Using php to generate thumbnails [recommended]

Function ResizeImage ($ im, $ maxwidth, $ maxheight, $ name ){
$ Width = imagesx ($ im );
$ Height = imagesy ($ im );
If ($ maxwidth & $ width> $ maxwidth) | ($ maxheight & $ height> $ maxheight )){
If ($ maxwidth & $ width> $ maxwidth ){
$ Widthratio = $ maxwidth/$ width;
$ RESIZEWIDTH = true;
}
If ($ maxheight & $ height> $ maxheight ){
$ Heightratio = $ maxheight/$ height;
$ RESIZEHEIGHT = true;
}
If ($ RESIZEWIDTH & $ RESIZEHEIGHT ){
If ($ widthratio <$ heightratio ){
$ Ratio = $ widthratio;
} Else {
$ Ratio = $ heightratio;
}
} Elseif ($ RESIZEWIDTH ){
$ Ratio = $ widthratio;
} Elseif ($ RESIZEHEIGHT ){
$ Ratio = $ heightratio;
}
$ Newwidth = $ width * $ ratio;
$ Newheight = $ height * $ ratio;
If (function_exists ("imagecopyresampled ")){
$ Newim = imagecreatetruecolor ($ newwidth, $ newheight );
Imagecopyresampled ($ newim, $ im, 0, 0, 0, 0, $ newwidth, $ newheight, $ width, $ height );
} Else {
$ Newim = imagecreate ($ newwidth, $ newheight );
Imagecopyresized ($ newim, $ im, 0, 0, 0, 0, $ newwidth, $ newheight, $ width, $ height );
}
ImageJpeg ($ newim, $ smalladdrname. $ name. ". jpg ");
ImageDestroy ($ newim );
} Else {
ImageJpeg ($ im, $ smalladdrname. $ name. ". jpg ");
}
}

 

If ($ _ FILES ['image'] ['size']) {
If ($ _ FILES ['image'] ['type'] = "image/pjpeg "){
$ Im = imagecreatefromjpeg ($ bigaddrname. $ exname );
} Elseif ($ _ FILES ['image'] ['type'] = "image/x-png "){
$ Im = imagecreatefrompng ($ bigaddrname. $ exname );
} Elseif ($ _ FILES ['image'] ['type'] = "image/gif "){
$ Im = imagecreatefromgif ($ bigaddrname. $ exname );
}
If ($ im ){
If (file_exists ($ smalladdrname. ". jpg ")){

Unlink ($ smalladdrname. ". jpg ");
}
ResizeImage ($ im, $ RESIZEWIDTH, $ RESIZEHEIGHT, $ smalladdrname );
ImageDestroy ($ im );
}