php中使用gd库实现远程图片下载实例
author:一佰互联 2019-04-28   click:145

因为今天想写个远程下载图片的类,提前热身写了个php gd库实现远程图片下载功能,当然curl实现更好,php gd库实现远程图片下载功能主要使用gd库的两个函数ImageCreateFromXXX()用于生成图片函数和ImageXXX函数,XXX表示不同图片的扩展名,所以你要想办法获取远程图片的扩展名了,附上php代码如下:

<?phpheader("Content-type:text/html ; charset=utf-8"); if (!empty($_POST["submit"])){ $url = $_POST["url"]; $pictureName = $_POST["pictureName"]; $img = getPicture($url,$pictureName); echo "<pre><img src="".$img.""></pre>"; }function getPicture($url,$pictureName){ if ($url == "") return false; //获取图片的扩展名 $info = getimagesize($url); $mime = $info["mime"]; $type = substr(strrchr($mime,"/"), 1); //不同的图片类型选择不同的图片生成和保存函数 switch($type){ case "jpeg":  $img_create_func = "imagecreatefromjpeg";  $img_save_func = "imagejpeg";  $new_img_ext = "jpg";  break; case "png":  $img_create_func = "imagecreatefrompng";  $img_save_func = "imagepng";  $new_img_ext = "png";  break; case "bmp":  $img_create_func = "imagecreatefrombmp";  $img_save_func = "imagebmp";  $new_img_ext = "bmp";  break; case "gif":  $img_create_func = "imagecreatefromgif";  $img_save_func = "imagegif";  $new_img_ext = "gif";  break; case "vnd.wap.wbmp":  $img_create_func = "imagecreatefromwbmp";  $img_save_func = "imagewbmp";  $new_img_ext = "bmp";  break; case "xbm":  $img_create_func = "imagecreatefromxbm";  $img_save_func = "imagexbm";  $new_img_ext = "xbm";  break; default:  $img_create_func = "imagecreatefromjpeg";  $img_save_func = "imagejpeg";  $new_img_ext = "jpg";    } if ($pictureName == ""){ $pictureName = time().".{$new_img_ext}"; }else{ $pictureName = $pictureName.".{$new_img_ext}"; } $src_im = $img_create_func($url); //由url创建新图片 $img_save_func($src_im, $pictureName); //输出文件到文件 return $pictureName;} ?><form method="POST" action="">远程url地址:<input type="text" name="url" size=20 /><br />文件名称:<input type="text" name="pictureName" size=20 /><input type="submit" name="submit" value="下载" /></form>

运行结果如下图:(图片自动保存在当前文件目录,不明白的可以留言)