<?php namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig; use PhpOffice\PhpSpreadsheet\Calculation\Exception; class Sign { /** * SIGN. * * Determines the sign of a number. Returns 1 if the number is positive, zero (0) * if the number is 0, and -1 if the number is negative. * * @param float $number Number to round * * @return int|string sign value, or a string containing an error */ public static function evaluate($number) { try { $number = Helpers::validateNumericNullBool($number); } catch (Exception $e) { return $e->getMessage(); } return Helpers::returnSign($number); } }