PHP按一定比例压缩图片(保持清晰度)
图片压缩是我们日常开发中经常使用的操作,在如今需求很多的情况往往,上传的一张图片会被压缩成不同比例的图片,每次去操作也是一件非常繁琐的事情,于是进行了封装了一个压缩图片的操作类,希望大家遇到后,不用再为写很多压缩图片代码烦恼了。
压缩图片的工具类:
<?php/** 图片压缩操作类 v1.0*/class Image{private $src;private $imageinfo;private $image;public $percent = 0.1;public function __construct($src){$this->src = $src;}/**打开图片*/public function openImage(){list($width, $height, $type, $attr) = getimagesize($this->src);$this->imageinfo = array('width'=>$width,'height'=>$height,'type'=>image_type_to_extension($type,false),'attr'=>$attr);$fun = "imagecreatefrom".$this->imageinfo['type'];$this->image = $fun($this->src);}/**操作图片*/public function thumpImage(){ $new_width = $this->imageinfo['width'] * $this->percent;$new_height = $this->imageinfo['height'] * $this->percent;$image_thump = imagecreatetruecolor($new_width,$new_height);//将原图复制带图片载体上面,并且按照一定比例压缩,极大的保持了清晰度imagecopyresampled($image_thump,$this->image,0,0,0,0,$new_width,$new_height,$this->imageinfo['width'],$this->imageinfo['height']);imagedestroy($this->image);$this->image = $image_thump;}/**输出图片*/public function showImage(){ header('Content-Type: image/'.$this->imageinfo['type']);$funcs = "image".$this->imageinfo['type'];$funcs($this->image);}/**保存图片到硬盘*/public function saveImage($name){ $funcs = "image".$this->imageinfo['type'];$funcs($this->image,$name.'.'.$this->imageinfo['type']);}/**销毁图片*/public function __destruct(){imagedestroy($this->image);}} ?>测试:
<?phprequire 'image.class.php';$src = "001.jpg";$image = new Image($src);$image->percent = 0.2;$image->openImage();$image->thumpImage();$image->showImage();$image->saveImage(md5("aa123")); ?>结果:
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