PHP | Ds\Stack peek() Function

The Ds\Stack::peek() function of PHP is used to get the element present at the top of the Stack instance. This function just returns the top element of the stack without removing it from the stack.

Syntax:

mixed public Ds\Stack::peek ( void ) 

Parameters: This function does not accepts any parameters.

Return Value: This function returns the element present at the top of the Stack.

Below programs illustrate the Ds\Stack::peek() function in PHP:



Program 1:

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<?php
  
// PHP program to illustarte the 
// peek() function 
  
// Create a Stack instance
$stack = new \Ds\Stack();
  
// Pushing elements to Stack
$stack->push("Welcome");
$stack->push("to");
$stack->push("GfG");
  
// Print the top element
print_r($stack->peek());
  
?>

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Output:

GfG

Program 2:

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<?php
  
// PHP program to illustarte the 
// peek() function 
  
// Create a Stack instance
$stack = new \Ds\Stack();
  
// Pushing Mixed value elements to Stack
$stack->push("Welcome");
$stack->push("to");
$stack->push("GfG");
$stack->push(10);
$stack->push(5.5);
  
// Print the top element
print_r($stack->peek());
  
?>

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Output:

5.5

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




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