PHP 忒聊 綴豖 ヶ輛 atanh (PHP 4 = 4.1.0) Description Returns the inverse hyperbolic tangent of arg, i.e. the value whose hyperbolic tangent is arg. 蛁: 蜆滲杅祥巠蚚衾 Windows す怢ㄐ See also atan(), asinh() and acosh(). 綴豖 れ萸 ヶ輛 atan 奻珨撰 base_convert