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<title>Hyperbolic tangent</title>
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<h1 class="refname">tanh</h1>
<p class="verinfo">(PHP 4 >= 4.1.0, PHP 5)</p><p class="refpurpose"><span class="refname">tanh</span> — <span class="dc-title">Hyperbolic tangent</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.tanh-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">float</span> <span class="methodname"><strong>tanh</strong></span>
( <span class="methodparam"><span class="type">float</span> <code class="parameter">$arg</code></span>
)</div>
<p class="para rdfs-comment">
Returns the hyperbolic tangent of <em><code class="parameter">arg</code></em>,
defined as <em>sinh(arg)/cosh(arg)</em>.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.tanh-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">arg</code></em></span>
<dd>
<p class="para">
The argument to process
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.tanh-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
The hyperbolic tangent of <em><code class="parameter">arg</code></em>
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.tanh-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.tan.html" class="function" rel="rdfs-seeAlso">tan()</a> - Tangent</span></li>
<li class="member"> <span class="function"><a href="function.atanh.html" class="function" rel="rdfs-seeAlso">atanh()</a> - Inverse hyperbolic tangent</span></li>
<li class="member"> <span class="function"><a href="function.sinh.html" class="function" rel="rdfs-seeAlso">sinh()</a> - Hyperbolic sine</span></li>
<li class="member"> <span class="function"><a href="function.cosh.html" class="function" rel="rdfs-seeAlso">cosh()</a> - Hyperbolic cosine</span></li>
</ul>
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