国产av日韩一区二区三区精品,成人性爱视频在线观看,国产,欧美,日韩,一区,www.成色av久久成人,2222eeee成人天堂

Home Backend Development PHP Tutorial How to realize image rotation using PHP and GD library

How to realize image rotation using PHP and GD library

Jul 12, 2023 am 11:52 AM
php gd library Picture rotation

How to implement image rotation using PHP and GD libraries

Image rotation is a common image processing requirement. By rotating images, you can achieve some special effects or meet user needs. In PHP, you can use the GD library to implement the image rotation function. This article will introduce how to use PHP and the GD library to implement image rotation, with code examples.

First, make sure your PHP environment has the GD library extension installed. Enter php -m on the command line to check if there is a gd module. If not, you need to install it first.

The following is a simple code example to implement the image rotation function:

<?php
// 讀取原始圖片
$imagePath = 'path_to_your_image.jpg';
$sourceImage = imagecreatefromjpeg($imagePath);

// 創(chuàng)建一個新的畫布,用于存放旋轉(zhuǎn)后的圖片
$width = imagesx($sourceImage);
$height = imagesy($sourceImage);
$rotateImage = imagecreatetruecolor($height, $width);

// 旋轉(zhuǎn)圖片
$degrees = 90; // 設(shè)置旋轉(zhuǎn)的角度,可以根據(jù)需要進(jìn)行更改
$rotateImage = imagerotate($sourceImage, $degrees, 0);

// 保存旋轉(zhuǎn)后的圖片
$outputImagePath = 'path_to_save_rotated_image.jpg';
imagejpeg($rotateImage, $outputImagePath);

// 釋放資源
imagedestroy($sourceImage);
imagedestroy($rotateImage);

echo '圖片旋轉(zhuǎn)完成!';
?>

In the above code, the original image is first read through the imagecreatefromjpeg() function. If your image format is not JPEG, you need to use the corresponding function to read it.

Then, create a new canvas with the same size as the original image to store the rotated image. To ensure that the canvas can accommodate the rotated image, the width and height of the canvas need to be adjusted.

The next step is to implement image rotation. The imagerotate() function can be used to rotate the image according to the specified angle. Among them, the first parameter is the original image resource, the second parameter is the angle of rotation, and the third parameter is to set the background color (optional), here we set it to 0.

Finally, use the imagejpeg() function to save the rotated image to the specified path.

Finally, don’t forget to release resources and use the imagedestroy() function to destroy the original image and the rotated image.

This is just a simple example, you can modify and extend the code according to actual needs. For example, the rotation angle can be dynamically set through user input, or functions such as batch rotation of pictures can be implemented.

Summary:

This article introduces how to use PHP and GD library to achieve image rotation. By calling the functions provided by the GD library, we can easily implement the function of rotating images. I hope this article can help you when using PHP for image processing.

PHP and GD libraries are very powerful tools. Mastering them, you can implement various complex image processing operations. Not only limited to rotation, but also scaling, cropping, watermarking, and more. In actual projects, these image processing functions can bring a better user experience and enhance the attractiveness of the website.

The above is the detailed content of How to realize image rotation using PHP and GD library. For more information, please follow other related articles on the PHP Chinese website!

Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undress AI Tool

Undress AI Tool

Undress images for free

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Clothoff.io

Clothoff.io

AI clothes remover

Video Face Swap

Video Face Swap

Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

Hot Topics

PHP Tutorial
1488
72
How to use PHP to build social sharing functions PHP sharing interface integration practice How to use PHP to build social sharing functions PHP sharing interface integration practice Jul 25, 2025 pm 08:51 PM

The core method of building social sharing functions in PHP is to dynamically generate sharing links that meet the requirements of each platform. 1. First get the current page or specified URL and article information; 2. Use urlencode to encode the parameters; 3. Splice and generate sharing links according to the protocols of each platform; 4. Display links on the front end for users to click and share; 5. Dynamically generate OG tags on the page to optimize sharing content display; 6. Be sure to escape user input to prevent XSS attacks. This method does not require complex authentication, has low maintenance costs, and is suitable for most content sharing needs.

PHP calls AI intelligent voice assistant PHP voice interaction system construction PHP calls AI intelligent voice assistant PHP voice interaction system construction Jul 25, 2025 pm 08:45 PM

User voice input is captured and sent to the PHP backend through the MediaRecorder API of the front-end JavaScript; 2. PHP saves the audio as a temporary file and calls STTAPI (such as Google or Baidu voice recognition) to convert it into text; 3. PHP sends the text to an AI service (such as OpenAIGPT) to obtain intelligent reply; 4. PHP then calls TTSAPI (such as Baidu or Google voice synthesis) to convert the reply to a voice file; 5. PHP streams the voice file back to the front-end to play, completing interaction. The entire process is dominated by PHP to ensure seamless connection between all links.

