WordPress image resize

Exactly the same!

It work now!
But what’s the difference?

In my function.php file I have these line of code:

// Enable thumbnails
add_theme_support( 'post-thumbnails' );
set_post_thumbnail_size(180, auto, true); // Normal post thumbnails

// Create custom sizes
// This is then pulled through to your theme useing the_post_thumbnail('custombig');
if ( function_exists( 'add_image_size' ) ) {
	add_image_size('single-post-thumbnail', 500, auto, true); //narrow column
}

//Custom admin sizes
add_image_size('tiny-thumb', 180, auto, true);
add_image_size('normal-thumb', 500, auto, true);

function custom_wmu_image_sizes($sizes) {
       unset( $sizes['thumbnail']);
       unset( $sizes['medium']);
       unset( $sizes['large']);

       $myimgsizes = array(
              "tiny-thumb" => __( "Miniatura" ),
              "normal-thumb" => __( "Normale" ),
       );
       $newimgsizes = array_merge($sizes, $myimgsizes);
       return $newimgsizes;
}
add_filter('image_size_names_choose', 'custom_wmu_image_sizes');

And in my index.php I have these:

<?php the_post_thumbnail( array(180,auto) ); ?>

To recall the function!

I think the problem was in the first two rules of my function file telling that the thumbnail size has to have 180, auto, true… It’s possible?

And how can I get a output code without the specification of height and width for my img elements? Because now the elements contain already a resized img.

I use the value auto with the array and it work! Only the string ‘normal-thumb’ in the place of that array doesn’t work. Thank you very much for the help and for the free time you have donated to me.

Regards