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Precedence and Associativity

Precedence and Associativity

This lesson discusses two important characteristics of arithmetic operators, i.e., precedence and associativity.

We'll cover the following...

Precedence #

Operator precedence determines which operator is performed first in an expression with more than one operators. Operator precedence in PHP is similar to that of regular arithmetic operators.

  • *, /, % operators have equal precedence.
  • + , - operators have equal precedence.
  • *, / , % have a higher precedence than + , -.

The operator with higher precedence is executed first in the expression.

Associativity #

Associativity is used when two operators of the same precedence appear in an expression.

Left Associativity #

Left associativity occurs when an expression is evaluated from left to right. For example * and / have the same precedence and their associativity is left to right, so the expression ...