Who uses Java, Perl, PHP?

Do you recognize on photos, who is using which programming language?

Here are some pictures of the teams participating on the plat_forms contest 2007, a programming (language) contest which compares different web development platforms/languages.

On three platforms enough teams comply with the requirements: Java, Perl and PHP (in alphabetical order). See the three selected teams of each platform below, but without their platform name. Then guess & vote, what language they are using ;-)