return false;
}
}
function First()
{
return $this->stackArray[$this->index];
}
function Last()
{
return $this->stackArray[0];
}
public function getElement($position)
{
if ($position <= $this->index + 1) {
$arrayPosition = $this->index + 1 - $position;
return $this->stackArray[$arrayPosition];
} else {
echo "Invalid";
}
}
}
$myStack = new Stack();
$myStack->push(1);
$myStack->push(4);
$myStack->push(5);
echo "First pop is ", $myStack->pop(), "<br>";
echo "Second pop is ", $myStack->pop(), "<br>";
echo "First value of stack is ", $myStack->First(), "<br>";
$myStack->pop();
echo "present index value is ", $myStack->getElement(2);
echo "stack is empty";
}
}
public function isEmpty()
{
if ($this->index == -1) {
return true;
} else {
return false;
}
}
public function first()
{
echo $this->stackArray[$this->index];
}
public function last()
{
echo $this->stackArray[0];
}
}
$newStack = new Stack();
$newStack->push(2);
$newStack->push(6);
$newStack->pop();
$newStack->pop();
$newStack->pop();
$newStack->isEmpty();
$newStack->first();
$newStack->last();
$newStack->getElement(1);
