The gd library is used in php to implement remote image download instances,

The gd library is used in php to implement remote image download instances,

Because today I want to write a remote image download class, I have prepared a php gd library in advance to implement the remote image download function. Of course, curl is better, the remote image download function of the php gd library mainly uses the two functions ImageCreateFromXXX () of the gd library to generate image functions and ImageXXX functions. XXX indicates the extensions of different images, so you have to find a way to get the extension of the remote image. The php code is attached as follows:

<? Phpheader ("Content-type: text/html; charset = UTF-8"); if (! Empty ($ _ POST ['submit ']) {$ url = $ _ POST ['url']; $ pictureName = $ _ POST ['picturename']; $ img = getPicture ($ url, $ pictureName); echo '<pre>  </pre>';} function getPicture ($ url, $ pictureName) {if ($ url =" ") return false; // get the image extension $ info = getimagesize ($ url); $ mime = $ info ['mime ']; $ type = substr (strrchr ($ mime, '/'), 1); // function for generating and saving different image types: switch ($ type) {case 'jpeg ': $ img_create_f Unc = '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 = 'category '; $ img_save_func = 'imagexbm '; $ new_img_ext = 'xbm'; break; default: $ img_create_func = 'hangzhou'; $ img_save_func = 'imagejpeg '; $ new_img_ext = 'jpg ';} if ($ pictureName = "") {$ pictureName = t Ime (). ". {$ new_img_ext} ";} else {$ pictureName = $ pictureName. ". {$ new_img_ext} ";}$ src_im = $ img_create_func ($ url); // create a new image from the url $ img_save_func ($ src_im, $ pictureName ); // output the file to the file return $ pictureName;}?> <Form method = "POST" action = ""> remote url: <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 running result is as follows: (the image is automatically saved in the current file directory. If you do not understand it, leave a message)