php实现压缩裁剪png图片功能

php实现压缩裁剪png图片功能,代码很简单,直接贴代码了

<?php
namespace Home\Org;
/**
* 分享请保持网址。尊重别人劳动成果。谢谢。
* 图片压缩类:通过缩放来压缩。如果要保持源图比例,把参数$percent保持为1即可。
* 即使原比例压缩,也可大幅度缩小。数码相机4M图片。也可以缩为700KB左右。如果缩小比例,则体积会更小。
* 结果:可保存、可直接显示。
*/
class imgcompress{
       private $src;
       private $image;
       private $imageinfo;
       private $percent = 0.5;
       /**
        * 图片压缩
        * @param $src 源图
        * @param float $percent  压缩比例
        */
       public function __construct($src, $percent=1)
       {
              $this->src = $src;
              $this->percent = $percent;
       }
       /** 高清压缩图片
        * @param string $saveName  提供图片名(可不带扩展名,用源图扩展名)用于保存。或不提供文件名直接显示
        */
       public function compressImg($saveName='')
       {
              $this->_openImage();
              if(!empty($saveName)) $this->_saveImage($saveName);  //保存
              else $this->_showImage();
       }
       /**
        * 内部:打开图片
        */
       private function _openImage()
       {
              list($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);
              $this->_thumpImage();
       }
       /**
        * 内部:操作图片
        */
       private function _thumpImage()
       {
              $new_width = $this->imageinfo['width'] * $this->percent;
              $new_height = $this->imageinfo['height'] * $this->percent;
              //保持最大宽度为600
              if($new_width>600){
                  $_percent = 600/$new_width;
                $new_width = $new_width*$_percent;
                $new_height = $new_height*$_percent;
              }
              //end
         
              $image_thump = imagecreatetruecolor($new_width,$new_height);
               imagealphablending($image_thump,false);
              imagesavealpha($image_thump,true);
              //将原图复制带图片载体上面,并且按照一定比例压缩,极大的保持了清晰度
              imagecopyresampled($image_thump,$this->image,0,0,0,0,$new_width,$new_height,$this->imageinfo['width'],$this->imageinfo['height']);
              imagedestroy($this->image);
              $this->image = $image_thump;
       }
       /**
        * 输出图片:保存图片则用saveImage()
        */
       private function _showImage()
       {
              header('Content-Type: image/'.$this->imageinfo['type']);
              $funcs = "image".$this->imageinfo['type'];
              $funcs($this->image);
       }
       /**
        * 保存图片到硬盘:
        * @param  string $dstImgName  1、可指定字符串不带后缀的名称,使用源图扩展名 。2、直接指定目标图片名带扩展名。
        */
       private function _saveImage($dstImgName)
       {
              if(empty($dstImgName)) return false;
              $allowImgs = ['.jpg', '.jpeg', '.png', '.bmp', '.wbmp','.gif'];   //如果目标图片名有后缀就用目标图片扩展名 后缀,如果没有,则用源图的扩展名
              $dstExt =  strrchr($dstImgName ,".");
              $sourseExt = strrchr($this->src ,".");
              if(!empty($dstExt)) $dstExt =strtolower($dstExt);
              if(!empty($sourseExt)) $sourseExt =strtolower($sourseExt);
              //有指定目标名扩展名
              if(!empty($dstExt) && in_array($dstExt,$allowImgs)){
                     $dstName = $dstImgName;
              }elseif(!empty($sourseExt) && in_array($sourseExt,$allowImgs)){
                     $dstName = $dstImgName.$sourseExt;
              }else{
                     $dstName = $dstImgName.$this->imageinfo['type'];
              }
              $funcs = "image".$this->imageinfo['type'];
              $funcs($this->image,$dstName);
       }
       /**
        * 销毁图片
        */
       public function __destruct(){
              imagedestroy($this->image);
       }
}
/*$source = '1.png';
$dst_img = '../copy1.png'; //可加存放路径
$percent = 1;  #原图压缩,不缩放
$image = (new imgcompress($source,$percent))->compressImg($dst_img);*/ 

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