Index[A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [L] [M] [N] [O] [P] [Q] [R] [S] [T] [U] [V] [W] [Z] objects databases, modifying one-to-many relationships one-to-one relationships OOP (Object-Oriented programming) classes creating instances constructors methods static variables references static open source operators ? (question mark) operator arguments assignment associativity binary categories comparison conditional equality expressions and implicit casting logical operands number of types of order of precedence PHP assignment decrement increment relational ternary unary ORDER BY keyword order of precedence, operators organization of book output, HTML and |