Simple php-generated thumbnail function

Simple generation of thumbnail functions, support image format: GIF, JPEG, PNG and BMP, support zoom to fixed size or zoom, support direct input to browser or save to file. /** * Simple generation of thumbnail functions (supported image formats: GIF, JPEG, PNG, and BMP) * @authorxiaoshuoit @163.com * @paramstring $src Source picture path * @paramint $width thumbnail width (equal to zoom only when height is specified) * @paramint $width thumbnail height (equal to zoom only when width is specified) * @paramstring $filename save path (direct output to browser if not specified) * @returnbool */ function Simple_thumb ($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, 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", +, NULL, ' img/example_thumb.jpg '); Copy Code

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