1. Good knowledge of php/mysql.
2. Working knowledge in CMS such as joomla/ drupal/ wordpress/ oscommerce and able to customize existing websites.
3. Must be able to quickly understand already written php code, and debug/fix it.
4. Positive knowledge of xhtml/css/javascript.
Desired:
1. Nice to have JQuery/AJAX knowledge.
2. Nice to have experience in PHP frameworks like CakePHP, CodeIgniter, Zend.