The filter wp_title changes only the function wp_title() when it’s called.
So, you must double check on your theme’s source code if before your header is using wp_title.
Anyway, you can set your filter on functions.php. A function to identify your param GET should be something like so:
function maybe_change_wp_title_ver( $title, $sep ) {
if ( isset( $_GET['title_ver'] ) && 1 === $_GET['title_ver'] ) {
$title="My New Title";
}
return $title;
}
add_filter( 'wp_title', 'maybe_change_wp_title_ver', 99, 2 ); //99 is set as priority (read comments)
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