/*打开图片*/ $src = "aa.jpg"; $info = getimagesize($src); $type = image_type_to_extension($info[2],false); $fun = "imagecreatefrom".$type; $image = $fun($src); /*操作图片*/ //1.内存中建立一个300,200真色彩图片 $image_thumb = imagecreatetruecolor(200,300); //2.核心步骤，将原图复制到真色彩图片上 imagecopyresampled($image_thumb, $image, 0, 0, 0, 0, 200, 300, $info[0], $info[1]); //3.销毁原始图片 imagedestroy($image); /*输出图片*/ //浏览器 header("content-type:".$info['mime']); $fun = "image".$type; $fun($image_thumb); //保存图片 $fun($image_thumb,'aa_a.'.$type); /*销毁图片*/ imagedestroy($image_thumb);