lo passi come querystring dentro all'object e all'embed se c'è, poi recuperi la variabile da _root
Codice PHP:
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" width="100" height="100" codebase="http://fpdownload.adobe.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0">
<param name="movie" value="moviename.swf?variabile=<?php echo "valore"; ?>">
<param name="play" value="true">
<param name="loop" value="true">
<param name="quality" value="high">
<embed src="moviename.swf?variabile=<?php echo "valore"; ?>" width="100" height="100" play="true” loop="true" quality="high" pluginspage="http://www.adobe.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash"></embed>
</object>
in flash ricavi "variabile" con _root.variabile
in alternativa puoi usare le "FlashVars"