atan2

Function • Params and return types changed in PHP 8.0

Arc tangent of two variables.

PHP 5

PHP 7

Improved

PHP 8.1

PHP 8.2-8.3

PHP 8.4

PHP 8.5

PHP 8.6

`atan2` Function synopsis

atan2(float $y, float $x): float

Parameters

`$y`

Typefloat

Dividend parameter

`$x`

Typefloat

Divisor parameter

Return value

Typefloat

The arc tangent of $y/$x in radians.

Changes to the `atan2` Function

PHP 8.0

Return type added: float
Parameter type added for parameter #1 ($y): float
Parameter type added for parameter #2 ($x): float

- atan2($y, $x)
+ atan2(float $y, float $x): float

`atan2` Function Availability

PHP Version	Availability
PHP 8.6Upcoming Release	Yes
PHP 8.5Supported (Latest)	Yes
PHP 8.4Supported	Yes
PHP 8.3Security-Fixes Only	Yes
PHP 8.2Security-Fixes Only	Yes
PHP 8.1Unsupported	Yes
PHP 8.0Unsupported	Yes
PHP 7.4Unsupported	Yes
PHP 7.3Unsupported	Yes
PHP 7.2Unsupported	Yes
PHP 7.1Unsupported	Yes
PHP 7.0Unsupported	Yes
PHP 5.6Unsupported	Yes
PHP 5.5Unsupported	Yes
PHP 5.4Unsupported	Yes
PHP 5.3Unsupported	Yes