The SplPriorityQueue::key() function is an inbuilt function in PHP that is used to return the current node index.
Syntax:
mixed SplPriorityQueue::key()
Parameters: This function does not accept any parameter.
Return Value: This function returns the current node index.
Example:
PHP
<?php // Declare a class class priorityQueue extends SplPriorityQueue { // Compare function to compare priority // queue elements public function compare($p1, $p2) { if ($p1 === $p2) return 0; return $p1 < $p2 ? -1 : 1; } } // Create an object of priority queue $obj = new priorityQueue(); // Insert elements into the queue $obj->insert("Geeks",2); $obj->insert("GFG",1); $obj->insert("G4G",3); $obj->insert('G',4); // Use key() function to get the // current key of priority queue var_dump($obj->key()); ?> |
Output
int(3)
Reference: https://www.php.net/manual/en/splpriorityqueue.key.php
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