with add_query_arg
the first paramater is required and it must be an array when it is alone :
add_query_arg([])
more informations here :
http://developer.wordpress.org/reference/functions/add_query_arg
with add_query_arg
the first paramater is required and it must be an array when it is alone :
add_query_arg([])
more informations here :
http://developer.wordpress.org/reference/functions/add_query_arg