Sindbad~EG File Manager

<?php
namespace Onedrive;

/*
 * An Object instance is an entity that may be stored in a OneDrive account.
 * There are two types of objects: file or a folder, each of which being a
 * subclass of the Object class.
 *
 * Note that Object instances are only "proxy" to actual OneDrive objects (eg.
 * destroying an Object instance will not delete the actual OneDrive object it
 * is referencing to).
 */
 // Class name changed to Instance from Object because Object reserved keyword in Php 7.2
abstract class Instance {
	// The owning Client instance.
	protected $_client;

	// The unique ID assigned by OneDrive to this object.
	protected $_id;

	// The unique ID assigned by OneDrive to the parent folder of this object.
	private   $_parentId;

	// The name of this object.
	private   $_name;

	// The description of this object.
	private   $_description;

	// The size of this object, in bytes.
	private   $_size;

	// The creation time, in seconds since UNIX epoch.
	private   $_createdTime;

	// The last modification time, in seconds since UNIX epoch.
	private   $_updatedTime;

	/**
	 * Constructor.
	 *
	 * @param  (Client) $client - The Client instance owning this Object instance.
	 * @param  (null|string) $id - The unique ID of the OneDrive object referenced
	 *         by this Object instance.
	 * @param  (array|object) $options - An array/object with one or more of the
	 *         following keys/properties:
	 *           (string) parent_id - The unique ID of the parent OneDrive folder
	 *           of this object.
	 *           (string) name - The name of this object.
	 *           (string) description - The description of this object. May be
	 *           empty.
	 *           (int) size - The size of this object, in bytes.
	 *           (string) created_time - The creation time, as a RFC date/time.
	 *           (string) updated_time - The last modification time, as a RFC
	 *           date/time.
	 *         Default: array().
	 */
	public function __construct(Client $client, $id, $options = array()) {
		$options       = (object) $options;
		$this->_client = $client;
		$this->_id     = null !== $id ? (string) $id : null;

		$this->_parentId = property_exists($options, 'parent_id') ?
			(string) $options->parent_id : null;

		$this->_name = property_exists($options, 'name') ?
			(string) $options->name : null;

		$this->_description = property_exists($options, 'description') ?
			(string) $options->description : null;

		$this->_size = property_exists($options, 'size') ?
			(int) $options->size : null;

		$this->_createdTime = property_exists($options, 'created_time') ?
			strtotime($options->created_time) : null;

		$this->_updatedTime = property_exists($options, 'updated_time') ?
			strtotime($options->updated_time) : null;
	}

	/**
	 * Determines whether the OneDrive object referenced by this Object instance
	 * is a folder.
	 *
	 * @return (bool) true if the OneDrive object referenced by this Object
	 *         instance is a folder, false otherwise.
	 */
	public function isFolder() {
		return false;
	}

	/**
	 * Fetches the properties of the OneDrive object referenced by this Object
	 * instance. Some properties are cached for faster subsequent access.
	 *
	 * @return (array) The properties of the OneDrive object referenced by this
	 *         Object instance.
	 */
	public function fetchProperties() {
		$result = $this->_client->fetchProperties($this->_id);

		$this->_parentId = '' != $result->parentReference['id'] ?
			(string) $result->parentReference['id'] : null;

		$this->_name = $result->name;

		$this->_description = '' != $result->description ?
			(string) $result->description : null;

		$this->_size        = (int) $result->size;
		$this->_createdTime = strtotime($result->createdDateTime);
		$this->_updatedTime = strtotime($result->lastModifiedDateTime);
		return $result;
	}

	/**
	 * Gets the unique ID of the OneDrive object referenced by this Object
	 * instance.
	 *
	 * @return (string) The unique ID of the OneDrive object referenced by this
	 *         Object instance.
	 */
	public function getId() {
		return $this->_id;
	}

	/**
	 * Gets the unique ID of the parent folder of the OneDrive object referenced
	 * by this Object instance.
	 *
	 * @return (string) The unique ID of the OneDrive folder containing the object
	 *         referenced by this Object instance.
	 */
	public function getParentId() {
		if (null === $this->_parentId) {
			$this->fetchProperties();
		}

		return $this->_parentId;
	}

	/**
	 * Gets the name of the OneDrive object referenced by this Object instance.
	 *
	 * @return (string) The name of the OneDrive object referenced by this Object
	 *         instance.
	 */
	public function getName() {
		if (null === $this->_name) {
			$this->fetchProperties();
		}

		return $this->_name;
	}

	/**
	 * Gets the description of the OneDrive object referenced by this Object
	 * instance.
	 *
	 * @return (string) The description of the OneDrive object referenced by this
	 *         Object instance.
	 */
	public function getDescription() {
		if (null === $this->_description) {
			$this->fetchProperties();
		}

		return $this->_description;
	}

	/**
	 * Gets the size of the OneDrive object referenced by this Object instance.
	 *
	 * @return (int) The size of the OneDrive object referenced by this Object
	 *         instance.
	 */
	public function getSize() {
		if (null === $this->_size) {
			$this->fetchProperties();
		}

		return $this->_size;
	}

	/**
	 * Gets the creation time of the OneDrive object referenced by this Object
	 * instance.
	 *
	 * @return (int) The creation time of the object referenced by this Object
	 *         instance, in seconds since UNIX epoch.
	 */
	public function getCreatedTime() {
		if (null === $this->_createdTime) {
			$this->fetchProperties();
		}

		return $this->_createdTime;
	}

	/**
	 * Gets the last modification time of the OneDrive object referenced by this
	 * Object instance.
	 *
	 * @return (int) The last modification time of the object referenced by this
	 *         Object instance, in seconds since UNIX epoch.
	 */
	public function getUpdatedTime() {
		if (null === $this->_updatedTime) {
			$this->fetchProperties();
		}

		return $this->_updatedTime;
	}

	/**
	 * Moves the OneDrive object referenced by this Object instance into another
	 * OneDrive folder.
	 *
	 * @param  (null|string) The unique ID of the OneDrive folder into which to
	 *         move the OneDrive object referenced by this Object instance, or
	 *         null to move it to the OneDrive root folder. Default: null.
	 */
	public function move($destinationId = null) {
		$this->_client->moveObject($this->_id, $destinationId);
	}
}