'B', 'C']

foreach ($stack as $element) {
    // i=0: $element = 'C'
    // i=1: $element = 'B'
    // i=2: $element = 'A'
}

$stack->isEmpty(); // returns true 

Tests and Coverage

All tests are passing with no warnings and code coverage is 100%.