function.atanh.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <title>Inverse hyperbolic tangent</title>  <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.atan.html">atan</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.base-convert.html">base_convert</a></div> <div class="up"><a href="ref.math.html">Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.atanh" class="refentry"> <div class="refnamediv">  <h1 class="refname">atanh</h1>  <p class="verinfo">(PHP 4 &gt;= 4.0.7, PHP 5)</p><p class="refpurpose"><span class="refname">atanh</span> &mdash; <span class="dc-title">Inverse hyperbolic tangent</span></p> </div> <div class="refsect1 description">  <h3 class="title">Description</h3>   <div class="methodsynopsis dc-description">    <span class="type">float</span> <span class="methodname"><b><b>atanh</b></b></span>     ( <span class="methodparam"><span class="type">float</span> <tt class="parameter">$arg</tt></span>    )</div>  <p class="para rdfs-comment">   Returns the inverse hyperbolic tangent of   <i><tt class="parameter">arg</tt></i>, i.e. the value whose   hyperbolic tangent is <i><tt class="parameter">arg</tt></i>.  </p> </div> <div class="refsect1 parameters">  <h3 class="title">Parameters</h3>  <p class="para">   <dl>    <dt>     <span class="term"><i><tt class="parameter">arg</tt></i></span>     <dd>      <p class="para">       The argument to process      </p>     </dd>    </dt>   </dl>  </p> </div> <div class="refsect1 returnvalues">  <h3 class="title">Return Values</h3>  <p class="para">   Inverse hyperbolic tangent of <i><tt class="parameter">arg</tt></i>   </p> </div> <div class="refsect1 changelog">  <h3 class="title">ChangeLog</h3>  <p class="para">   <table class="informaltable">    <colgroup>     <thead valign="middle">      <tr valign="middle">       <th colspan="1">Version</th>       <th colspan="1">Description</th>      </tr>     </thead>     <tbody valign="middle" class="tbody">      <tr valign="middle">       <td colspan="1" rowspan="1" align="left">5.3.0</td>       <td colspan="1" rowspan="1" align="left">         This function is now available on all platforms       </td>      </tr>     </tbody>    </colgroup>   </table>  </p> </div> <div class="refsect1 seealso">  <h3 class="title">See Also</h3>  <p class="para">   <ul class="simplelist">    <li class="member"><a href="function.tanh.html" class="function" rel="rdfs-seeAlso">tanh()</a></li>    <li class="member"><a href="function.atan.html" class="function" rel="rdfs-seeAlso">atan()</a></li>    <li class="member"><a href="function.asinh.html" class="function" rel="rdfs-seeAlso">asinh()</a></li>    <li class="member"><a href="function.acosh.html" class="function" rel="rdfs-seeAlso">acosh()</a></li>   </ul>  </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.atan.html">atan</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.base-convert.html">base_convert</a></div> <div class="up"><a href="ref.math.html">Math Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>

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