json foreach,如何分别获取每一个坐标值？

Question

我用JSON_DECODE已经获取了某个json tree里的值。但是三个中括号把我给弄糊涂了。json tree               "bounding_box": {
                    "coordinates": [
                        [
                            [
                                8.7059311,
                                45.1613624
                            ],
                            [
                                9.551564,
                                45.1613624
                            ],
                            [
                                9.551564,
                                45.643543
                            ],
                            [
                                8.7059311,
                                45.643543
                            ]
                        ]
                    ],
我需要分别获取没一个坐标值。但是下面的代码，只能获取前2个值。如何分别获取其他的？
 foreach ($data['bounding_box']['coordinates'] as $data) 
  $s1= $data[0][0].'<br />';// 8.7059311 ， $s1， $s2， $s3， $s4都是经度
  $t1= $data[0][1].'<br />';//45.1613624 ， $t1， $t2， $t3， $t4 都是纬度
我最终想分别获取 $s1，$s2，$s3，$s4，$t1，$t2，$t3，$t4的值，然后将每一个值，提交到GOOGLE自定义地图里。谢谢。 

Answer 1

大概这个思路$n = count($data['bounding_box']['coordinates']);
$arr_s = $arr_t = array();
for($i = 0; $i < $n; $i++){
$arr_s['s' . ($i + 1)] = $data['bounding_box']['coordinates'][$i][0];
$arr_t['t' . ($i + 1)] = $data['bounding_box']['coordinates'][$i][1];
}
extract($arr_s);
extract($arr_t);