If you are a plugin developer, you should be aware of the new update system that is being integrated into GetSimple 3.1. Starting with this release, the GetSimple installation will now notify a user when a new version of that particular plugin is available for download within Extend. These steps will help you as a developer to ensure that your plugin is compatible with this new process.

Determining the GetSimple version is not as straight forward as it could be, as the only available function in 2.03 - return_site_ver() - outputs the version in 2.03 and returns it in 3.0b (deprecated here). The easiest way to find out, if a plugin is installed on GetSimple 2.03 or 3.0+ seems to be

$isV3 = function_exists('get_site_version');

The probably most correct one is (only use within function, in order not to pollute the global name space!)

include(GSADMININCPATH.'configuration.php');
$version = GSVERSION;

To trigger a function myplugin_function on page deletes in GetSimple 2.03 and 3.0+ use the following code:

// GetSimple 3.0+
add_action('page-delete', 'myplugin_function'); 

// GetSimple 2.03
if (!function_exists('get_site_version') && basename($_SERVER['PHP_SELF']) == 'deletefile.php') {
  myplugin_function();
}

This describes how to display messages in back-end plugin pages. Assume you have 3 variables, $isSuccess, $canUndo and $msg holding the message. To display the message for your plugin myplugin, add the following code to your plugin:

<?php 
  if (isset($msg)) {
    if ($canUndo) $msg .= ' <a href="load.php?id=myplugin&undo">' . i18n_r('UNDO') . '</a>' 
?>
<script type="text/javascript">
  $(function() {
    $('div.bodycontent').before('<div class="<?php echo $isSuccess ? 'updated' : 'error'; ?>" style="display:block;">'+
            <?php echo json_encode($msg); ?>+'</div>');
    $(".updated, .error").fadeOut(500).fadeIn(500);
  });
</script>
<?php 
  } 
?>