wp_get_attachment_image() not working when trying to add width and height attributes

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As written in the documentation, there are no attributes width and height in the fourth parameter of the function. What you might want to do is this:

wp_get_attachment_image(
    $id,
    array( 10, 10 )
);

An alternative and recommended way is to define an image size which will lead WordPress to generate a thumbnail for this size on upload. 

add_action( 'after_setup_theme', 'wpse_132171_create_image_size' );
function wpse_132171_create_image_size() {

    add_theme_support( 'post-thumbnails' );
    add_image_size( 'my_size', 10, 10 ); 
}

With that, you can refer to that size by the slug my_size in wp_get_attachment_image():

wp_get_attachment_image( $id, 'my_size' );

For this solution you should rebuild your thumbnails if you have existing images using a plugin like »AJAX Thumbnail Rebuild«

Note: When you use an array as 2nd argument, WordPress will use attachment-{$val1}x{$val2} (a string built from the array values) as class. This behavior breaks as soon as you use the 4th argument (array attributes) and add a custom class key there. The custom class will override what is delivered by core. This could be considered to be a bug.

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