php压缩图片大小

<?phprequire_once(dirname(__FILE__).'/imgcompress.class.php');$dir = str_replace("\\", '/', dirname(__FILE__) ).'/image/200/'; $newDir = str_replace("\\", '/', dirname(__FILE__) ).'/newImage/200/';//PHP遍历文件夹下所有文件 $files=opendir($dir."."); while (false !== ($file = readdir($files))) { if ($file != "." && $file != ".." && is_file($dir.$file)) { $source = $dir.$file;$dst_img = $newDir.$file;$percent = 0.6; #原图压缩，不缩放，但体积大大降低 $image = (new imgcompress($source,$percent))->compressImg($dst_img);}} closedir($files);/*** 图片压缩类：通过缩放来压缩。 * 如果要保持源图比例，把参数$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'] * $this->percent;$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 = $image_thump;}/*** 输出图片:保存图片则用saveImage()*/private function _showImage(){header('Content-Type: image/'.$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);}}

　　

转载于:https://www.cnblogs.com/Abner3721/p/9145750.html

总结

以上是生活随笔为你收集整理的php压缩图片大小的全部内容，希望文章能够帮你解决所遇到的问题。

如果觉得生活随笔网站内容还不错，欢迎将生活随笔推荐给好友。