PHP 速成课程：简单图片库-php教程-PHP中文网

PHP crash course: Simple Image Gallery

功能齐全的图像库，具有使用 PHP、HTML、jQuery、AJAX、JSON、Bootstrap、CSS 和 MySQL 上传功能。该项目包含详细的分步解决方案以及代码解释和文档，使其成为一个全面的学习教程。

主题：php、mysql、博客、ajax、bootstrap、jquery、css、图片库、文件上传

分步解决方案

1. 目录结构

simple-image-gallery/
│
├── index.html
├── db/
│   └── database.sql
├── src/
│   ├── fetch-image.php
│   └── upload.php
├── include/
│   ├── config.sample.php
│   └── db.php
├── assets/
│   ├── css/
│   │   └── style.css
│   ├── js/
│   │   └── script.js
│   └── uploads/
│   │   └── (uploaded images will be stored here)
├── README.md
└── .gitignore

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2. 数据库架构

db/database.sql:

CREATE TABLE IF NOT EXISTS `images` (
    `id` int(11) NOT NULL AUTO_INCREMENT,
    `file_name` varchar(255) NOT NULL,
    `uploaded_on` datetime NOT NULL,
    PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

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3. 配置文件

配置设置（include/config.sample.php）

<?php
define('DB_HOST', 'localhost'); // Database host
define('DB_NAME', 'image_gallery'); // Database name
define('DB_USER', 'root'); // Change if necessary
define('DB_PASS', ''); // Change if necessary
define('UPLOAD_DIRECTORY', '/assets/uploads/'); // Change if necessary
?>

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4. 配置数据库连接

建立数据库连接（include/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,
];

// Create a new PDO instance
try {
    $pdo = new PDO($dsn, DB_USER, DB_PASS, $options);
    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION); // Set error mode to exception
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage(); // Display error message if connection fails
}
?>

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5. HTML 和 PHP 结构

HTML 结构 (index.html)

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Image Gallery Upload</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
    <link rel="stylesheet" href="assets/css/styles.css">
</head>
<body>
<div class="container">
    <h1 class="text-center mt-5">Image Gallery</h1>
    <div class="row">
        <div class="col-md-6 offset-md-3">
            <form id="uploadImage" enctype="multipart/form-data">
                <div class="form-group">
                    <label for="image">Choose Image</label>
                    <input type="file" name="image" id="image" class="form-control" required>
                </div>
                <button type="submit" class="btn btn-primary">Upload</button>
            </form>
            <div id="upload-status"></div>
        </div>
    </div>
    <hr>
    <div class="row" id="gallery">
        <!-- Images will be loaded here -->
    </div>
</div>
<script src="https://code.jquery.com/jquery-3.5.1.min.js"></script>
<script src="assets/js/script.js"></script> <!-- Custom JS -->
</body>
</html>

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6. JavaScript 和 AJAX

AJAX 处理 (assets/js/script.js)

$(document).ready(function(){
    // load gallery on page load
    loadGallery();

    // Form submission for image upload
    $('#uploadImage').on('submit', function(e){
        e.preventDefault(); // Prevent default form submission
        var file_data = $('#image').prop('files')[0];
        var form_data = new FormData();
        form_data.append('file', file_data);
        //hide upload section
        $('#uploadImage').hide();
        $.ajax({
            url: 'src/upload.php', // PHP script to process upload
            type: 'POST',
            dataType: 'text', // what to expect back from the server
            cache: false,
            data: new FormData(this), // Form data for upload
            processData: false,
            contentType: false,
            success: function(response){
                let jsonData = JSON.parse(response);
                if(jsonData.status == 1){
                    $('#image').val(''); // Clear the file input
                    loadGallery(); // Fetch and display updated images
                    $('#upload-status').html('<div class="alert alert-success">'+jsonData.message+'</div>');
                } else {
                    $('#upload-status').html('<div class="alert alert-success">'+jsonData.message+'</div>'); // Display error message
                }
                // hide message box
                autoHide('#upload-status');
                //show upload section
                autoShow('#uploadImage');
            }
        });
    });
});

// Function to load the gallery from server
function loadGallery() {
    $.ajax({
        url: 'src/fetch-images.php', // PHP script to fetch images
        type: 'GET',
        success: function(response){
            let jsonData = JSON.parse(response);
            $('#gallery').html(''); // Clear previous images
            if(jsonData.status == 1){
                $.each(jsonData.data, function(index, image){
                    $('#gallery').append('<div class="col-md-3"><img src="assets/uploads/'+image.file_name+'" class="img-responsive img-thumbnail"></div>'); // Display each image
                });
            } else {
                $('#gallery').html('<p>No images found...</p>'); // No images found message
            }
        }
    });
}

//Auto Hide Div
function autoHide(idORClass) {
    setTimeout(function () {
        $(idORClass).fadeOut('fast');
    }, 1000);
}

//Auto Show Element
function autoShow(idORClass) {
    setTimeout(function () {
        $(idORClass).fadeIn('fast');
    }, 1000);
}

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7. 后端 PHP 脚本

获取图像 (src/fetch-images.php)

<?php
include '../include/db.php'; // Include database configuration

$response = array('status' => 0, 'message' => 'No images found.');

// Fetching images from the database
$query = $pdo->prepare("SELECT * FROM images ORDER BY uploaded_on DESC");
$query->execute();
$images = $query->fetchAll(PDO::FETCH_ASSOC);

if(count($images) > 0){
    $response['status'] = 1;
    $response['data'] = $images; // Returning images data
}

// Return response
echo json_encode($response);
?>
?>

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图片上传 (src/upload.php)

<?php
include '../include/db.php'; // Include database configuration
$response = array('status' => 0, 'message' => 'Form submission failed, please try again.');

if(isset($_FILES['image']['name'])){
    // Directory where files will be uploaded
    $targetDir = UPLOAD_DIRECTORY;
    $fileName = date('Ymd').'-'.str_replace(' ', '-', basename($_FILES['image']['name']));
    $targetFilePath = $targetDir . $fileName;
    $fileType = pathinfo($targetFilePath, PATHINFO_EXTENSION);

    // Allowed file types
    $allowTypes = array('jpg','png','jpeg','gif');
    if(in_array($fileType, $allowTypes)){
        // Upload file to server
        if(move_uploaded_file($_FILES['image']['tmp_name'], $targetFilePath)){
            // Insert file name into database
            $insert = $pdo->prepare("INSERT INTO images (file_name, uploaded_on) VALUES (:file_name, NOW())");
            $insert->bindParam(':file_name', $fileName);
            $insert->execute();
            if($insert){
                $response['status'] = 1;
                $response['message'] = 'Image uploaded successfully!';
            }else{
                $response['message'] = 'Image upload failed, please try again.';
            }
        }else{
            $response['message'] = 'Sorry, there was an error uploading your file.';
        }
    }else{
        $response['message'] = 'Sorry, only JPG, JPEG, PNG, & GIF files are allowed to upload.';
    }
}

// Return response
echo json_encode($response);
?>

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6.CSS样式

CSS 样式 (assets/css/style.css)

body {
    background-color: #f8f9fa;
}

#gallery .col-md-4 {
    margin-bottom: 20px;
}

#gallery img {
    display: block;
    width: 200px;
    height: auto;
    margin: 10px;
}

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