PHP Programmers Responsibilities

This topic was raised in separate comments on posts about interviews for hiring PHP-programmers, but I think that it is worthy of a separate discussion.

If you read job advertisements, then besides PHP and MYSQL directly, employers require a lot of other knowledge and skills. Knowledge of layout, and valid (css, html), good knowledge of javascript, XML, often AJAX, less often, but it also happens - flash and graphic editors, administration of UNIX systems.

But the ads do not always reflect reality - sometimes they are staff managers and during the interview it turns out that not all of the above is really needed, and sometimes the organization already in the search process realizes that it simply cannot find a specialist who would simultaneously be ZCE, an expert on valid layout and a good designer at the same time.
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What skills are required from a PHP programmer in your organization? Of course, the question is addressed to PHP programmers or to those who work with them nearby. What besides PHP itself are PHP programmers doing? I understand that in an office of two people and somewhere in Google, their duties may be very different, but this is interesting.