php-doc-en/reference/math/functions/exp.xml

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<refentry id="function.exp">
 <refnamediv>
  <refname>exp</refname>
  <refpurpose>Calculates the exponent of <constant>e</constant></refpurpose>
 </refnamediv>
 <refsect1>
  <title>Description</title>
   <methodsynopsis>
    <type>float</type><methodname>exp</methodname>
    <methodparam><type>float</type><parameter>arg</parameter></methodparam>
   </methodsynopsis>
  <para>
   Returns <constant>e</constant> raised to the power of <parameter>arg</parameter>.
  </para>
  <note>
   <para>
    'e' is the base of the natural system of logarithms, or approximately
    2.718282.
   </para>
  </note>
  <para>
   <example>
    <title><function>exp</function> example</title>
    <programlisting role="php">
<![CDATA[
<?php
echo exp(12) . "\n";
echo exp(5.7);
?>
]]>
    </programlisting>
    &example.outputs;
    <screen>
<![CDATA[
1.6275E+005
298.87
]]>
    </screen>
   </example>
  </para>
  <para>
   See also 
   <function>log</function> and
   <function>pow</function>.
  </para>
 </refsect1>
</refentry>

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