<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<title>Bollinger Bands</title>
</head>
<body><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.trader-avgprice.html">trader_avgprice</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.trader-beta.html">trader_beta</a></div>
<div class="up"><a href="ref.trader.html">Trader Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div><hr /><div id="function.trader-bbands" class="refentry">
<div class="refnamediv">
<h1 class="refname">trader_bbands</h1>
<p class="verinfo">(PECL trader >= 0.2.0)</p><p class="refpurpose"><span class="refname">trader_bbands</span> — <span class="dc-title">Bollinger Bands</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.trader-bbands-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">array</span> <span class="methodname"><strong>trader_bbands</strong></span>
( <span class="methodparam"><span class="type">array</span> <code class="parameter">$real</code></span>
[, <span class="methodparam"><span class="type">integer</span> <code class="parameter">$timePeriod</code></span>
[, <span class="methodparam"><span class="type">float</span> <code class="parameter">$nbDevUp</code></span>
[, <span class="methodparam"><span class="type">float</span> <code class="parameter">$nbDevDn</code></span>
[, <span class="methodparam"><span class="type">integer</span> <code class="parameter">$mAType</code></span>
]]]] )</div>
<p class="para rdfs-comment">
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.trader-bbands-parameters">
<h3 class="title">Parameters</h3>
<dl>
<dt>
<span class="term"><em><code class="parameter">real</code></em></span>
<dd>
<p class="para">
Array of real values.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">timePeriod</code></em></span>
<dd>
<p class="para">
Number of period. Valid range from 2 to 100000.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">nbDevUp</code></em></span>
<dd>
<p class="para">
Deviation multiplier for upper band. Valid range from <a href="trader.constants.html#constant.trader-real-min" class="link">TRADER_REAL_MIN</a> to <a href="trader.constants.html#constant.trader-real-max" class="link">TRADER_REAL_MAX</a>.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">nbDevDn</code></em></span>
<dd>
<p class="para">
Deviation multiplier for lower band. Valid range from <a href="trader.constants.html#constant.trader-real-min" class="link">TRADER_REAL_MIN</a> to <a href="trader.constants.html#constant.trader-real-max" class="link">TRADER_REAL_MAX</a>.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">mAType</code></em></span>
<dd>
<p class="para">
Type of Moving Average. <a href="trader.constants.html" class="link">TRADER_MA_TYPE_*</a> series of constants should be used.
</p>
</dd>
</dt>
</dl>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.trader-bbands-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">Returns an array with calculated data or false on failure.</p>
</div>
</div><hr /><div class="manualnavbar" style="text-align: center;">
<div class="prev" style="text-align: left; float: left;"><a href="function.trader-avgprice.html">trader_avgprice</a></div>
<div class="next" style="text-align: right; float: right;"><a href="function.trader-beta.html">trader_beta</a></div>
<div class="up"><a href="ref.trader.html">Trader Functions</a></div>
<div class="home"><a href="index.html">PHP Manual</a></div>
</div></body></html>
