PHP Operator Precedence

In this chapter you will learn:

1. What is Operator Precedence
2. A list of the operators in order of precedence (highest first):
3. Use parentheses to overwrite Operator Precedence

Description

An operator with a higher precedence is executed before an operator with lower precedence. For example,

In the case of the example, * has a higher precedence than + , so PHP multiplies 4 by 5 first, then adds 3 to the result to get 23.

Precedence of Some PHP Operators (Highest First)

A list of the operators in order of precedence (highest first):

++  --  (increment/decrement)    /*from ja  va  2s . com*/
(int) (float) (string) (array) (object) (bool) (casting)    
! (not)    
* / % (arithmetic)    
+  -  . (arithmetic)    
<     < =  >     > =  <  >  (comparison)    
== != === !== (comparison)    
&&  (and)    
|| (or)    
= +=  - = *= /= .= %= (assignment)    
and     
xor    
or    

Parentheses

You can affect the order of execution of operators in an expression by using parentheses. So, for example, the following expression evaluates to 35:

Next chapter...

What you will learn in the next chapter:

1. What is Code Blocks
2. Syntax to create PHP code blocks
3. Example - Use code block with if statement

PHP Assignment Operators

PHP Arithmetic Operators

PHP Incrementing and Decrementing Operators

PHP Comparison Operators

PHP Logical Operators

PHP String Operators

PHP Ternary Operator

PHP Bitwise Operators

PHP Execution Operator

PHP Operator Precedence