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PHP SplHeap extract() Function

  • Last Updated : 23 Mar, 2021

The SplHeap::extract() function is an inbuilt function in PHP which is used to extract a node from top of the heap and sift up.

Generally, the Heap Data Structure are 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::extract()

Parameters: This function does not accept any parameter.

Return Value: This function returns the value of the extracted node.



Below programs illustrate the SplHeap::extract() function in PHP:

Example 1:

PHP




<?php 
  
// Create a new empty Min Heap 
$heap = new SplMinHeap(); 
  
$heap->insert('System'); 
$heap->insert('GFG'); 
$heap->insert('ALGO'); 
$heap->insert('C');
$heap->insert('Geeks'); 
$heap->insert('GeeksforGeeks'); 
  
echo $heap->extract();
  
?>

Output:

ALGO

Example 2:

PHP




<?php 
  
// Create a new empty Max Heap 
$heap = new SplMaxHeap(); 
  
$heap->insert('System'); 
$heap->insert('GFG'); 
$heap->insert('ALGO'); 
$heap->insert('C');
$heap->insert('Geeks'); 
$heap->insert('GeeksforGeeks'); 
  
echo $heap->extract();
  
?>

Output:

System

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




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