Hi,
$quicksearch in this example is effectively an array, you will need to do something like
$qsArr = explode(" ", $quicksearch);
this will then make 'garden' and 'bt4' available under $qsArr as $qsArr[0] and $qsArr[1].
You can therefore do
$searcher ="(pg5 like '%$quicksearch%' OR pprice like '%$quicksearch%' OR pprice like '%$quicksearch%' OR paddress1 like '%$quicksearch%' OR paddress2 like '%$quicksearch%' OR ppostcode like '%$qsArr[1]%' OR pbrief like '%$qsArr[0]%' )
";
I hope this helps. Of course you will find that if you add additional words in there, you will need to expand on this, but that should be the general gist of what you need.
Jeff