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PHP SplHeap top() Function

  • Last Updated : 24 Mar, 2021

The SplHeap::top() function is an inbuilt function in PHP that is used to display the peek node from the top of the heap.

Generally, the Heap Data Structure is of two types

  • Max-Heap: In a Max-Heap, the key present at the root node must be greatest among the keys present at all of its children. The same property must be recursively true for all sub-trees in that Binary Tree.
  • Min-Heap: In a Min-Heap, the key present at the root node must be minimum among the keys present at all of its children. The same property must be recursively true for all sub-trees in that Binary Tree.

Syntax:

mixed SplHeap::top()

Parameters: This function does not accept any parameter.

Return Value: This function returns the value of the node on the top. 



Below programs illustrate the SplHeap::top() function in PHP.

Example 1:

PHP




<?php 
  
// Create a new empty Min Heap 
$heap = new SplMinHeap(); 
  
// Insert the elements into the heap
$heap->insert('System'); 
$heap->insert('GFG'); 
$heap->insert('ALGO'); 
$heap->insert('C');
$heap->insert('Geeks'); 
$heap->insert('GeeksforGeeks'); 
  
// Display the top element
var_dump($heap->top()); 
  
?>

Output:

string(4) "ALGO"

Example 2:

PHP




<?php 
  
// Create a new empty Max Heap 
$heap = new SplMaxHeap(); 
  
$heap->insert('System'.'<br/>'); 
$heap->insert('GFG'.'<br/>'); 
$heap->insert('ALGO'.'<br/>'); 
$heap->insert('C'.'<br/>');
$heap->insert('Geeks'.'<br/>'); 
$heap->insert('GeeksforGeeks'.'<br/>'); 
  
// Loop to display the current element of heap
for ($heap->top(); $heap->valid(); $heap->next())
{
    echo $heap->current() . "\n";
}
  
?>

Output:

System
GeeksforGeeks
Geeks
GFG
C
ALGO

Reference: https://www.php.net/manual/en/splheap.top.php




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