MemoryQueue.php

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<?php
namespace Elgg\Queue;

class MemoryQueue implements \Elgg\Queue\Queue {

    /* @var array */
    protected $queue = array();

    public function __construct() {
        $this->queue = array();
    }

    public function enqueue($item) {
        return (bool)array_push($this->queue, $item);
    }

    public function dequeue() {
        return array_shift($this->queue);
    }

    public function clear() {
        $this->queue = array();
    }

    public function size() {
        return count($this->queue);
    }
}