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 accepts 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 program to illustarte the // 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 program to illustarte the // 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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