Quick and easy function to check if a plugin/theme/whatever has add/registered a shortcode in WordPress:
function is_shortcode_defined($shortcode)
{
global $shortcode_tags;
if(isset($shortcode_tags[$shortcode]))
return TRUE;
else
return FALSE;
}
Just add this into your plugin or theme’s functions.php and wherever you need to check if the shortcode exists, just call is_shortcode_defined(“button”); or something similar from an if statement, as such:
if( ! is_shortcode_defined("button") )
{
add_shortcode("button", "my_button_function");
}
Hope this helps.
