How to use Ds\Queue pop() function in PHP?

This article will introduce to you how to use the Ds\Queue pop() function in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

DsQueue::pop() function in PHP is used to remove and return the value that appears at the top of the queue. In other words, it returns the value that appears at the front of the queue and removes it from the queue.

The syntax is as follows:

mixed public DsPriorityQueue::pop ( void )

Parameters: This function does not accept any parameters.

Return value: This function returns the current value at the top of the Queue. The return type of the function is mixed and depends on the type of value stored in the queue.

Exception Note: If the Queue is empty, this function throws UnderflowException.

The following program illustrates the function of DsQueue::pop() in PHP:

Program 1:

<?php 
  
// Declare new Queue 
$q = new DsQueue(); 
  
// Add elements to the Queue
$q ->push( "One" );
$q ->push( "Two" );
$q ->push( "Three" );
  
echo "Initial Queue is: n" ;
print_r( $q );
  
// Pop an element
echo "nPopped element is: " ;
print_r( $q ->pop());
  
echo "nnFinal Queue is: n" ;
print_r( $q );
  
?>

The output is as follows:

Initial Queue is: 
DsQueue Object
(
    [0] => One
    [1] => Two
    [2] => Three
)

Popped element is: One

Final Queue is: 
DsQueue Object
(
    [0] => Two
    [1] => Three
)

Program 2 :

<?php 
  
// Declare new Queue
$q = new DsQueue(); 
  
// Add elements to the Queue
$q ->push( "Geeks" );
$q ->push( "for" );
$q ->push( "Geeks" );
  
echo "Initial Queue is: n" ;
print_r( $q );
  
// Pop an element
echo "nPopped element is: " ;
print_r( $q ->pop());
  
echo "nnFinal Queue is: n" ;
print_r( $q );
  
?>

The output is as follows:

Initial Queue is: 
DsQueue Object
(
    [0] => Geeks
    [1] => for
    [2] => Geeks
)

Popped element is: Geeks

Final Queue is: 
DsQueue Object
(
    [0] => for
    [1] => Geeks
)

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