Using GD Library in PHP to implement remote picture download instance _php instance

Because today want to write a remote download the picture class, warm up in advance write a PHP GD library to achieve remote picture download function, of course, curl to achieve better, PHP GD library to achieve remote picture download function of the main use of the GD library two functions imagecreatefromxxx () Used to generate picture functions and imagexxx functions, XXX represents the extension of different pictures, so you have to find a way to get the extension of the remote picture, with the PHP code as follows:

<?php header ("content-type:text/html;
 
Charset=utf-8 ");
 if (!empty ($_post[' submit ')) {$url = $_post[' url '];
 $pictureName = $_post[' picturename '];
 $img = Getpicture ($url, $pictureName); Echo ' <pre></pre> ';
 The function getpicture ($url, $pictureName) {if ($url = = "") return false;
 Gets the extension of the picture $info = getimagesize ($url);
 $mime = $info [' MIME '];
 $type = substr (STRRCHR ($mime, '/'), 1);
  Different picture types choose different pictures to generate and save function 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); Create a new picture from the URL $img _save_func ($src _im, $pictureName);
Output file to file return $pictureName; ?> <form method= "POST" action= "" > Remote URL Address: <input type= "text" name= "url" size=20/><br/> File name: ; input type= "text" name= "Picturename" size=20/> <input type= "Submit" name= "submit" value= "Download"/> </form>

The results of the operation are as follows: (the picture is automatically saved in the current file directory, do not understand can leave a message)