Php uses GD to create a method for maintaining the aspect ratio thumbnail

This article describes how to use GD to create a height-to-height ratio thumbnail in php. It involves the skills of using the GD library to operate images in php. For more information, see

This article describes how to use GD to create a height-to-height ratio thumbnail in php. It involves the skills of using the GD library to operate images in php. For more information, see

This example describes how to use GD to create a thumbnail with a aspect ratio. Share it with you for your reference. The details are as follows:

/*** Create a thumbnail image from $ inputFileName no taller or wider than * $ maxSize. returns the new image resource or false on error. * Author: mthorn.net */function thumbnail ($ inputFileName, $ maxSize = 100) {$ info = getimagesize ($ inputFileName ); $ type = isset ($ info ['type'])? $ Info ['type']: $ info [2]; // Check support of file type if (! (Imagetypes () & $ type) {// Server does not support file typereturn false;} $ width = isset ($ info ['width'])? $ Info ['width']: $ info [0]; $ height = isset ($ info ['height'])? $ Info ['height']: $ info [1]; // Calculate aspect ratio $ wRatio = $ maxSize/$ width; $ hRatio = $ maxSize/$ height; // Using imagecreatefromstring will automatically detect the file type $ sourceImage = imagecreatefromstring (file_get_contents ($ inputFileName); // Calculate a proportional width and height no larger than size. if ($ width <= $ maxSize) & ($ height <= $ maxSize) {// Input is sma Roller than thumbnail, do nothingreturn $ sourceImage;} elseif ($ wRatio * $ height) <$ maxSize) {// Image is horizontal $ tHeight = ceil ($ wRatio * $ height); $ tWidth = $ maxSize ;} else {// Image is vertical $ tWidth = ceil ($ hRatio * $ width); $ tHeight = $ maxSize ;}$ thumb = imagecreatetruecolor ($ tWidth, $ tHeight ); if ($ sourceImage = false) {// cocould not load imagereturn false;} // Copy resampled make S a smooth thumbnail imagecopyresampled ($ thumb, $ sourceImage, 0, 0, 0, $ tWidth, $ tHeight, $ width, $ height); imagedestroy ($ sourceImage); return $ thumb ;} /*** Save the image to a file. type is determined from the extension. * $ quality is only used for every S. * Author: mthorn.net */function imageToFile ($ im, $ fileName, $ quality = 80) {if (! $ Im | file_exists ($ fileName) {return false;} $ ext = strtolower (substr ($ fileName, strrpos ($ fileName ,'. '); switch ($ ext) {case '.gif': imagegif ($ im, $ fileName); break; case '.jpg ': case '.jpeg': imagejpeg ($ im, $ fileName, $ quality); break; case '.png ': imagepng ($ im, $ fileName); break; case '.bmp': imagewbmp ($ im, $ fileName); break; default: return false;} return true;} $ im = thumbnail('temp.jpg ', 100); imageToFile ($ im, 'temp-thumbnail.jpg ');

I hope this article will help you with php programming.

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