phppreg_replace正则替换图片路径

$str &＃61; &＃39;
test1,.
test2,
test3,&＃39;;
print "\n|"."****原串*****************************************************"."\n";
echo $str."\n";
print "\n"."\n"."**********替换后***********************************************"."\n";
//$parm &＃61; &＃39;/()/i&＃39;;
$parm &＃61; &＃39;///$replacy &＃61; array(&＃39;${1}&＃39;,"http://baidu.com/uc/upload",&＃39;${1}&＃39;);
$replacy &＃61; &＃39;http://baidu.com/uc/uploads/&＃39;;
$re &＃61; preg_replace($parm,$replacy,$str,-1);
print $re;
print "\n";
echo $re[0];
print "\n";