关于二维数组。解决办法

关于二维数组。

<?php
	$group1 = array(
            ("name"=>"zs","age"=>"10","sex"=>"nan"),
            ("name"=>"zs","age"=>"10","sex"=>"nan"),
            ("name"=>"zs","age"=>"10","sex"=>"nan"),
            ("name"=>"ls","age"=>"11","sex"=>"nan"),
            ("name"=>"ww","age"=>"12","sex"=>"nv"),
            ("name"=>"ls","age"=>"11","sex"=>"nan"),
            ("name"=>"ww","age"=>"12","sex"=>"nv"),
            ("name"=>"ls","age"=>"11","sex"=>"nan"),
            ("name"=>"ww","age"=>"12","sex"=>"nv")
	);

	echo '<table border="1" width="800" align>';
	echo '<caption><h1>数组转化为表格</h1><caption>';

	foreach( $group as $row ){
		echo '<tr>';
		foreach( $row as $col ){
			echo '<td>{$col}</td>';
		}
		echo '</tr>';
	}
	echo '</table>';
?>

这样写为何不对？
------解决方案--------------------

	$group = array(
            array("name"=>"zs","age"=>"10","sex"=>"nan"),
            array("name"=>"zs","age"=>"10","sex"=>"nan"),
            array("name"=>"zs","age"=>"10","sex"=>"nan"),
            array("name"=>"ls","age"=>"11","sex"=>"nan"),
            array("name"=>"ww","age"=>"12","sex"=>"nv"),
            array("name"=>"ls","age"=>"11","sex"=>"nan"),
            array("name"=>"ww","age"=>"12","sex"=>"nv"),
            array("name"=>"ls","age"=>"11","sex"=>"nan"),
            array("name"=>"ww","age"=>"12","sex"=>"nv")
	);

	echo '<table border="1" width="800" align>';
	echo '<caption><h1>数组转化为表格</h1><caption>';

	foreach( $group as $row ){
		echo '<tr>';
		foreach( $row as $col ){
			echo "<td>{$col}</td>";
		}
		echo '</tr>';
	}
	echo '</table>';