PHP Ds / Queue peek () Function

Syntax:
mixed public DsQueue::peek (void)
Parameters: This function takes no parameters.Return Value:This function returns the value at the head of this queue. The return type of the function is mixed and depends on the type of the value stored in the queue.Exception : This function throws a exceptionUnderflowException if the queue is empty. The programs below illustrate the Ds / Queue::peek()function in PHPProgram 1:
// Declare a new queue $q = new DsQueue();
// Add items to the queue $q -> push ( "One" ); $q -> push ( "Two" ); $q -> push ( "Three" ); echo " Queue is: " ; print_r ( $q );
// Get element in front echo "Element at front is:" ; print_r ( $q -> peek());
?>
Exit:
Queue is: DsQueue Object ([0] = > One [1] = > Two [2] = > Three) Element at front is: One
Program 2:
// Declare a new queue $q = new DsQueue(); echo " Queue is: " ; print_r ( $q );
// Get element in front echo "Element at front is:" ; print_r ( $q -> peek());
?>
Exit:
PHP Fatal error : Uncaught UnderflowException
Link: http : //php.net/manual/en/ds-priorityqueue.peek.php

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