how was it marketed?
Through trailers, release of posters, release of a video game version , a Lego model of Hogwarts and a series of action figures.
Harry Potter and the Order of the Phoenix (film)
The first trailer was released on 17 November 2006, attached to another WB film, "Happy Feet". It was made available online on 20 November 2006, on the "Happy Feet" website. The international trailer debuted online on 22 April 2007 at 14:00 UTC. On 4 May 2007, the US trailer was shown before "Spider-Man 3".

Three posters released on the Internet that showed Harry accompanied by six classmates, including Hermione Granger, generated some controversy by the media. They were essentially the same picture, though one advertised the IMAX release. In one poster, the profile of Hermione, played by Emma Watson, was made curvier as the outline of her breasts was enhanced. Melissa Anelli, webmistress of noted fan site The Leaky Cauldron, wrote:

The video game version, designed by EA UK, was released 25 June 2007. Lego produced just one set, a model of Hogwarts, the lowest number of sets for a film so far. NECA produced a series of action figures, while a larger array of smaller figures was also 
harry potter cast in order of the phoenix Daniel Radcliffe , Rupert Grint, Emma Watson and others. when was the film 'harry potter and the order of the phoenix' released? 11 July 2007 in North America and 12 July 2007 in the United Kingdom. what are the names of some of the characters? Harry Potter, Ron Weasley , Hermione Granger and others. who is the director? David Yates. what is the 'order of the phoenix'? It is a secret organisation founded by Albus Dumbledore. who is the author? J.K.Rowling. who were the members of the order? Albus Dumbledore, Severus Snape, Minerva McGonagall, Rubeus Hagrid, Sirius Black, Remus Lupin,  Fred and George Weasley and others. what's the author's full name? Joanne Rowling. where was the movie filmed? Live-action filming took place in England and Scotland for exterior locations and Leavesden Film Studios in Watford for interior locations who was in-charge of the visual effects? Double Negative company. who composed the music? Nicholas Hooper. what is the name of the soundtrack? Variations of "Hedwig's Theme", "Divine Crusade", "DNA Reactor", and "Boys Will Be Boys".
wiki:20220961
Harry Potter and the Order of the Phoenix (film) [SEP] Marketing
The first trailer was released on 17 November 2006, attached to another WB film, "Happy Feet". It was made available online on 20 November 2006, on the "Happy Feet" website. The international trailer debuted online on 22 April 2007 at 14:00 UTC. On 4 May 2007, the US trailer was shown before "Spider-Man 3". Three posters released on the Internet that showed Harry accompanied by six classmates, including Hermione Granger, generated some controversy by the media. They were essentially the same picture, though one advertised the IMAX release. In one poster, the profile of Hermione, played by Emma Watson, was made curvier as the outline of her breasts was enhanced.