tanh             2885 ext/standard/basic_functions.c 	PHP_FE(tanh,															arginfo_tanh)
tanh              514 ext/standard/math.c PHP_FUNCTION(tanh)
tanh              521 ext/standard/math.c 	RETURN_DOUBLE(tanh(num));
tanh               80 ext/standard/php_math.h PHP_FUNCTION(tanh);