Initial Drupal 11 with DDEV setup

vendor/phootwork/collection/Queue.php

@@ -0,0 +1,65 @@
+<?php declare(strict_types=1);
+/**
+ * This file is part of the Phootwork package.
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @license MIT License
+ * @copyright Thomas Gossmann
+ */
+namespace phootwork\collection;
+
+use Iterator;
+
+/**
+ * Represents a Queue
+ * 
+ * FIFO - first in first out
+ * 
+ * @author Thomas Gossmann
+ */
+class Queue extends AbstractList {
+	/**
+	 * Creates a new Queue
+	 * 
+	 * @param array|Iterator $collection
+	 */
+	public function __construct(array|Iterator $collection = []) {
+		$this->enqueue(...$collection);
+	}
+
+	/**
+	 * Enqueues an element
+	 * 
+	 * @param mixed ...$elements
+	 *
+	 * @return $this
+	 */
+	public function enqueue(mixed ...$elements): self {
+		array_unshift($this->array, ...$elements);
+
+		return $this;
+	}
+
+	/**
+	 * Returns the element at the head or null if the queue is empty but doesn't remove that element  
+	 * 
+	 * @return mixed
+	 */
+	public function peek(): mixed {
+		if ($this->size() > 0) {
+			return $this->array[0];
+		}
+
+		return null;
+	}
+
+	/**
+	 * Removes and returns the element at the head or null if the is empty
+	 * 
+	 * @return mixed
+	 */
+	public function poll(): mixed {
+		return array_shift($this->array);
+	}
+}