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<title>Sets up callback for variable change notification</title>
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<h1 class="refname">gupnp_service_proxy_add_notify</h1>
<p class="verinfo">(PECL gupnp >= 0.1.0)</p><p class="refpurpose"><span class="refname">gupnp_service_proxy_add_notify</span> — <span class="dc-title">Sets up callback for variable change notification</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.gupnp-service-proxy-add-notify-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type">bool</span> <span class="methodname"><strong>gupnp_service_proxy_add_notify</strong></span>
( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$proxy</code></span>
, <span class="methodparam"><span class="type">string</span> <code class="parameter">$value</code></span>
, <span class="methodparam"><span class="type">int</span> <code class="parameter">$type</code></span>
, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$callback</code></span>
[, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$arg</code></span>
] )</div>
<p class="para rdfs-comment">
Sets up callback to be called whenever a change notification for variable is recieved.
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.gupnp-service-proxy-add-notify-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">proxy</code></em></span>
<dd>
<p class="para">
A service proxy identifier.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">value</code></em></span>
<dd>
<p class="para">
The variable to add notification for.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">type</code></em></span>
<dd>
<p class="para">
The type of the variable. Type can be one of the following values:
<dl>
<dt>
<span class="term"><strong><code>GUPNP_TYPE_BOOLEAN</code></strong></span>
<dd>
<span class="simpara">
Type of the variable is boolean.
</span>
</dd>
</dt>
<dt>
<span class="term"><strong><code>GUPNP_TYPE_INT</code></strong></span>
<dd>
<span class="simpara">
Type of the variable is integer.
</span>
</dd>
</dt>
<dt>
<span class="term"><strong><code>GUPNP_TYPE_LONG</code></strong></span>
<dd>
<span class="simpara">
Type of the variable is long.
</span>
</dd>
</dt>
<dt>
<span class="term"><strong><code>GUPNP_TYPE_DOUBLE</code></strong></span>
<dd>
<span class="simpara">
Type of the variable is double.
</span>
</dd>
</dt>
<dt>
<span class="term"><strong><code>GUPNP_TYPE_FLOAT</code></strong></span>
<dd>
<span class="simpara">
Type of the variable is float.
</span>
</dd>
</dt>
<dt>
<span class="term"><strong><code>GUPNP_TYPE_STRING</code></strong></span>
<dd>
<span class="simpara">
Type of the variable is string.
</span>
</dd>
</dt>
</dl>
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">callback</code></em></span>
<dd>
<p class="para">
The callback to call when variable changes. Typically, callback function
takes on three parameters. The <em><code class="parameter">variable</code></em>
parameter being the first, <em><code class="parameter">value</code></em> parameter
being the second, and the <em><code class="parameter">arg</code></em> is third.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">arg</code></em></span>
<dd>
<p class="para">
User data for <em><code class="parameter">callback</code></em>.
</p>
</dd>
</dt>
</dl>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.gupnp-service-proxy-add-notify-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns <strong><code>TRUE</code></strong> on success or <strong><code>FALSE</code></strong> on failure.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.gupnp-service-proxy-add-notify-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.gupnp-service-proxy-remove-notify.html" class="function" rel="rdfs-seeAlso">gupnp_service_proxy_remove_notify()</a> - Cancels the variable change notification</span></li>
</ul>
</p>
</div>
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