The isEmpty() Function of Ds\PriorityQueue class in PHP is used to whether a particular PriorityQueue instance is empty or not. It returns True if the PriorityQueue is empty otherwise it returns False.
Syntax:
bool isEmpty( )
Parameters: This function does not accepts any parameters.
Return Value: This function returns a boolean value based on whether this PriorityQueue is empty or not. It returns True if the PriorityQueue is empty otherwise it returns False.
Below programs illustrate the above method:
Program 1:
<?php // Declare new PriorityQueue $pq = new \Ds\PriorityQueue();
// Initially PriorityQueue is Empty var_dump( $pq ->isEmpty());
// Add elements to the PriorityQueue $pq ->push( "One" , 1);
$pq ->push( "Two" , 2);
$pq ->push( "Three" , 3);
// Check again if the PriorityQueue // is Empty var_dump( $pq ->isEmpty());
?> |
bool(true) bool(false)
Program 2:
<?php // Declare new PriorityQueue $pq = new \Ds\PriorityQueue();
// Initially PriorityQueue is Empty var_dump( $pq ->isEmpty());
// Add elements to the PriorityQueue $pq ->push( "Geeks" , 1);
$pq ->push( "for" , 2);
$pq ->push( "Geeks" , 3);
// Check again if the PriorityQueue // is Empty var_dump( $pq ->isEmpty());
?> |
bool(true) bool(false)
Reference: http://php.net/manual/en/ds-priorityqueue.isempty.php