PHP Ds\Queue Functions Complete Reference

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A Queue is a linear data structure that follows a particular order in which the operations are performed. The order of queue is First In First Out (FIFO).

Requirements: PHP 7 is required for both extension and the compatibility polyfill.

Installation: The easiest way to install data structure by using the PECL extension.

pecl install ds

Syntax:

public Ds\Queue::functionname()

Example: Below programs illustrate the Ds\Queue::clear() function in PHP:

PHP

<?php
 
// Declare new Queue
$q = new \Ds\Queue();
 
// Add elements to the Queue
$q->push("One");
$q->push("Two");
$q->push("Three");
 
echo "Initial Queue: \n";
// Display the Queue
print_r($q);
 
// clear the Queue
$q->clear();
 
echo "\nQueue after clearing:\n";
print_r($q);
 
?>

Output:

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

Queue after clearing:
Ds\Queue Object
(
)

Complete list of data structure DS\Queue:

PHP Ds\Queue Functions	Description
allocate()	Allocate memory for a Queue class instance.
capacity()	Check the current capacity of a Queue instance.
clear()	Clear all of the elements from a Queue instance.
copy()	Create a shallow copy of a particular Queue instance.
count()	Get the count of elements present in a Queue instance.
isEmpty()	Whether a particular Queue instance is empty or not.
peek()	Get the value present at the front of a Queue.
pop()	Remove and return the value present at the top of the Queue.
push()	Push or insert values in a PriorityQueue instance.
toArray()	Convert a Queue into an associative array in PHP.