That is entirely unsupported code, you may discover issues with scripts in the future.

PHP tags are supported in Custom Islands, syntax would be similar to (this is the Random Gallery image code):
Code
/* YOUR PHP CODE GOES IN THIS TOP SECTION */
$query = "
	SELECT POST_ID, FILE_DIR, FILE_NAME
	FROM {$config['TABLE_PREFIX']}FILES
	WHERE (FILE_DIR <> '' AND FILE_DIR IS NOT NULL)
	  AND (FILE_TYPE = 'jpg'
	   OR FILE_TYPE = 'gif'
	   OR FILE_TYPE = 'jpg'
	   OR FILE_TYPE = 'jpeg'
	   OR FILE_TYPE = 'png')
	ORDER BY rand()
	LIMIT 1
";
$sth = $dbh->do_query($query, __LINE__, __FILE__);
list($postId, $fDir, $fName) = $dbh->fetch_array($sth);

/* YOUR HTML GOES BETWEEN THE EOF HEREDOC BELOW */
$body = <<<EOF
<div class="acvt">
<div style="height:{$config['MAX_THUMB_W_H']}px;overflow:hidden;position:relative;width:100%;display:inline-block;">
<a href="{$config['BASE_URL']}/ubbthreads.php?ubb=showgallery&Number=$postId"><img src="{$config['BASE_URL']}/gallery/$fDir/medium/$fName" alt="" title="" class="p2 cp oi" style="position:absolute;left:-100%;right:-100%;top:-100%;bottom:-100%;margin:auto;max-width:280px;min-height:100%;"></a>
</div>
</div>
EOF;


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