PHP SplPriorityQueue isEmpty() Function
The SplPriorityQueue::isEmpty() function is an inbuilt function in PHP that is used to check whether the queue is empty or not.
Syntax:
bool SplPriorityQueue::isEmpty()
Parameters: This function does not accept any parameter.
Return Value: This function returns a boolean value either true or false depending upon the queue is empty or not.
Example 1:
PHP
<?php // Declare empty class class priorityQueue extends SplPriorityQueue { } // Create an object of priority queue $obj = new priorityQueue(); // Use isEmpty() function to check // priority queue is empty or not var_dump( $obj ->isEmpty()); ?> |
Output
bool(true)
Example 2:
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( "Beginner" ,2); $obj ->insert( "GFG" ,1); $obj ->insert( "G4G" ,3); $obj ->insert( 'G' ,4); // Use isEmpty() function to check // priority queue is empty or not var_dump( $obj ->isEmpty()); ?> |
Output
bool(false)
Reference: https://www.php.net/manual/en/splpriorityqueue.isempty.php
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