I would wrap the whole thing in a class and put your data into a class var.
class WPA69616_Plugin {
private $data="";
public function __construct() {
add_shortcode('my_shortcode', array($this, 'add_content'));
add_action('wp_footer', array($this, 'output_content'));
}
public function add_content($atts) {
extract( shortcode_atts( array(
'content' => ''
), $atts ) );
$this->data .= $content;
}
public function output_content() {
echo $this->data;
}
}
$wpa69616_plugin = new WPA69616_Plugin();
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