You are return two times! The first return exit the function, so your shortcode outputs always “Hello World”.
Correct code:
function hello( $atts ) {
extract( shortcode_atts( array(
'foo' => 'something',
'bar' => 'something else',
), $atts ) );
print_r($atts); // Remove, when you are fine with your atts!
return 'Hello, World: '.$atts['foo'];
}
add_shortcode('hw', 'hello');
For the second question: do a print_r($atts)
after the extracts part!
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