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PHP Ds / PriorityQueue isEmpty () function

Syntax :
bool isEmpty() 
Parameters : This function takes no parameters.Return Value : This function returns a boolean value depending on whether the PriorityQueue is empty or not. It returns True if the PriorityQueue is empty, otherwise it returns False.The following programs illustrate the above method:Program 1 :  
// Declare a new PriorityQueue $pq = new DsPriorityQueue();  
// Initially PriorityQueue is empty var_dump ( $pq -> isEmpty());  
// Add items to PriorityQueue $pq -> push ( "One" , 1); $pq -> push ( "Two" , 2); $pq -> push ( "Three" , 3);  
// Check again if PriorityQueue
// empty var_dump ( $pq -> isEmpty());  
?>
Exit:
bool (true ) bool (false) 
Program 2:  
// Declare a new PriorityQueue $pq = new DsPriorityQueue();  
// Initially PriorityQueue is empty var_dump ( $pq -> isEmpty());  
// Add items to PriorityQueue $pq -> push ( "Geeks" , 1); $pq -> push ( "for" , 2); $pq -> push ( "Geeks" , 3);  
// Check again if PriorityQueue
// empty var_dump ( $pq -> isEmpty());  
?>
Exit:
bool (true ) bool (false) 
Link : http://php.net/manual/en/ds-priorityqueue.isempty.php

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