What do I do wrong in this PHP Syntax

Question

could somebody telle me please what is the reason for a critical PHP Error in the following code ?

<?php if(isset($_GET['search-type'])) {
    $type = $_GET['search-type'];
    if($type == 'blog') {?>
    //ARTICLE SEARCH 
<?php
    } else  {?> 
    //GLOBAL SEARCH
 }
?>