How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization How to use PHP combined with AI to achieve text error correction PHP syntax detection and optimization Jul 25, 2025 pm 08:57 PM

To realize text error correction and syntax optimization with AI, you need to follow the following steps: 1. Select a suitable AI model or API, such as Baidu, Tencent API or open source NLP library; 2. Call the API through PHP's curl or Guzzle and process the return results; 3. Display error correction information in the application and allow users to choose whether to adopt it; 4. Use php-l and PHP_CodeSniffer for syntax detection and code optimization; 5. Continuously collect feedback and update the model or rules to improve the effect. When choosing AIAPI, focus on evaluating accuracy, response speed, price and support for PHP. Code optimization should follow PSR specifications, use cache reasonably, avoid circular queries, review code regularly, and use X

PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy PHP creates a blog comment system to monetize PHP comment review and anti-brush strategy Jul 25, 2025 pm 08:27 PM

1. Maximizing the commercial value of the comment system requires combining native advertising precise delivery, user paid value-added services (such as uploading pictures, top-up comments), influence incentive mechanism based on comment quality, and compliance anonymous data insight monetization; 2. The audit strategy should adopt a combination of pre-audit dynamic keyword filtering and user reporting mechanisms, supplemented by comment quality rating to achieve content hierarchical exposure; 3. Anti-brushing requires the construction of multi-layer defense: reCAPTCHAv3 sensorless verification, Honeypot honeypot field recognition robot, IP and timestamp frequency limit prevents watering, and content pattern recognition marks suspicious comments, and continuously iterate to deal with attacks.

How to use PHP to combine AI to generate image. PHP automatically generates art works How to use PHP to combine AI to generate image. PHP automatically generates art works Jul 25, 2025 pm 07:21 PM

PHP does not directly perform AI image processing, but integrates through APIs, because it is good at web development rather than computing-intensive tasks. API integration can achieve professional division of labor, reduce costs, and improve efficiency; 2. Integrating key technologies include using Guzzle or cURL to send HTTP requests, JSON data encoding and decoding, API key security authentication, asynchronous queue processing time-consuming tasks, robust error handling and retry mechanism, image storage and display; 3. Common challenges include API cost out of control, uncontrollable generation results, poor user experience, security risks and difficult data management. The response strategies are setting user quotas and caches, providing propt guidance and multi-picture selection, asynchronous notifications and progress prompts, key environment variable storage and content audit, and cloud storage.

PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism PHP realizes commodity inventory management and monetization PHP inventory synchronization and alarm mechanism Jul 25, 2025 pm 08:30 PM

PHP ensures inventory deduction atomicity through database transactions and FORUPDATE row locks to prevent high concurrent overselling; 2. Multi-platform inventory consistency depends on centralized management and event-driven synchronization, combining API/Webhook notifications and message queues to ensure reliable data transmission; 3. The alarm mechanism should set low inventory, zero/negative inventory, unsalable sales, replenishment cycles and abnormal fluctuations strategies in different scenarios, and select DingTalk, SMS or Email Responsible Persons according to the urgency, and the alarm information must be complete and clear to achieve business adaptation and rapid response.

Beyond the LAMP Stack: PHP's Role in Modern Enterprise Architecture Beyond the LAMP Stack: PHP's Role in Modern Enterprise Architecture Jul 27, 2025 am 04:31 AM

PHPisstillrelevantinmodernenterpriseenvironments.1.ModernPHP(7.xand8.x)offersperformancegains,stricttyping,JITcompilation,andmodernsyntax,makingitsuitableforlarge-scaleapplications.2.PHPintegrateseffectivelyinhybridarchitectures,servingasanAPIgateway

PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution PHP integrated AI speech recognition and translator PHP meeting record automatic generation solution Jul 25, 2025 pm 07:06 PM

Select the appropriate AI voice recognition service and integrate PHPSDK; 2. Use PHP to call ffmpeg to convert recordings into API-required formats (such as wav); 3. Upload files to cloud storage and call API asynchronous recognition; 4. Analyze JSON results and organize text using NLP technology; 5. Generate Word or Markdown documents to complete the automation of meeting records. The entire process needs to ensure data encryption, access control and compliance to ensure privacy and security.

See all articles