PHP SplHeap top() Function
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'); $heap->insert('GeeksforGeeks'); // Display the top elementvar_dump($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/>'); $heap->insert('GeeksforGeeks'.'<br/>'); // Loop to display the current element of heapfor ($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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