API wrapper

request.php

<?php 

namespace App\DistanceApi\Api;

/*
|--------------------------------------------------------------------------
| Request Class
|--------------------------------------------------------------------------
|
| This class is used when querying your API.
|
| * Class is called via the Facade 'Api'
| * E.g. Api::getDistance('api');
|
*/

class Request {

	/**
	* @var string The domain location of the API
	*/
	private static $curl;
	
	private static $requestParameters = array();  

    private static $domain = 'https://maps.googleapis.com';
    
    /**
	* @var string Path to Google Distance Matrix API
    */
    
	private static $path = 'maps/api/distancematrix/json';
	
	private static $measuringUnit = 'metric';

	/**
	* @var array Any additional parameters to be sent with each request
	*/

	private static function getParameters() {
		return [
			'units'=> self::$measuringUnit,
        	'key' => env('YOUR_API_KEY'),
		];
	}

	private static $coordinateParameters = [
		'origins','destinations'
	];

	/**
	* @var bool Set whether the cURL request will be over HTTP or HTTPS
        * false = HTTP
        * true = HTTPS
	*/

	private static $secure = true;

	private static function getDistance($params =[]) {

		self::$curl = curl_init();
		curl_setopt_array( self::$curl, [
				CURLOPT_SSL_VERIFYPEER => self::$secure,
                CURLOPT_RETURNTRANSFER => 1,
                CURLOPT_URL => self::urlBuilder($params),
			]
		);
        return curl_exec( self::$curl);
    }
    
	/**
	* Function to build URL 
	*/

	private static function urlBuilder($params = []){

		return self::$domain . '/' . self::$path . '?' . http_build_query($params);

    }
    
    /**
	*  Distance calculation
	*/

    public static function calculateDistance($data){

        $data = array_map(function($v){return implode(',',(array)$v);},$data);
		$data = array_combine(self::$coordinateParameters,$data);
		self::$requestParameters = self::getParameters();
        self::$requestParameters = array_merge($data,self::$requestParameters);

		$response = json_decode(self::getDistance(self::$requestParameters), true);

            if (isset($response['rows'][0]['elements'][0]['distance']['value'])) {
				$response =  $response['rows'][0]['elements'][0]['distance']['value'];
				
            }else{
               $response = $response['error_message'];
			}
		return $response;
    }
}