In this tutorial, you shall learn about Addition Assignment Operator, its syntax, and how to use this operator in programs, with examples.

PHP – Addition Assignment Operator

Addition assignment operator is used to increase the value in a variable by given value.

The operator takes two operands, and assigns the sum of both the operands to the first operand.

Syntax

The syntax of using Addition Assignment Operator is

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operand1 += operand2

The operation would be similar to the following statement.

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operand1 = operand1 + operand2

which translates to the meaning of increasing or incrementing the value of operand1 by the value of operand2.

We can use variable for operand1; variable or value for operand2.

Example

In the following example, we use Addition Assignment Operator to increase the value in variable $x by 10.

PHP Program

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<?php
$x = 41;

$x += 10;
print_r("Now, x is {$x}.");
?>

Output