From the web:
Player's Handbook is the indispensable encyclopedia of fantasy
role-playing and also the perfect companion to the referee's 2nd Edition
Dungeon Master's Guide. Everything players need is here: how to
determine a character's Strength, Wisdom, Charisma, etc.
From the book's Foreword (p. 3):
Rest assured that this is still the same version of the AD&D game
that your friends, classmates, and business partners have been playing
for years.
Yes, there are some small and subtle changes in the rules, but you
would have to read the whole book very carefully, and have a tremendous
memory, to find them. (The changes are the sorts of minor corrections
and clarifications we make every time we reprint and we've reprinted
both the Player’s Handbook® and Dungeon Master Guide™ more than 10 times since 1989!)
So what has changed? Obviously, the books look different. We were
awfully proud of them when they released in 1989, but the world doesn't
stand still for anyone. We decided that after six years, it was time for
a new look.
And as long as AD&D was getting a new suit of clothes we elected
to let out the seams a bit, too. Both books are a lot bigger: 25% more
pages in the PHB, 33% more in the DMG. And we used
them up just looking good. Inside you'll find bigger illustrations, lots
more color, and pages that are easy to read.