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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><title>GetCallback</title><link rel="stylesheet" type="text/css" href="phplotdoc.css" /><meta name="generator" content="DocBook XSL Stylesheets V1.78.1" /><link rel="home" href="index.html" title="PHPlot Reference Manual" /><link rel="up" href="reference.html" title="PHPlot Function Reference" /><link rel="prev" href="EndStream.html" title="EndStream" /><link rel="next" href="GetDeviceXY.html" title="GetDeviceXY" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">GetCallback</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="EndStream.html">Prev</a> </td><th width="60%" align="center">PHPlot Function Reference</th><td width="20%" align="right"> <a accesskey="n" href="GetDeviceXY.html">Next</a></td></tr></table><hr /></div><div class="refentry"><a id="GetCallback"></a><div class="titlepage"></div><div class="refnamediv"><h2><span class="refentrytitle">GetCallback</span></h2><p>GetCallback &#8212; Returns the current callback function registered for the given reason</p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><pre class="synopsis">$plot-&gt;GetCallback(<em class="parameter"><code>$reason</code></em>)</pre></div><div class="refsect1"><a id="idp1377710396"></a><h2>Description</h2><p>
<code class="function">GetCallback</code> returns the current callback function
registered for the given reason.
That is, it returns the function argument value used when a callback
function was registered with <a class="xref" href="SetCallback.html" title="SetCallback"><span class="refentrytitle">SetCallback</span></a>.
    </p></div><div class="refsect1"><a id="idp1377711844"></a><h2>Parameters</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="replaceable"><code>$reason</code></em></span></dt><dd><p>
A PHPlot-defined name for the callback.
See <a class="xref" href="callbacks.html#callbacks-names" title="4.4.3. Available Callbacks">Section 4.4.3, &#8220;Available Callbacks&#8221;</a>.
          </p></dd></dl></div></div><div class="refsect1"><a id="idp1377713700"></a><h2>Return Value</h2><p>
Returns the function name as a string, or a 2-element array
for object instance and method calls.
Returns False if there is no callback registered for this reason,
or if the given reason is not valid.
    </p></div><div class="refsect1"><a id="idp1377714516"></a><h2>Notes</h2><p>
Since no valid function name (or array of object instance and method)
evaluates to false when directly tested, it is not necessary to check
using the identical-to (===) operator.
    </p><p>
Refer to <a class="xref" href="callbacks.html" title="4.4. Callbacks">Section 4.4, &#8220;Callbacks&#8221;</a> for more information on callbacks.
    </p></div><div class="refsect1"><a id="idp1377715892"></a><h2>History</h2><p>
This function and the callbacks implementation were added in PHPlot-5.0.4
as an experimental feature. Callbacks were first documented in this manual
as of PHPlot-5.0.5 and are no longer considered experimental.
    </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="EndStream.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="GetDeviceXY.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">EndStream </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> GetDeviceXY</td></tr></table></div></body></html>