why does the class_exists function return false?
<p>In the following script I check the <code>class_exists</code> function. What is the scope of this function ? It returns <code>false</code> for this script when I test for this class.</p>

<pre><code>&lt;?php
namespace my;
class Tester {      
    public function check() {
        $classname = 'Tester';
        if(class_exists($classname)) {
            echo "class exists ! &lt;br /&gt;";
        } else {
            echo "class doesn't exist ! &lt;br /&gt;";
        }
    }
}   

$obj = new Tester();
$obj-&gt;check();
</code></pre>

<p><em>Output : class doesn't exist</em></p>
