Source of: /manual/en/function.exp.php
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<div id="function.exp" class="refentry">
<div class="refnamediv">
<h1 class="refname">exp</h1>
<p class="verinfo">(PHP 4, PHP 5)</p><p class="refpurpose"><span class="refname">exp</span> — <span class="dc-title">Calculates the exponent of <b><tt class="constant">e</tt></b></span></p>
</div>
<a name="function.exp.description"></a><div class="refsect1 description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">float</span> <span class="methodname"><b>exp</b></span>
( <span class="methodparam"><span class="type">float</span> <tt class="parameter">$arg</tt></span>
)</div>
<p class="para rdfs-comment">
Returns <b><tt class="constant">e</tt></b> raised to the power of <i><tt class="parameter">arg</tt></i>
.
</p>
<blockquote><p><b class="note">Note</b>:
'<b><tt class="constant">e</tt></b>' is the base of the natural system of logarithms, or approximately
2.718282.
<br />
</p></blockquote>
</div>
<a name="function.exp.parameters"></a><div class="refsect1 parameters">
<h3 class="title">Parameters</h3>
<p class="para">
</p><dl>
<dt class="varlistentry">
<span class="term"><i><tt class="parameter">arg</tt></i>
</span>
</dt><dd class="listitem">
<p class="para">
The argument to process
</p>
</dd>
</dl>
<p>
</p>
</div>
<a name="function.exp.returnvalues"></a><div class="refsect1 returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
'e' raised to the power of <i><tt class="parameter">arg</tt></i>
</p>
</div>
<a name="function.exp.examples"></a><div class="refsect1 examples">
<h3 class="title">Examples</h3>
<p class="para">
</p><div class="example">
<p><b>Example #1 <b>exp()</b> example</b></p>
<div class="example-contents programlisting">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB"><?php<br /></span><span style="color: #007700">echo </span><span style="color: #0000BB">exp</span><span style="color: #007700">(</span><span style="color: #0000BB">12</span><span style="color: #007700">) . </span><span style="color: #DD0000">"\n"</span><span style="color: #007700">;<br />echo </span><span style="color: #0000BB">exp</span><span style="color: #007700">(</span><span style="color: #0000BB">5.7</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span>
</span>
</code></div>
</div>
<div class="example-contents para"><p>The above example will output:</p></div>
<div class="example-contents screen">
<div class="cdata"><pre>
1.6275E+005
298.87
</pre></div>
</div>
</div><p>
</p>
</div>
<a name="function.exp.seealso"></a><div class="refsect1 seealso">
<h3 class="title">See Also</h3>
<p class="para">
</p><ul class="simplelist">
<li class="member"><a href="function.log.php" class="function" rel="rdfs-seeAlso">log()</a> - Natural logarithm</li>
<li class="member"><a href="function.pow.php" class="function" rel="rdfs-seeAlso">pow()</a> - Exponential expression</li>
</ul><p>
</p>
</div>
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