Backend Development
PHP Tutorial
Teach you step by step how to use php to implement the image upload function
Teach you step by step how to use php to implement the image upload function
In order to test the image upload function and save the image path to the database, we must first create a new test table test_img.
CREATE TABLE test_img ( id int(4) UNSIGNED NOT NULL AUTO_INCREMENT, path varchar(100) default NULL, upload_time timestamp default CURRENT_TIMESTAMP, PRIMARY KEY(id) )engine=myisam DEFAULT charset=utf8
sql command: Generate a unique number when inserting into the table. For example, if there is too much test data, the id will continue to increase by itself. If you want to Returning to step 1, you can try the following commands.
alter table test_img auto_increment = 1
Second, create a newimg.html file for selecting uploaded images
<!DOCTYPE html><html lang="utf-8"><head>
<meta charset="UTF-8">
<title>图片上传</title></head><body><form action="img.php" method="post" enctype="multipart/form-data">
选择上传的图片: <input type="file" name="file" accept="image/*">
<br><br>
<input type="submit" value="上传"></form>< ;form> The enctype in the tag controls whether to encode and send the form data. The default is application/x-www-form-urlencoded, which means all characters are encoded before sending.
| Value | Description |
|---|---|
| Encode all characters before sending (default) | |
| Do not encode characters. This value must be used when using a form that contains a file upload control | |
| Spaces are converted to " " plus signs, but special characters are not encoded |
accept in the tag limits the upload format.
img.php Used to accept and process images
Get the image file and add the specific file name to the data table test_img, move_uploaded_file Store the image file in the target folder, iconv perform character encoding to prevent garbled characters after uploading images with Chinese names. <div class="code" style="position:relative; padding:0px; margin:0px;"><pre class='brush:php;toolbar:false;'><?php
header("Content-Type: text/html;charset=utf-8");
$conn = new mysqli(&#39;localhost&#39;, &#39;root&#39;, &#39;&#39;, &#39;test&#39;);
if (!$conn) {
die("Connection failed: " . mysqli_connect_error());
}
$destination = &#39;../upload/image/&#39;;
$file = $_FILES[&#39;file&#39;]; // 获取上传的图片
$filename = $file[&#39;name&#39;];
$insert = "INSERT INTO test_img (path) VALUES (&#39;$filename&#39;)";
$test = move_uploaded_file($file[&#39;tmp_name&#39;], $destination . iconv("UTF-8", "gb2312", $filename));
if ($insert && $test) {
$conn->query($insert);
} else {
echo &#39;上传失败&#39; . &#39;<br>&#39;;
}
$select = &#39;SELECT path FROM test_img&#39;;
$result = $conn->query($select);
while ($row = $result->fetch_assoc()) {
echo "<img src="/static/imghw/default1.png" data-src=" . $destination . $row[&#39;path&#39;] . " class="lazy" alt="Teach you step by step how to use php to implement the image upload function" >";
}</pre><div class="contentsignin">Copy after login</div></div>print_r( $_FILES['file']); // Output the received uploaded image and get the following information <blockquote><p></p></blockquote>
<p><img src="/static/imghw/default1.png" data-src="https://img.php.cn/upload/article/000/000/053/744e6b0d5394a13101135b3e6038965e-0.jpg" class="lazy" alt="">After the image is successfully uploaded, pass the data table The picture information matches the pictures under </p>upload/image<p> and is displayed in a loop. The effect is as follows.<code>
The above is just a rough version of how to upload pictures in PHP. You can try to modify and improve some details yourself. If you want to learn well, you must learn it by yourself. Cloud learning can only scratch the surface. If my sharing can help If you have some inspiration, why not give me a like and encourage me? Of course, you don’t have to give it, I will also drive myself to learn~
Thank you everyone for reading, I hope you can gain something
Recommended tutorial: "
php tutorialThe above is the detailed content of Teach you step by step how to use php to implement the image upload function. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
1664
14
1423
52
1317
25
1268
29
1242
24
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.
PHP in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.
PHP: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.
