As katana said the php code is there so that the file can function as a phpnuke block.
But you can still use the clock, it is merely a flash file. Just get the flash file (upload it to site), which should have been provided with the script (blackw_clock.swf) and embed it in your webpage, using the following code
PHP Code:
<OBJECT classid=\"clsid27CDB6E-AE6D-11cf-96B8-444553540000\" codebase=\"http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=6,0,0,0\"
WIDTH=\"150\" HEIGHT=\"150\" id=\"relogio\" ALIGN=\"\">
<PARAM NAME=\"movie\" VALUE=\"blackw_clock.swf\">
<PARAM NAME=\"quality\" VALUE=\"high\">
<PARAM NAME=\"bgcolor\" VALUE=\"#000000\">
<PARAM NAME=\"wmode\" VALUE=\"transparent\">
<PARAM NAME=\"menu\" VALUE=\"false\">
<EMBED src=\"blackw_clock.swf\" quality=\"high\" bgcolor=\"#000000\" WIDTH=\"150\"
HEIGHT=\"150\" wmode=\"transparent\" ALIGN=\"\" TYPE=\"application/x-shockwave-flash\"
PLUGINSPAGE=\"http://www.macromedia.com/go/getflashplayer\" menu=\"false\">
</EMBED></OBJECT>
(which is all html code)
Set the correct path to the swf file on these lines
PHP Code:
<PARAM NAME=\"movie\" VALUE=\"blackw_clock.swf\">
PHP Code:
<EMBED src=\"blackw_clock.swf\"
Change the background color of the clock on these lines
PHP Code:
<PARAM NAME=\"bgcolor\" VALUE=\"#000000\">
PHP Code:
<EMBED src=\"blackw_clock.swf\" quality=\"high\" bgcolor=\"#000000\"
Changing the parameters in both references will increase the likelihood of compatability in most browsers.
etc.