Beginnings of a Firestore CRUD Library for PHP

php

<?php

namespace PHPFireStore {

	class FireStoreDocument {

		private $fields = [];
		private $name = null;
		private $createTime = null;
		private $updateTime = null;

		/**
		Example:
		{
		 "name": "projects/{project_id}/databases/(default)/documents/{collectionName}/{documentId}",
		 "fields": {
		  "hello": {
		   "doubleValue": 3
		  }
		 },
		 "createTime": "2017-10-18T21:27:33.186235Z",
		 "updateTime": "2017-10-18T21:27:33.186235Z"
		}
		*/
		public function __construct($json=null) {
			if ($json !== null) {
				$data = json_decode($json, true, 16);
				// Meta properties
				$this->name = $data['name'];
				$this->createTime = $data['createTime'];
				$this->updateTime = $data['updateTime'];
				// Fields
				foreach ($data['fields'] as $fieldName => $value) {
					$this->fields[$fieldName] = $value;
				}
			}
		}

		public function getName() {
			return $this->name;
		}

		public function setString($fieldName, $value) {
			$this->fields[$fieldName] = [
				'stringValue' => $value
			];
		}

		public function setDouble($fieldName, $value) {
			$this->fields[$fieldName] = [
				'doubleValue' => floatval($value)
			];
		}

		public function setArray($fieldName, $value) {
			$this->fields[$fieldName] = [
				'arrayValue' => $value
			];
		}

		public function setBoolean($fieldName, $value) {
			$this->fields[$fieldName] = [
				'booleanValue' => !!$value
			];
		}

		public function setInteger($fieldName, $value) {
			$this->fields[$fieldName] = [
				'integerValue' => intval($value)
			];
		}

		public function get($fieldName) {
			if (array_key_exists($fieldName, $this->fields)) {
				return reset($this->fields);
			}
			throw new Exception('No such field');
		}

		public function toJson() {
			return json_encode([
				'fields' => $this->fields
			]);
		}

	}

	class FireStoreApiClient {

		private $apiRoot = 'https://firestore.googleapis.com/v1beta1/';
		private $project;
		private $apiKey;

		function __construct($project, $apiKey) {
			$this->project = $project;
			$this->apiKey = $apiKey;
		}

		private function constructUrl($method, $params=null) {
			$params = is_array($params) ? $params : [];
			return (
				$this->apiRoot . 'projects/' . $this->project . '/' .
				'databases/(default)/' . $method . '?key=' . $this->apiKey . '&' . http_build_query($params)
			);
		}

		private function get($method, $params=null) {
			$curl = curl_init();
			curl_setopt_array($curl, array(
			    CURLOPT_RETURNTRANSFER => 1,
			    CURLOPT_URL => $this->constructUrl($method, $params),
			    CURLOPT_USERAGENT => 'cURL'
			));
			$response = curl_exec($curl);
			curl_close($curl);
			return $response;
		}

		private function post($method, $params, $postBody) {
			$curl = curl_init();
			curl_setopt_array($curl, array(
			    CURLOPT_RETURNTRANSFER => true,
			    CURLOPT_URL => $this->constructUrl($method, $params),
			    CURLOPT_HTTPHEADER => array('Content-Type: application/json','Content-Length: ' . strlen($postBody)),
			    CURLOPT_USERAGENT => 'cURL',
			    CURLOPT_POST => true,
			    CURLOPT_POSTFIELDS => $postBody
			));
			$response = curl_exec($curl);
			curl_close($curl);
			return $response;
		}

		private function put($method, $params, $postBody) {
			$curl = curl_init();
			curl_setopt_array($curl, array(
			    CURLOPT_RETURNTRANSFER => true,
			    CURLOPT_CUSTOMREQUEST => 'PUT',
			    CURLOPT_HTTPHEADER => array('Content-Type: application/json','Content-Length: ' . strlen($postBody)),
			    CURLOPT_URL => $this->constructUrl($method, $params),
			    CURLOPT_USERAGENT => 'cURL',
			    CURLOPT_POSTFIELDS => $postBody
			));
			$response = curl_exec($curl);
			curl_close($curl);
			return $response;
		}

		private function patch($method, $params, $postBody) {
			$curl = curl_init();
			curl_setopt_array($curl, array(
			    CURLOPT_RETURNTRANSFER => true,
			    CURLOPT_CUSTOMREQUEST => 'PATCH',
			    CURLOPT_HTTPHEADER => array('Content-Type: application/json','Content-Length: ' . strlen($postBody)),
			    CURLOPT_URL => $this->constructUrl($method, $params),
			    CURLOPT_USERAGENT => 'cURL',
			    CURLOPT_POSTFIELDS => $postBody
			));
			$response = curl_exec($curl);
			curl_close($curl);
			return $response;
		}

		private function delete($method, $params) {
			$curl = curl_init();
			curl_setopt_array($curl, array(
			    CURLOPT_RETURNTRANSFER => 1,
			    CURLOPT_CUSTOMREQUEST => 'DELETE',
			    CURLOPT_URL => $this->constructUrl($method, $params),
			    CURLOPT_USERAGENT => 'cURL'
			));
			$response = curl_exec($curl);
			curl_close($curl);
			return $response;
		}

		public function getDocument($collectionName, $documentId) {
			if ($response = $this->get("documents/$collectionName/$documentId")) {
				return new FireStoreDocument($response);
			}
		}

		/**
			This does not work
		*/
		public function setDocument($collectionName, $documentId, $document) {
			return $this->put(
				"documents/$collectionName/$documentId", 
				[ ],
				$document->toJson()
			);
		}

		public function updateDocument($collectionName, $documentId, $document, $documentExists=null) {
			$params = [];
			if ($documentExists !== null) {
				$params['currentDocument.exists'] = !!$documentExists;
			}
			return $this->patch(
				"documents/$collectionName/$documentId", 
				$params,
				$document->toJson()
			);
		}

		public function deleteDocument($collectionName, $documentId) {
			return $this->delete(
				"documents/$collectionName/$documentId", []
			);
		}

		public function addDocument($collectionName, $document) {
			return $this->post(
				"documents/$collectionName", 
				[],
				$document->toJson()
			);
		}

	}

}

Hi, I am using this library, but I did not understand how to use code to update record which already present int Firebase collection. If anyone can help?