Escapa las comillas
$swf[1] =
"<object classid=
'clsid:D27CDB6E-AE6D-11cf-96B8-444553540000
' codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,28,0" width="389" height="60">
<param name="movie" value="flash/enforma.swf" />
<param name="quality" value="high" />
<embed src="flash/enforma.swf" quality="high" pluginspage="http://www.adobe.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash" type="application/x-shockwave-flash" width="389" height="60"></embed>
</object>";
Si abres con comillas dobles (") adentro pone simples (') o (\")