Simple ExpressionEngine plug-in for IE Edge meta stuff

<?php
$plugin_info = Array(
    'pi_name'           => 'IE_Edge',
    'pi_version'        => '0.0.1',
    'pi_author'         => 'Shaun Bebbington',
    'pi_description'    => 'Detect if IE10 or less is detected, and will add <meta http-equiv="X-UA-Compatible" content="IE=edge"> to the header if that\'s what you want.',
    'pi_usage'          => 'Include {exp:ie_edge} below the <meta charset="utf-8"> or similar element'
);
class IE_Edge
{
    /**
     * Here is a simple plug-in for Expression Engine -> description above (see $plugin_info Array)
     *
     * @author      Shaun Bebbington
     * @param       none
     * @date        10 Sep 2014 11:08:05
     * @version     0.0.1
     * @return      string
     */
    public function IE_Edge()
    {
        $this->EE   =& get_instance();
        $browser    = '';
        // Look for IE browsers
        if ( strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') )
        {
            $browser = '<meta http-equiv="X-UA-Compatible" content="IE=edge">';
        }
        $this->return_data = $browser;
    }
}
?>