php把json資料匯入mysql資料失敗解決方案

php把json資料匯入mysql資料失敗
先說下我做的原理吧：
1、先把json轉換成數組；
2、在把數組中的我需要是資料提取下，組成我要是sql語句中VALUES的一部分，提取的這部分我存成一個數組；
3、由於上面提取VALUES是一個數組，我用for迴圈執行sql語句，但是提示i沒有定義
大家看看怎麼回事

require ('inc/config.php');
require (MYSQL);
$data ='[{"date":"2014-09-06","num":151,"area":18017.24},{"date":"2014-09-07","num":103,"area":11703.9},{"date":"2014-09-08","num":66,"area":7378.92},{"date":"2014-09-09","num":192,"area":22160.96},{"date":"2014-09-10","num":183,"area":22059.72},{"date":"2014-09-11","num":184,"area":21212.68},{"date":"2014-09-12","num":119,"area":13960.93},{"date":"2014-09-13","num":0,"area":0},{"date":"2014-09-14","num":43,"area":5056.19},{"date":"2014-09-15","num":121,"area":12867.43},{"date":"2014-09-16","num":93,"area":8755.81},{"date":"2014-09-17","num":80,"area":9035.69},{"date":"2014-09-18","num":158,"area":17613.12},{"date":"2014-09-19","num":112,"area":12180.37},{"date":"2014-09-20","num":74,"area":8614.02},{"date":"2014-09-21","num":95,"area":10305.27},{"date":"2014-09-22","num":258,"area":30695.9},{"date":"2014-09-23","num":155,"area":17457.88},{"date":"2014-09-24","num":148,"area":16792.02},{"date":"2014-09-25","num":167,"area":20203.15},{"date":"2014-09-26","num":174,"area":20055.03},{"date":"2014-09-27","num":138,"area":15927.18},{"date":"2014-09-28","num":175,"area":19372.63},{"date":"2014-09-29","num":277,"area":30226.38},{"date":"2014-09-30","num":311,"area":33082.01},{"date":"2014-10-01","num":88,"area":9456.33},{"date":"2014-10-02","num":92,"area":9384.07},{"date":"2014-10-03","num":70,"area":7780.39},{"date":"2014-10-04","num":71,"area":7620.61},{"date":"2014-10-05","num":44,"area":4672.24}]';

$array = json_decode($data, true);
//print_r ($array);
$values = array();  

foreach ($array as $k => $v) {
//echo "('" . $k . "', '" . $v . "')";
//echo $v."
";
//echo $v['date'].$v['num'].$v['area']."
";
$values[] = "('" . $v['date'] . "', " . $v['num'] . ", " . $v['area'] . ")";
} 

for ($i=0; $i<=100; $i++) {
$q = "INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, $values[i], NOW())";
}
$r = mysqli_query ($conn, $q) or trigger_error("Query: $q\n
MySQL Error: " . mysqli_error($conn));
if (mysqli_affected_rows($conn) == 1) {
echo '這條資料已經添加成功';
} else {
echo '程式發生錯誤，請重新添加'; 
}

?>

------解決思路----------------------

$data ='[{"date":"2014-09-06","num":151,"area":18017.24},{"date":"2014-09-07","num":103,"area":11703.9},{"date":"2014-09-08","num":66,"area":7378.92},{"date":"2014-09-09","num":192,"area":22160.96},{"date":"2014-09-10","num":183,"area":22059.72},{"date":"2014-09-11","num":184,"area":21212.68},{"date":"2014-09-12","num":119,"area":13960.93},{"date":"2014-09-13","num":0,"area":0},{"date":"2014-09-14","num":43,"area":5056.19},{"date":"2014-09-15","num":121,"area":12867.43},{"date":"2014-09-16","num":93,"area":8755.81},{"date":"2014-09-17","num":80,"area":9035.69},{"date":"2014-09-18","num":158,"area":17613.12},{"date":"2014-09-19","num":112,"area":12180.37},{"date":"2014-09-20","num":74,"area":8614.02},{"date":"2014-09-21","num":95,"area":10305.27},{"date":"2014-09-22","num":258,"area":30695.9},{"date":"2014-09-23","num":155,"area":17457.88},{"date":"2014-09-24","num":148,"area":16792.02},{"date":"2014-09-25","num":167,"area":20203.15},{"date":"2014-09-26","num":174,"area":20055.03},{"date":"2014-09-27","num":138,"area":15927.18},{"date":"2014-09-28","num":175,"area":19372.63},{"date":"2014-09-29","num":277,"area":30226.38},{"date":"2014-09-30","num":311,"area":33082.01},{"date":"2014-10-01","num":88,"area":9456.33},{"date":"2014-10-02","num":92,"area":9384.07},{"date":"2014-10-03","num":70,"area":7780.39},{"date":"2014-10-04","num":71,"area":7620.61},{"date":"2014-10-05","num":44,"area":4672.24}]';
 
$array = json_decode($data, true);
$values = array();  
 
foreach ($array as $k => $v) {
    $values[] = "'" . $v['date'] . "', " . $v['num'] . ", " . $v['area'] . "";
} 
 
for ($i=0; $i    $q = "INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, ".$values[$i].", NOW())";
    echo $q.'
';
}

測試了下，沒有問題啊。

INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, '2014-09-06', 151, 18017.24, NOW())
INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, '2014-09-07', 103, 11703.9, NOW())
INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, '2014-09-08', 66, 7378.92, NOW())
INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, '2014-09-09', 192, 22160.96, NOW())
INSERT INTO f_chengjiao (city_id, fang_time, taoshu, area, os_time) VALUES (1, '2014-09-10', 183, 22059.72, NOW())
