I want to know about php scripts to include in custom blocks to show users by criterias, like as: city, country, group, age... The block must search users in the profile module fields (i created the custom fields city, age, ... before) and show users with your avatar and one link to send pm message and one link to profile user. The block must have max number of users to show.

Example:
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|Users of Example City |
| avatar avatar avatar |
|Matthew Mary John|
| pm pm pm|
| see more users|
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OBS: The underlined fileds are hyperlinks. The "see more users" link must go to the result search of users (profile module) showing users from "Example City".