<HTML ><HEAD ><TITLE >sinh</TITLE ><META NAME="GENERATOR" CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK REL="HOME" TITLE="PHP Manual" HREF="index.html"><LINK REL="UP" TITLE="Mathematical Functions" HREF="ref.math.html"><LINK REL="PREVIOUS" TITLE="sin" HREF="function.sin.html"><LINK REL="NEXT" TITLE="sqrt" HREF="function.sqrt.html"><META HTTP-EQUIV="Content-type" CONTENT="text/html; charset=ISO-8859-1"></HEAD ><BODY CLASS="refentry" BGCOLOR="#FFFFFF" TEXT="#000000" LINK="#0000FF" VLINK="#840084" ALINK="#0000FF" ><DIV CLASS="NAVHEADER" ><TABLE SUMMARY="Header navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TH COLSPAN="3" ALIGN="center" >PHP Manual</TH ></TR ><TR ><TD WIDTH="10%" ALIGN="left" VALIGN="bottom" ><A HREF="function.sin.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="80%" ALIGN="center" VALIGN="bottom" ></TD ><TD WIDTH="10%" ALIGN="right" VALIGN="bottom" ><A HREF="function.sqrt.html" ACCESSKEY="N" >Next</A ></TD ></TR ></TABLE ><HR ALIGN="LEFT" WIDTH="100%"></DIV ><H1 ><A NAME="function.sinh" ></A >sinh</H1 ><DIV CLASS="refnamediv" ><A NAME="AEN45255" ></A ><P > (PHP 4 >= 4.1.0)</P >sinh -- Hyperbolic sine</DIV ><DIV CLASS="refsect1" ><A NAME="AEN45258" ></A ><H2 >Description</H2 >float <B CLASS="methodname" >sinh</B > ( float arg)<BR ></BR ><P > Returns the hyperbolic sine of <TT CLASS="parameter" ><I >arg</I ></TT >, defined as <TT CLASS="literal" >(exp(arg) - exp(-arg))/2</TT >. </P ><P > See also <A HREF="function.sin.html" ><B CLASS="function" >sin()</B ></A >, <A HREF="function.asinh.html" ><B CLASS="function" >asinh()</B ></A >, <A HREF="function.cos.html" ><B CLASS="function" >cos()</B ></A > and <A HREF="function.tan.html" ><B CLASS="function" >tan()</B ></A >. </P ></DIV ><DIV CLASS="NAVFOOTER" ><HR ALIGN="LEFT" WIDTH="100%"><TABLE SUMMARY="Footer navigation table" WIDTH="100%" BORDER="0" CELLPADDING="0" CELLSPACING="0" ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" ><A HREF="function.sin.html" ACCESSKEY="P" >Prev</A ></TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="index.html" ACCESSKEY="H" >Home</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" ><A HREF="function.sqrt.html" ACCESSKEY="N" >Next</A ></TD ></TR ><TR ><TD WIDTH="33%" ALIGN="left" VALIGN="top" >sin</TD ><TD WIDTH="34%" ALIGN="center" VALIGN="top" ><A HREF="ref.math.html" ACCESSKEY="U" >Up</A ></TD ><TD WIDTH="33%" ALIGN="right" VALIGN="top" >sqrt</TD ></TR ></TABLE ></DIV ></BODY ></HTML >