This line is your issue:
$log_string += "Dealing with " . count($atts) . " tab(s)\n";
It should be:
$log_string .= "Dealing with " . count($atts) . " tab(s)\n";
It looks like you confused the javascript and PHP concatenation operator. Don’t worry, it’s something I’ve done numerous times! Ugh!
Edit: Actually, looks like you’ve made this mistake on other lines as well.
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