Numeric operation using string
<p>I have following string.</p>

<pre><code>$option = '+';
$value = '100';
</code></pre>

<p>I want create new value using above parameters. </p>

<p>ex:- <code>$newValue = 222 + 100;</code></p>

<p>How can i do it using above parameters? as following</p>

<pre><code>$newValue = 222 $option $value; 
</code></pre>
