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<title>"Adds" two variant values together and returns the result</title>
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<h1 class="refname">variant_add</h1>
<p class="verinfo">(PHP 5)</p><p class="refpurpose"><span class="refname">variant_add</span> — <span class="dc-title">"Adds" two variant values together and returns the result</span></p>
</div>
<div class="refsect1 description" id="refsect1-function.variant-add-description">
<h3 class="title">Description</h3>
<div class="methodsynopsis dc-description">
<span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <span class="methodname"><strong>variant_add</strong></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">$left</code></span>
, <span class="methodparam"><span class="type"><a href="language.pseudo-types.html#language.types.mixed" class="type mixed">mixed</a></span> <code class="parameter">$right</code></span>
)</div>
<p class="para rdfs-comment">
Adds <em><code class="parameter">left</code></em> to <em><code class="parameter">right</code></em> using
the following rules (taken from the MSDN library), which correspond to
those of Visual Basic:
<table class="doctable table">
<caption><strong>Variant Addition Rules</strong></caption>
<thead>
<tr>
<th>If</th>
<th>Then</th>
</tr>
</thead>
<tbody class="tbody">
<tr>
<td>Both expressions are of the string type</td>
<td>Concatenation</td>
</tr>
<tr>
<td>One expression is a string type and the other a
character</td>
<td>Addition</td>
</tr>
<tr>
<td>One expression is numeric and the other is a string</td>
<td>Addition</td>
</tr>
<tr>
<td>Both expressions are numeric</td>
<td>Addition</td>
</tr>
<tr>
<td>Either expression is NULL</td>
<td>NULL is returned</td>
</tr>
<tr>
<td>Both expressions are empty</td>
<td>Integer subtype is returned</td>
</tr>
</tbody>
</table>
</p>
</div>
<div class="refsect1 parameters" id="refsect1-function.variant-add-parameters">
<h3 class="title">Parameters</h3>
<p class="para">
<dl>
<dt>
<span class="term"><em><code class="parameter">left</code></em></span>
<dd>
<p class="para">
The left operand.
</p>
</dd>
</dt>
<dt>
<span class="term"><em><code class="parameter">right</code></em></span>
<dd>
<p class="para">
The right operand.
</p>
</dd>
</dt>
</dl>
<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
As with all the variant arithmetic functions, the parameters for this function
can be either a PHP native type (integer, string, floating point, boolean or
<strong><code>NULL</code></strong>), or an instance of a COM, VARIANT or DOTNET class. PHP native types
will be converted to variants using the same rules as found in the constructor
for the <a href="class.variant.html" class="xref">VARIANT</a> class. COM and DOTNET objects
will have the value of their default property taken and used as the variant value.
</p>
<p class="para">
The variant arithmetic functions are wrappers around the similarly named
functions in the COM library; for more information on these functions, consult
the MSDN library. The PHP functions are named slightly differently; for example
<span class="function"><strong>variant_add()</strong></span> in PHP corresponds to <em>VarAdd()
</em> in the MSDN documentation.
</p>
</p></blockquote>
</p>
</div>
<div class="refsect1 returnvalues" id="refsect1-function.variant-add-returnvalues">
<h3 class="title">Return Values</h3>
<p class="para">
Returns the result.
</p>
</div>
<div class="refsect1 seealso" id="refsect1-function.variant-add-seealso">
<h3 class="title">See Also</h3>
<p class="para">
<ul class="simplelist">
<li class="member"> <span class="function"><a href="function.variant-sub.html" class="function" rel="rdfs-seeAlso">variant_sub()</a> - Subtracts the value of the right variant from the left variant value</span></li>
</ul>
</p>
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