Simple PHP thumbnails generation function

Simple PHP thumbnails generation function

A simple thumbnail generation function supports image formats such as gif, jpeg, png, and bmp. it supports scaling to a fixed size or proportional scaling. it supports directly inputting the image to a browser or saving the image to a file. /** * Simple thumbnails generation function (supported Image formats: gif, jpeg, png, and bmp) * @ Authorxiaoshuoit@163.com * @ Paramstring $ src source image path * @ Paramint $ width the width of the thumbnail (proportional scaling is performed only when the height is specified) * @ Paramint $ width the height of the thumbnail (proportional scaling is performed only when the width is specified) * @ Paramstring $ filename storage path (output directly to the browser when not specified) * @ Returnbool */ Function simple_thumb ($ src, $ width = null, $ height = null, $ filename = null ){ If (! Isset ($ width )&&! Isset ($ height )) Return false; If (isset ($ width) & $ width <= 0) Return false; If (isset ($ height) & $ height <= 0) Return false; $ Size = getimagesize ($ src ); If (! $ Size) Return false; List ($ src_w, $ src_h, $ src_type) = $ size; $ Src_mime = $ size ['Mime ']; Switch ($ src_type ){ Case 1: $ Img_type = 'GIF '; Break; Case 2: $ Img_type = 'jpeg '; Break; Case 3: $ Img_type = 'PNG '; Break; Case 15: $ Img_type = 'wbmp '; Break; Default: Return false; } If (! Isset ($ width )) $ Width = $ src_w * ($ height/$ src_h ); If (! Isset ($ height )) $ Height = $ src_h * ($ width/$ src_w ); $ Imagecreatefunc = 'imagecreatefrom '. $ img_type; $ Src_img = $ imagecreatefunc ($ src ); $ Dest_img = imagecreatetruecolor ($ width, $ height ); Imagecopyresampled ($ dest_img, $ src_img, 0, 0, 0, $ width, $ height, $ src_w, $ src_h ); $ Imagefunc = 'image'. $ img_type; If ($ filename ){ $ Imagefunc ($ dest_img, $ filename ); } Else { Header ('content-Type: '. $ src_mime ); $ Imagefunc ($ dest_img ); } Imagedestroy ($ src_img ); Imagedestroy ($ dest_img ); Return true; } Simple_thumb ("http://www.baidu.com/img/bdlogo.gif", 100 ); // Simple_thumb ("img/example.jpg", 100, null, 'IMG/example_thumb.jpg ');