<?php
$size=GetImageSize ("photo.jpg");
$src=ImageCreateFromJPEG ("photo.jpg");
$iw=$size[0];
$ih=$size[1];
$koe=$iw/150;
$new_h=ceil ($ih/$koe);
$dst=ImageCreateTrueColor (150, $new_h);
ImageCopyResampled ($dst, $src, 0, 0, 0, 0, 150, $new_h, $iw, $ih);
ImageJPEG ($dst, "small_photo.jpg", 100);
imagedestroy($src);
?>