PHP has moved back up to take its spot back at #4 with (Visual) Basic falling back down to #5. As the trends graph shows, PHP had a sharp spike back up to overtake VB starting with the new year. If it continues the climb, it could be back up to levels it was during the middle of last year.
The TIOBE Programming Community index gives an indication of the popularity of programming languages. The index is updated once a month. The ratings are based on the worldwide availability of skilled engineers, courses and third party vendors.