PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印_PHP教程
PHP图像操作教程:3D图、缩放、旋转、裁剪、添加水印
图片操作在网站的应用相当广范,特别是现在互联网高度发达,很多内容都是以图片来显示,现在我们来讲讲用php来操作上传的图片,3D图片绘制、图片缩放、图片旋转、图片裁剪、图片添加水印。
1、利用php gd库的函数绘制3D扇形统计图
代码如下 | |
header("content-type","text/html;charset=utf-8"); /*扇形统计图*/ $image = imagecreatetruecolor(100, 100); /*创建画布*/ /*设置画布需要的颜色*/ $white = imagecolorallocate($image,0xff,0xff,0xff); $gray = imagecolorallocate($image, 0xc0, 0xc0, 0xc0); $darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90); $navy = imagecolorallocate($image, 0x00, 0x00, 0x80); $darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50); $red = imagecolorallocate($image, 0xff, 0x00, 0x00); $darkred = imagecolorallocate($image, 0x90, 0x00, 0x00); /*填充背景色*/ imagefill($image, 0, 0, $white); /*3D制作*/ for($i = 60; $i > 50; $i--) { imagefilledarc($image, 50, $i, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE); imagefilledarc($image, 50, $i, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE); imagefilledarc($image, 50, $i, 100, 50, 75, 200, $darkred, IMG_ARC_PIE); } /*画椭圆弧并填充*/ imagefilledarc($image, 50, 50, 100, 50, -160, 40, $darknavy, IMG_ARC_PIE); imagefilledarc($image, 50, 50, 100, 50, 40, 75, $darkgray, IMG_ARC_PIE); imagefilledarc($image, 50, 50, 100, 50, 75, 200, $darkred, IMG_ARC_PIE); /*画字符串*/ imagestring($image, 3, 15, 55, "30%", $white); imagestring($image, 3, 45, 35, "60%", $white); imagestring($image, 3, 60, 60, "10%", $white); /*输出图像*/ header("content-type:image/png"); imagepng($image); /*释放资源*/ imagedestroy($image); ?> |
2、对图片进行缩放
代码如下 | |
原图大小![]() header("content-type","text/html;charset=utf-8"); /* *图片缩放 *@param string $filename 图片的url *@param int $width 设置图片缩放的最大宽度 *@param int $height 设置图片缩放的最大高度 */ function thumb($filename,$width=130,$height=130) { /*获取原图的大小*/ list($width_orig,$height_orig) = getimagesize($filename); /*根据参数$width和$height,换算出等比例的高度和宽度*/ if($width && ($width_orig { $width = ($height / $height_orig) * $width_orig; } else { $height = ($width / $width_orig) * $height_orig; } /*以新的大小创建画布*/ $image_p = imagecreatetruecolor($width, $height); /*获取图像资源*/ $image = imagecreatefrompng($filename); /*使用imagecopyresampled缩放*/ imagecopyresampled($image_p, $image, 0, 0, 0, 0, $width, $height, $width_orig, $height_orig); /*保存缩放后的图片和命名*/ imagepng($image_p,'test.png'); /*释放资源*/ imagedestroy($image_p); imagedestroy($image); } /*调用函数*/ thumb('1.png'); ?> 缩放后的大小![]() |
3、PHP对图像的裁剪
代码如下 | |
裁剪之前![]() header("content-type","text/html;charset=utf-8"); /* *图片裁剪 *@param string $filename 图片的url *@param int $width 图片裁剪宽度 *@param int $height 图片裁剪高度 *@param int $x 裁剪图片左边开始的位置 *@param int $y 裁剪图片顶边开始的位置 */ function cut($filename,$x,$y,$width,$height) { /*获取图像资源,需要裁剪的图片*/ $image = imagecreatefrompng($filename); /*以新的大小创建画布,保存裁剪后的图片*/ $image_p = imagecreatetruecolor($width, $height); /*使用imagecopyresampled缩放*/ imagecopyresampled($image_p, $image, 0, 0, $x, $y, $width, $height, $width, $height); /*保存裁剪后的图片和命名*/ imagepng($image_p,'test1.png'); /*释放资源*/ imagedestroy($image_p); imagedestroy($image); } /*调用函数*/ cut('1.png',20,20,80,80); ?> 裁剪之后![]() |
4、PHP为图像添加水印
代码如下 | |
没有水印![]() header("content-type","text/html;charset=utf-8"); /* *给背景图片添加水印,背景图片格式png,水印格式gif *@param string $filename 图片的url *@param string $water 水印图片 */ function watermark($filename,$water) { /*获取原图的大小*/ list($b_w,$b_h) = getimagesize($filename); /*获取水印图片的大小*/ list($w_w,$w_h) = getimagesize($water); /*在背景图片中放水印图片的随机起始位置*/ $posX =rand(0,($b_w - $w_w)); $posY =rand(0,($b_h - $w_h)); /*获取图像资源,需要裁剪的图片*/ $back = imagecreatefrompng($filename); $water = imagecreatefromgif($water); /*使用Inagecopy函数复制水印图片到指定位置*/ imagecopy($back, $water, $posX, $posY, 0, 0, $w_w, $w_h); /*保存带水印的图片和命名*/ imagepng($back,'test2.png'); /*释放资源*/ imagedestroy($back); imagedestroy($water); } /*调用函数*/ watermark('1.png','test.gif'); ?> 加上水印![]() |

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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