[php-src] Issue #8314: EXP(N) != M_E ** N

Issue: https://github.com/php/php-src/issues/8314 Author: REGZ-PL ### Description The following code: ```php <?PHP FUNCTION _EXP($N) { GLOBAL $E; RETURN M_E ** $N; } ECHO ' EXP(1) = '. EXP(1) . '<br>'; ECHO '_EXP(1) = '. _EXP(1) . '<br><br>'; ECHO '(EXP(1) == _EXP(1)) = ' . (EXP(1) == _EXP(1) ? 'TRUE' : 'FALSE') . '<br><br>'; ECHO ' EXP(2) = '. EXP(2) . '<br>'; ECHO '_EXP(2) = '. _EXP(2) . '<br><br>'; ECHO '(EXP(2) == _EXP(2)) = ' . (EXP(2) == _EXP(2) ? 'TRUE' : 'FALSE') . '<br><br>'; ECHO ' EXP(3) = '. EXP(3) . '<br>'; ECHO '_EXP(3) = '. _EXP(3) . '<br><br>'; ECHO '(EXP(3) == _EXP(3)) = ' . (EXP(3) == _EXP(3) ? 'TRUE' : 'FALSE') . '<br><br>'; ECHO ' EXP(4) = '. EXP(4) . '<br>'; ECHO '_EXP(4) = '. _EXP(4) . '<br><br>'; ECHO '(EXP(4) == _EXP(4)) = ' . (EXP(4) == _EXP(4) ? 'TRUE' : 'FALSE') . '<br><br>'; ``` Resulted in this output: ``` EXP(1) = 2.718281828459 _EXP(1) = 2.718281828459 (EXP(1) == _EXP(1)) = TRUE EXP(2) = 7.3890560989307 _EXP(2) = 7.3890560989306 (EXP(2) == _EXP(2)) = FALSE EXP(3) = 20.085536923188 _EXP(3) = 20.085536923188 (EXP(3) == _EXP(3)) = FALSE EXP(4) = 54.598150033144 _EXP(4) = 54.598150033144 (EXP(4) == _EXP(4)) = FALSE ``` But I expected this output instead: ``` EXP(1) = 2.718281828459 _EXP(1) = 2.718281828459 (EXP(1) == _EXP(1)) = TRUE EXP(2) = 7.3890560989307 _EXP(2) = 7.3890560989307 (EXP(2) == _EXP(2)) = TRUE EXP(3) = 20.085536923188 _EXP(3) = 20.085536923188 (EXP(3) == _EXP(3)) = TRUE EXP(4) = 54.598150033144 _EXP(4) = 54.598150033144 (EXP(4) == _EXP(4)) = TRUE ``` ### PHP Version PHP 8 ### Operating System All