Let me get this straight. You are a:
Consultant IT guy who sometimes codes in PERL, PHP, C, C++, BASIC, FORTRAN, COBOLwho now, after twenty years experience, wants to give up using all these languages and become a PHP specialist because of a single PHP test result? Go for it! :)
Seriously, I wouldn't let the test result influence your decision. For me, such a choice would depend on economic factors, and on how much I enjoyed PHP compared to the other languages.
A few years back, I was astonished to find myself leading a PHP code golf competition despite being a complete PHP beginner! Rather than draw the conclusion that I was a "PHP natural" and should therefore "forsake Perl for where my abilities seem to lie", I concluded that the average PHP golfer was of a much lower standard than the average Perl, Python and Ruby golfer. Like LanX, I am not in awe of the technical abilities of the average PHP programmer. :)