if you want to resize only use some thing like this: include the class

require ('resize_img.php');

then create new class

$imgresize = new resize_img();

then determine the size

$imgresize->sizelimit_x = 100;
$imgresize->sizelimit_y = 100;

you can do this to keep proportions

$imgresize->keep_proportions = true;

now resize

if( $imgresize->resize_image( 'jooria.gif' ) === TRUE ){       
     $imgresize->output_resizedimage();   
}

then unset the Memory

$imgresize->destroy_resizedimage();