PHP OOP: Exceptions

<?php

class CurlException extends Exception {

    public function __construct($curl) 
    {
        $error = curl_error($curl);
        curl_close($curl);
        $this->message = $error;
    }

}

<?php

class HTTPException extends Exception {

    public function __construct($data)
    {
        $data = json_decode($data, true);
        $this->message = $data['message'];
        $this->code = $data['cod'];
    }

}

<?php 

class OpenWeather {

    const ICON_SIZE = '2x'; // '1x', '2x' or '4x'
    const UNITS = 'metric';
    private $api_key;

    public function __construct(string $var)
    {
        $this->api_key = $var;
    }

    public function getCurrent(array $coordinates): array
    {
        $result = [];
        $data = $this->callAPI($coordinates);
        if ($data !== null) {
            $result = $this->getResult($data["current"], $data["timezone"]);
        }
        return $result;
    }

    public function getLastHours(array $coordinates): array
    {
        $result = [];
        $data = $this->callAPI($coordinates);
        if ($data !== null) {
            foreach ($data["hourly"] as $hour) {
                $result[] = $this->getResult($hour, $data["timezone"]);
            }
        }
        return $result;
    }

    public static function getName(string $location): array
    {
        $parts = explode('_', $location);
        $loc_array['city'] = implode( '-', array_map( 'ucfirst', explode('-', $parts[0]) ) );
        $loc_array['country'] = strtoupper($parts[1]);
        return $loc_array;
    }

    private function callAPI(array $coordinates): ?array
    {
        $time = time()-1;
        $latitude = $coordinates[0];
        $longitude = $coordinates[1];
        $unit = self::UNITS;
        $curl = curl_init("https://api.openweathermap.org/data/2.5/onecall/timemachine?lat={$latitude}&lon={$longitude}&dt=$time&units={$unit}&appid={$this->api_key}");
        curl_setopt_array($curl, [
            CURLOPT_CAINFO          => dirname(__DIR__) . DIRECTORY_SEPARATOR . 'data' . DIRECTORY_SEPARATOR . 'certificates' . DIRECTORY_SEPARATOR . 'openweather.cer',
            CURLOPT_RETURNTRANSFER  => true,
            CURLOPT_TIMEOUT_MS      => 3500
        ]);
        $data = curl_exec($curl);
        if ($data === false) {
            throw new CurlException($curl);
        }
        $code = curl_getinfo($curl, CURLINFO_HTTP_CODE);
        if ($code !== 200) {
            curl_close($curl);
            throw new HTTPException($data);
        }
        curl_close($curl);
        return json_decode($data, true);
    }

    private function getResult($data_when, $timezone): array
    {
        if (self::ICON_SIZE === '2x' || self::ICON_SIZE === '4x') {
            $icon_size = '@' . self::ICON_SIZE;
        } else {
            $icon_size = '';
        }
        return [
            'temp'          => $data_when["temp"] . '°C',
            'description'   => ucfirst($data_when["weather"][0]["description"]),
            'icon'          => 'http://openweathermap.org/img/wn/' . $data_when["weather"][0]["icon"] . $icon_size . '.png',
            'time'          => $this->getTimeFormated($data_when["dt"], $timezone),
        ];
    }
    
    private function getTimeFormated($timestamp, $timezone): array
    {
        $date = new DateTime("@" . $timestamp);
        $date->setTimeZone(new DateTimeZone($timezone));
        return  [
            'all' => $date->format('M d g:i a'),
            'date' => $date->format('M d'),
            'hour' => $date->format('g a'),
        ];
    }

}

<?php 

$locations = [
    'paris_fr'         => [48.85, 2.35],
    'new-york_us'      => [40.71, -74.00],
    'kerikeri_nz'      => [-35.22, 173.94]
];
$title = 'Weather forecast';
require_once 'includes/header.php';
require_once 'class/OpenWeather.php';
require_once 'class/Exceptions/CurlException.php';
require_once 'class/Exceptions/HTTPException.php';

$alert_class = $error = null;
$weather = new OpenWeather('a4f34eb4cec4aa5200aa8b415963e297c');
try {
    foreach ($locations as $location => $coordinates) {
        $locations_current[$location] = $weather->getCurrent($coordinates);
        $locations_lastHours[$location] = $weather->getLastHours($coordinates); 
    }
} catch (CurlException $e) {
    $error = '<b>API error info:</b> ' . $e->getMessage() . '.';
    $alert_class = 'danger';
} catch (HTTPException $e) {
    $error = '<b>' . $e->getCode() . ' Error status:</b> ' . $e->getMessage();
    $alert_class = 'primary';
}
if($error) {
    $error = '<b>Oops, this was not supposed to happen.</b>
    <div class="small mb-2">' . $error . '</div>
    Please try again later or <a href="contact.php">contact us</a>.';
    $error_sub = '<a href="index.php">Go back to homepage</a>';
} ?>

<p class="lead mb-5">The list below has been made through the OpenWeather API. I links the API to this website thanks to the curl extension for PHP and following <a href="/lessons/20201127_php_Use%20an%20API%20with%20cURL/">this lesson</a>.</p>

<?php if($error): ?>
    <div class="alert <?= $alert_class ? 'alert-'.$alert_class : '' ?>"><?= $error ?></div>
    <div><?= $error_sub ?></div>
<?php else: ?> 
    <div class="row">
        <?php foreach ($locations_current as $location => $data): ?>
            <?php $title = OpenWeather::getName($location) ?>
            <div class="col-md-<?= count($locations) === 4 ? '3' : '4' ?> mb-5">
                <div class="card">
                    <div class="card-body text-center">
                        <h4><?= $title['city'] . ' <span class="small text-muted">(' . $title['country'] . ')</span>' ?></h4>
                        <div class="small text-muted"><?= $data['time']['all'] ?></div>
                        <img src="<?= $data['icon']; ?>"/>
                        <div><?= $data['description'] ?></div>
                        <div><b><?= $data['temp'] ?></b></div>
                    </div>
                </div>
                <div class="mt-3">
                    <ul class="list-unstyled">
                        <?php 
                        $lastHours = $locations_lastHours[$location];
                        for ($i = count($lastHours) - 1; $i >= count($lastHours) - 15; $i -= 2): ?>
                            <?php if (!empty($lastHours[$i])): ?>
                                <li class="small text-muted"><?= $lastHours[$i]['time']['hour'] . ' : <b>' . $lastHours[$i]['temp'] . '</b>  - ' . $lastHours[$i]['description'] ?></li>
                            <?php endif; ?>
                            <?php
                        endfor; ?>
                    </ul>
                </div>
            </div>
        <?php endforeach; ?>
    </div>
<?php endif; ?>

<?php require 'includes/footer.php'; ?>