= 1` in my PHP document mean?

2018-05-29 14:00:02

I have the following variable defined in a PHP document I am working with, and I'm unsure what it means.

The PHP

$page -= 1;

The part I am unsure of is the -=

Thanks!

The -= operator is shorthand for subtracting a value from the variable:

$x -= 1;
$x = $x - 1;

Here's some of the other ones:

$x += 1; ( $x = $x + 1 )

$x -= 1; ( $x = $x - 1 )

$x *= 1; ( $x = $x * 1 )

$x /= 1; ( $x = $x / 1 )

It's a shorthand to save typing. It's effect is idential to

$page = $page - 1;

The -= operator is a combination arithmetic and assignment operator. It subtracts 1 then reassigns it to $page .

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