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)