sqrt

Function • Params and return types changed in PHP 8.0

Square root.

PHP 5
PHP 7
PHP 8.0
Improved
PHP 8.1
PHP 8.2-8.3
PHP 8.4
PHP 8.5
PHP 8.6

sqrt Function synopsis

sqrt(float $num): float

Parameters

$num

Typefloat

The argument to process

Return value

Typefloat

The square root of $num or the special value NAN for negative numbers.

Changes to the sqrt Function

PHP 8.0

  • Return type added: float
  • Parameter name of parameter #1 changed: $number to $num
  • Parameter type added for parameter #1 ($num): float
- sqrt($number)
+ sqrt(float $num): float

sqrt Function Availability

PHP VersionAvailability
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