PHP crash course: Simple Weather App

A weather application that fetches and displays weather information from an API using PHP, jQuery, AJAX, Bootstrap, CSS, and MySQL.

Topics:

- PHP
- Weather API
- jQuery
- AJAX
- Bootstrap
- CSS
- MySQL

Step-by-Step Solution with Code Explanation

1. Directory Structure

weather-app/
│
├── config.sample.php
├── database/
│   └── weather_app.sql
├── src/
│   ├── api.php
│   ├── fetch_weather.php
│   └── index.php
├── css/
│   └── styles.css
├── js/
│   └── script.js
├── vendor/
│   └── (composer dependencies)
├── composer.json
├── README.md
└── .gitignore

2. Database Schema

database/database.sql:

CREATE DATABASE IF NOT EXISTS weather_app;
USE weather_app;

CREATE TABLE IF NOT EXISTS weather_logs (
    id INT AUTO_INCREMENT PRIMARY KEY,
    city VARCHAR(100) NOT NULL,
    temperature FLOAT NOT NULL,
    description VARCHAR(255) NOT NULL,
    created_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

3. Configuration File

config.sample.php:

<?php
define('DB_HOST', 'localhost');
define('DB_NAME', 'weather_app');
define('DB_USER', 'root');
define('DB_PASS', '');

define('WEATHER_API_KEY', 'your_api_key_here');
define('WEATHER_API_URL', 'http://api.openweathermap.org/data/2.5/weather');
?>

4. Configure the Database Connection

db.php:

<?php
   include 'config.php';
   // Database configuration
   $dsn = 'mysql:host='.DB_HOST.';dbname='.DB_NAME;
   $options = [
       PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
       PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
   ];

   try {
       $pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
       $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
   } catch (PDOException $e) {
       die('Database connection failed: ' . $e->getMessage());
   }
?>```



#### 5. **API Handling**

**src/api.php:**


```php
<?php
require_once '../db.php';

function getWeatherData($city) {
    $url = WEATHER_API_URL . "?q=" . urlencode($city) . "&appid=" . WEATHER_API_KEY . "&units=metric";
    $response = file_get_contents($url);
    return json_decode($response, true);
}

if (isset($_GET['city'])) {
    $city = $_GET['city'];
    $weatherData = getWeatherData($city);

    // Save to database
    $stmt = $pdo->prepare('INSERT INTO weather_logs (city, temperature, description) VALUES (?, ?, ?)');
    $stmt->execute([
        $weatherData['name'],
        $weatherData['main']['temp'],
        $weatherData['weather'][0]['description']
    ]);

    echo json_encode($weatherData);
}
?>

6. Fetching Weather Data

src/fetch_weather.php:

<?php
require_once '../db.php';

$stmt = $pdo->query('SELECT * FROM weather_logs ORDER BY created_at DESC');
$weatherLogs = $stmt->fetchAll(PDO::FETCH_ASSOC);

echo json_encode($weatherLogs);
?>

7. HTML and Frontend Code

index.html:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Weather App</title>
    <link rel="stylesheet" href="css/styles.css">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css">
</head>
<body>
    <div class="container">
        <h1 class="mt-5">Weather App</h1>
        <div class="form-group">
            <label for="city">Enter city name:</label>
            <input type="text" id="city" class="form-control">
        </div>
        <button id="getWeather" class="btn btn-primary">Get Weather</button>
        <div id="weatherResult" class="mt-4"></div>
        <h2 class="mt-5">Weather Logs</h2>
        <div id="weatherLogs" class="mt-4"></div>
    </div>
    <script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
    <script src="js/script.js"></script>
</body>
</html>

8. CSS Styles

css/styles.css:

body {
    padding-top: 20px;
}

9. JavaScript and AJAX

js/script.js:

$(document).ready(function () {
    $('#getWeather').click(function () {
        var city = $('#city').val();
        $.ajax({
            url: 'api.php',
            method: 'GET',
            data: { city: city },
            success: function (data) {
                var weather = JSON.parse(data);
                $('#weatherResult').html(
                    `<h3>Weather in ${weather.name}</h3>
                     <p>Temperature: ${weather.main.temp}°C</p>
                     <p>Description: ${weather.weather[0].description}</p>`
                );
                fetchWeatherLogs();
            }
        });
    });

    function fetchWeatherLogs() {
        $.ajax({
            url: 'fetch_weather.php',
            method: 'GET',
            success: function (data) {
                var logs = JSON.parse(data);
                var logsHtml = '<ul class="list-group">';
                logs.forEach(function (log) {
                    logsHtml += `<li class="list-group-item">
                                    <strong>${log.city}</strong>: 
                                    ${log.temperature}°C, 
                                    ${log.description} 
                                    <em>(${log.created_at})</em>
                                </li>`;
                });
                logsHtml += '</ul>';
                $('#weatherLogs').html(logsHtml);
            }
        });
    }

    fetchWeatherLogs();
});

This solution covers the necessary steps to create a weather application using, jQuery, AJAX, Bootstrap, CSS, and MySQL. The provided code explanations and examples should help you understand and implement each part of the application.

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