Common image processing classes in php, _PHP tutorial
PHP common image processing classes,
<?php /*已知问题:1.在图片缩放功能中,使用imagecreatetruecolor函数创建画布,并使用透明处理算法,但PNG格式的图片无法透明。用imagecreate函数创建画布可以解决这个问题,但是缩放出来的图片色数太少了 * * *type值: * (1):代表使用图片缩放功能,此时,$value1代表缩放后图片的宽度,$value2代表缩放后图片的高度 * (2):代表使用图片裁剪功能,此时,$value1代表裁剪开始点的坐标,例:从原点开始即是“0,0”前面是x轴后面是y轴,中间用,分隔,$value2代表裁剪的宽度和高度,同样也是“20,20”的形式使用 * (3):代表使用加图片水印功能,此时,$value1代表水印图片的文件名,$value2代表水印在图片中的位置,有10值个可以选,1代表左上,2代表左中,3代表左右,4代表中左,5代表中中,6代表中右,7代表下做,8代表下中,9代表下右,0代表随机位置 * */ class image{ private $types; //使用的功能编号,1为图片缩放功能 2为图片裁剪功能 3,为图片加图片水印功能 private $imgtype;//图片的格式 private $image; //图片资源 private $width;//图片宽度 private $height;//图片高度 private $value1;//根据所传type值的不同,$value1分别代表不同的值 private $value2;//根据所传type值的不同,$value2分别代表不同的值 private $endaddress;//输出后的地址+文件名 function __construct($imageaddress, $types, $value1="", $value2="", $endaddress){ $this->types=$types; $this->image=$this->imagesources($imageaddress); $this->width=$this->imagesizex(); $this->height=$this->imagesizey(); $this->value1=$value1; $this->value2=$value2; $this->endaddress=$endaddress; } function outimage(){ //根据传入type值的不同,输出不同的功能 switch($this->types){ case 1: $this->scaling(); break; case 2: $this->clipping(); break; case 3: $this->imagewater(); break; default: return false; } } private function imagewater(){ //http://www.hzhuti.com 加图片水印功能 //用函数获取水印文件的长和宽 $imagearrs=$this->getimagearr($this->value1); //调用函数计算出水印加载的位置 $positionarr=$this->position($this->value2, $imagearrs[0], $imagearrs[1]); //加水印 imagecopy($this->image, $this->imagesources($this->value1), $positionarr[0], $positionarr[1], 0, 0, $imagearrs[0], $imagearrs[1]); //调用输出方法保存 $this->output($this->image); } private function clipping(){ //图片裁剪功能 //将传进来的值分别赋给变量 list($src_x, $src_y)=explode(",", $this->value1); list($dst_w, $dst_h)=explode(",", $this->value2); if($this->width < $src_x+$dst_w || $this->height < $src_y+$dst_h){ //这个判断就是限制不能截取到图片外面去 return false; } //创建新的画布资源 $newimg=imagecreatetruecolor($dst_w, $dst_h); //进行裁剪 imagecopyresampled($newimg, $this->image, 0, 0, $src_x, $src_y, $dst_w, $dst_h, $dst_w, $dst_h); //调用输出方法保存 $this->output($newimg); } private function scaling(){ //图片缩放功能 //获取等比缩放的宽和高 $this-> proimagesize(); //根据参数进行缩放,并调用输出函数保存处理后的文件 $this->output($this->imagescaling()); } private function imagesources($imgad){ //获取图片类型并打开图像资源 $imagearray=$this->getimagearr($imgad); switch($imagearray[2]){ case 1://gif $this->imgtype=1; $img=imagecreatefromgif($imgad); break; case 2://jpeg $this->imgtype=2; $img=imagecreatefromjpeg($imgad); break; case 3://png $this->imgtype=3; $img=imagecreatefrompng($imgad); break; default: return false; } return $img; } private function imagesizex(){ //获得图片宽度 return imagesx($this->image); } private function imagesizey(){ //获取图片高度 return imagesy($this->image); } private function proimagesize(){ //计算等比缩放的图片的宽和高 if($this->value1 && ($this->width < $this->height)) { //等比缩放算法 $this->value1=round(($this->value2/ $this->height)*$this->width); }else{ $this->value2=round(($this->value1/ $this->width) * $this->height); } } private function imagescaling(){//图像缩放功能,返回处理后的图像资源 $newimg=imagecreatetruecolor($this->value1, $this->value2); $tran=imagecolortransparent($this->image);//处理透明算法 if($tran >= 0 && $tran < imagecolorstotal($this->image)){ $tranarr=imagecolorsforindex($this->image, $tran); $newcolor=imagecolorallocate($newimg, $tranarr['red'], $tranarr['green'], $tranarr['blue']); imagefill($newimg, 0, 0, $newcolor); imagecolortransparent($newimg, $newcolor); } imagecopyresampled($newimg, $this->image, 0, 0, 0, 0, $this->value1, $this->value2, $this->width, $this->height); return $newimg; } private function output($image){//输出图像 switch($this->imgtype){ case 1: imagegif($image, $this->endaddress); break; case 2: imagejpeg($image, $this->endaddress); break; case 3: imagepng($image, $this->endaddress); break; default: return false; } } private function getimagearr($imagesou){//返回图像属性数组方法 return getimagesize($imagesou); } private function position($num, $width, $height){//根据传入的数字返回一个位置的坐标,$width和$height分别代表插入图像的宽和高 switch($num){ case 1: $positionarr[0]=0; $positionarr[1]=0; break; case 2: $positionarr[0]=($this->width-$width)/2; $positionarr[1]=0; break; case 3: $positionarr[0]=$this->width-$width; $positionarr[1]=0; break; case 4: $positionarr[0]=0; $positionarr[1]=($this->height-$height)/2; break; case 5: $positionarr[0]=($this->width-$width)/2; $positionarr[1]=($this->height-$height)/2; break; case 6: $positionarr[0]=$this->width-$width; $positionarr[1]=($this->height-$height)/2; break; case 7: $positionarr[0]=0; $positionarr[1]=$this->height-$height; break; case 8: $positionarr[0]=($this->width-$width)/2; $positionarr[1]=$this->height-$height; break; case 9: $positionarr[0]=$this->width-$width; $positionarr[1]=$this->height-$height; break; case 0: $positionarr[0]=rand(0, $this->width-$width); $positionarr[1]=rand(0, $this->height-$height); break; } return $positionarr; } function __destruct(){ imagedestroy($this->image); } } ?>

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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