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
$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
$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
Share your thoughts in the comments
Please Login to comment...