WordPress: Add Button to the Visual Editor (TinyMCE)

For some reason, the <hr> tag (horizontal rule) is not enabled by default on the WordPress Visual (TinyMCE) Editor. Fortunately it is very easy to enable, with a little addition to your functions.php file.

function enable_more_buttons($buttons) {
$buttons[] = 'hr';

/*
Repeat with any other buttons you want to add, e.g.
$buttons[] = 'fontselect';
$buttons[] = 'sup';
*/

return $buttons;
}
add_filter("mce_buttons", "enable_more_buttons");

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