


The example of this article describes the image (thumbnail) processing class encapsulated by PHP. Share it with everyone for your reference, the details are as follows:
<?php //图片处理工具类 class Image{ //属性 private $thumb_width; //缩略图的宽 private $thumb_height; //错误属性 public $thumb_error; //构造方法 public function __construct($width = 0,$height = 0){ $this->thumb_width = ($width == 0) ? $GLOBALS['config']['admin_goods_thumb']['width'] : $width; $this->thumb_height = ($height == 0) ? $GLOBALS['config']['admin_goods_thumb']['height'] : $height; } /* * 制作缩略图 * @param1 string $src,原图路径,/uploads/20150122101010abcdef.gif * @param2 string $path,缩略图保存路径/uploads/thumb_20150122101010abcdef.gif * @return 缩略图的名字 */ public function makeThumb($src,$path){ //判断原图是否存在 if(!file_exists($src)){ $this->thumb_error = '原图不存在!'; return false; } //打开原图资源 //获取能够使用的后缀 $ext = $this->getFunctionName($src); //gif //拼凑函数名 $open = 'imagecreatefrom' . $ext; //imagecreatefromgif $save = 'image' . $ext; //imagegif //如果不清楚;echo $open,$save;exit; //可变函数打开原图资源 $src_img = $open($src); //利用可变函数打开图片资源 //imagecreatefromgif($src) //缩略图资源 $dst_img = imagecreatetruecolor($this->thumb_width,$this->thumb_height); //背景色填充白色 $dst_bg_color = imagecolorallocate($dst_img,255,255,255); imagefill($dst_img,0,0,$dst_bg_color); //宽高比确定宽高 $dst_size = $this->thumb_width / $this->thumb_height; //获取原图数据 $file_info = getimagesize($src); $src_size = $file_info[0]/$file_info[1]; //求出缩略图宽和高 if($src_size > $dst_size){ //原图宽高比大于缩略图 $width = $this->thumb_width; $height = round($width / $src_size); }else{ $height = $this->thumb_height; $width = round($height * $src_size); } //求出缩略图起始位置 $dst_x = round($this->thumb_width - $width)/2; $dst_y = round($this->thumb_height - $height)/2; //制作缩略图 if(imagecopyresampled($dst_img,$src_img,$dst_x,$dst_y,0,0,$width,$height,$file_info[0],$file_info[1])){ //采样成功:保存,将文件保存到对应的路径下 $thumb_name = 'thumb_' . basename($src); $save($dst_img,$path . '/' . $thumb_name); //保存成功 return $thumb_name; }else{ //采样失败 $this->thumb_error = '缩略图采样失败!'; return false; } } /* * 获取文件要调用的函数名 * @param1 string $file,文件名字 * @return 通过文件后缀名得到的函数字符串 */ private function getFunctionName($file){ //得到文件的后缀 $file_info = pathinfo($file); $ext = $file_info['extension']; //后缀:gif,png,jpg,jpeg,pjpeg //imagecreatefromgif,imagecreatefromjpeg,imagecreatefrompng //定义一个数组保存函数名 $func = array( 'gif' => 'gif', 'png' => 'png', 'jpg' => 'jpeg', 'jpeg' => 'jpeg', 'pjpeg' => 'jpeg' ); //返回值 return $func[$ext]; } }
The above is the content of the complete example of the PHP encapsulated image (thumbnail) processing class, more For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

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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