Assignments

Multiple Assignment

A variable can be assigned value multiple times.

Let's look at this example:

<?php $num = 1; echo $num; $num = 2; $num = 5; echo $num; $anotherNum = $num; $anotherNum = $anotherNum + 2; // 5 + 2 echo $anotherNum;

Output:

1 5 7

In this case $num has been assigned value multiple times.

Variables can be assigned values of other variables (line 9).

Also a variable can receive a new value by using it's current value (line 10).

Assignment operators

They assign values and make the code shorter.

+= operator

$num += 2 is the same as $num = $num + 2.

Example:

<?php $num = 3; $num += 1; echo $num;

Output:

4

-= operator

$num -= 5 is the same as $num = $num - 5.

Example:

<?php $num = 4; $num -= 3; echo $num;

Output:

1

*= operator

$num *= 7 is the same as $num = $num * 7.

Example:

<?php $num = 8; $num *= 3; echo $num;

Output:

24

/= operator

$num /= 10 is the same as $num = $num / 10.

Example:

<?php $num = 24; $num /= 4; echo $num;

Output:

6