Shortcode API: How to get name that matched shortcode RegEx?

I think you just forgot to run the shortcodes [foo a="b"] and [bar a="c"] through the do_shortcode filter:

do_shortcode( '[foo a="b"] [bar a="c"]' )

The output of the_content() is filtered through the do_shortcode, so you can just add it into your editor instead.

Running your code I get the following output for the $arguments dump:

array (size=1)
  'a' => string 'b' (length=1)

and

array (size=1)
  'a' => string 'c' (length=1)

so there’s no '0' => 'bar' part here.

But you can get the current shortcode tag from the third parameter of the shortcode callback ( I first heard about it in this answer by @toscho )

I just checked the source and if we check out the do_shortcode_tag function we will find:

// self-closing tag
return $m[1] . call_user_func( $shortcode_tags[$tag], $attr, null,  $tag ) . $m[6];

where $tag is the third parameter containing the shortcode tag.

So in your case you can change your callback to:

function foo( $attributes = array(), $content = null, $tag = '' ) {

    echo $tag; // current shortcode tag

    echo '<pre>';
    var_dump($attributes);
    echo '</pre>';
}

to get information about the current shortcode tag.

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