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Assignment operators are used with:

integer

and

float

values to write / update a variable value. Simple Assignment

$y = 9;
$x = $y;
echo $x . "\n";

Addition

$x = 40; $y = 9;
$x += $y; // same as: $x = $x + $y
echo $x . "\n";

Subtraction

$x = 40; $y = 9;
$x -= $y; // $x = $x - $y
echo $x . "\n";

Multiplication

$x = 40; $y = 9;
$x *= $y; // $x = $x * $y
echo $x . "\n";

Division

$x = 40; $y = 9;
$x /= $y; // $x = $x / $y
echo $x . "\n";

Modulus

$x = 40; $y = 9;
$x %= $y; // $x = $x % $y
echo $x . "\n";

by Valeri Tandilashvili

PHP

Pro tip: use ```triple backticks around text``` to write in code fences