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PHP | Ds\Stack isEmpty() Function
  • Last Updated : 18 Jan, 2021

The Ds\Stack::isEmpty() function of PHP Ds\Stack class is used to check whether a Stack is empty or not. This method returns a boolean value, True if the Stack is empty otherwise it returns False.

Syntax

bool public Ds\Stack::isEmpty ( void )

Parameter: This function does not accept any parameters.
Return Value: This function returns a boolean value True if the stack is Empty otherwise it returns False.

Below programs illustrate the Ds\Stack::isEmpty() function:

Program 1:  



PHP




<?php
 
// PHP program to illustrate the
// Ds\stack::isEmpty() function
 
// Create a Stack instance
$stack = new \Ds\Stack();
 
// Check if stack is Empty
var_dump($stack->isEmpty());
 
// Pushing elements to Stack
$stack->push("Welcome");
$stack->push("to");
$stack->push("GfG");
 
// Check if stack is Empty again
var_dump($stack->isEmpty());
 
?>

Output

bool(true)
bool(false)

Program 2

PHP




<?php
 
// PHP program to illustrate the
// Ds\stack::isEmpty() function
 
// Create a Stack instance
$stack = new \Ds\Stack();
 
// Check if stack is Empty
var_dump($stack->isEmpty());
 
// Pushing Mixed value elements to Stack
$stack->push("Welcome");
$stack->push("to");
$stack->push("GfG");
$stack->push(10);
$stack->push(5.5);
 
// Check if stack is Empty again
var_dump($stack->isEmpty());
 
?>

Output

bool(true)
bool(false)

Reference: http://php.net/manual/en/ds-stack.isempty.php
 

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