usually when many quotes are involved i put them in single quotes as such :
$str = 'this "is great" cuz "<b>i am strong</b>"';
or
'this is'.$a.'"blah"'.$yoda.'hi "friend"';
but yes, i can see how such things could be useful and would be interested to know of such an option. also consider EOT :
$str = <<<EOT
anything in here
""""""""""<b>blah</b>"""""""
""<b>more blah</b>" 'hi
EOT;