亲，帮忙给看看这个类哪里出有关问题了？出不来表格啊

亲，帮忙给看看这个类哪里出问题了？出不来表格啊？？？
class Create{
var $i;
var $j;
function table(){
echo "";
if($a=1;$a<=$i;$a++){
echo "";
if($b=1;$b<=$j;$b++){
echo "";
}
echo "";
}
echo "

$nbsp;

";
}
}
$table=new Create();
$table->i=3;
$table->j=4;
$table->table();
?>

------解决方案--------------------
本帖最后由 xuzuning 于 2013-02-01 10:56:02 编辑

class Create{
var $i;
var $j;
function table(){
echo "";
for($a=1;$a<=$this->i;$a++){
echo "";
for($b=1;$b<=$this->j;$b++){
echo "";
}
echo "";
}
echo "";
}
}
$table=new Create();
$table->i=3;
$table->j=4;
$table->table();