Search and str_replace

[BBR-APBT]

Ok re-ordered to place it just below

{vb:raw ad_location.ad_footer_start}
{vb:raw ad_location.global_above_footer}

and above

<div class="footercontainer">

This should do the trick.

$find = '<div class="footercontainer">';
$replace = "{vb:raw my_text}". PHP_EOL;
$output = str_replace($find,$replace.$find, $output);