# PHP Operators

**PHP Operators**

- An operator is
a special symbol that performs specific operations on one, two, or three
operands and then returns a result.
- Operators can
be grouped according to the number of values they take.
- Unary operators
take only one value, for example, ++ (the increment operator).
- Binary
operators take two values, for example, arithmetic operators familiars like + (plus)
and - (minus), and the majority of PHP operators.

**Operator Precedence**

- The precedence
of an operator specifies how deeply it binds two expressions together. For
example, in the expression 1 + 3 * 2, the answer is 7 and
not 8 because the multiplication (*) operator has higher precedence
than the addition (+) operator. Parentheses may be used to force precedence, if
necessary. For instance: (1 + 2) * 2 evaluates to 8.
- When operators
have equal precedence, their associativity decides how the operators are
grouped. For example, "-" is left-associative, so 1 - 2 - 3 is
grouped as (1 - 2) - 3 and evaluates to -4. "=" on the
other hand, is right-associative, so $a = $b = $c is grouped as $a
= ($b = $c).
**Note:**Non-associative Operators of equal precedence cannot be used next to each other, for example, 1 < 2 > 1 is illegal in PHP. The expression 1 <= 1 == 1 on the other hand is legal because the == operator has lower precedence than the <= operator.- Associativity
is only meaningful for binary (and ternary) operators. Unary operators are
either prefix or postfix so this notion is not applicable. For example !!$a can
only be grouped as !(!$a).
- The use of
parentheses, even when not strictly necessary, can often increase the readability
of the code by making grouping explicit rather than relying on the implicit
operator precedence and associativity.

- Operator precedence and associativity only determine how expressions are grouped; they do not specify an order of evaluation. In PHP there are different types of operators

- Arithmetic operators
- Assignment operators
- Comparison operators
- Increment/Decrement operators
- Logical operators
- String operators
- Array operators
- Conditional
assignment operators

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