Chapter 10. Operators
Table of Contents
Operator Precedence
Arithmetic Operators
Assignment Operators
Bitwise Operators
Comparison Operators
Error Control Operators
Execution Operators
Incrementing/Decrementing Operators
Logical Operators
String Operators
Array Operators
Type Operators
An operator is something that you feed with one or more values
(or expressions, in programming jargon) which yields another
value (so that the construction itself becomes an expression).
So you can think of functions or constructions that return
a value (like print) as operators and those that return nothing
(like echo) as any other thing.
There are three types of operators. Firstly there is the
unary operator which operates on only one value, for example
! (the negation operator) or ++ (the increment operator).
The second group are termed binary operators; this group
contains most of the operators that PHP supports, and a
list follows below in the section Operator Precedence.
The third group is the ternary operator: ?:. It should
be used to select between two expressions depending on a
third one, rather than to select two sentences or paths
of execution. Surrounding ternary expressions with parentheses
is a very good idea.
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