$imgSrc=ImageCreateFromJPEG($picName); $imgResized=ImageCreate($w,$h);
$size = GetImageSize($picName);

imagecopyresized($imgResized, $imgSrc, 0, 0, 0, 0, $w,$h, $size[0], $size[1]);

ImageJPEG($imgResized);

imagedestroy etc etc etc ....