我的数据库中存储了一个JSON字符串
[{"Dish_ID":"99","Dish_Name":"Luke Warm Water (Glass-ml)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"40","Dish_Name":"Anwla juice(Glass-ml)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"42","Dish_Name":"Aloevera juice(Glass-ml)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"100","Dish_Name":"Methi Kadha(Cup-ml)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"147","Dish_Name":"Herbal Tea(Cup-ml)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"7","Dish_Name":"Sprout(-Bowl)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"8","Dish_Name":"Steam sprout(-bowl)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"22","Dish_Name":"Upma(-bowl)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"21","Dish_Name":"Uttapam(-Pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"71","Dish_Name":"Veg chilla(Plate-Piece)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"73","Dish_Name":"Suji chilla(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"69","Dish_Name":"Dhokla(Plate-Piece)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"88","Dish_Name":"Veg poha (Plate-gm)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"76","Dish_Name":"Fruit salad(-BOWL)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"43","Dish_Name":"Apple(Plate-Piece)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"44","Dish_Name":"Orange(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"45","Dish_Name":"Papaya(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"46","Dish_Name":"Guava(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"50","Dish_Name":"Pear(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"62","Dish_Name":"Kakadi(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"63","Dish_Name":"Cucumber(Plate-Piece)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"64","Dish_Name":"Mausami(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"65","Dish_Name":"Grapes(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"66","Dish_Name":"Malta(-pcs.)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"81","Dish_Name":"Black grapes(Bowl-gm)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"80","Dish_Name":"Falsa(-BOWL)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"82","Dish_Name":"Kiwis(-PCS)","Diet_Type":"Suggested","Quantity":"1"},{"Dish_ID":"40","Dish_Name":"Anwla juice(Glass-ml)","Diet_Type":"Focus","Quantity":"1"},{"Dish_ID":"42","Dish_Name":"Aloevera juice(Glass-ml)","Diet_Type":"Focus","Quantity":"1"},{"Dish_ID":"100","Dish_Name":"Methi Kadha(Cup-ml)","Diet_Type":"Focus","Quantity":"1"},{"Dish_ID":"7","Dish_Name":"Sprout(-Bowl)","Diet_Type":"Focus","Quantity":"1"},{"Dish_ID":"2","Dish_Name":"Tea(-cup)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"1","Dish_Name":"Biscuit(Plate-Piece)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"3","Dish_Name":"Bread(Plate-Piece)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"120","Dish_Name":"BUTTER(Spoon-gm)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"121","Dish_Name":"JAM(Spoon-gm)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"122","Dish_Name":"Coffee(Cup-ml)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"211","Dish_Name":"Fast Food(Plate-Piece)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"156","Dish_Name":"Packed Juices (Glass-ml)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"160","Dish_Name":"Oily Foods(Plate-gm)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"159","Dish_Name":"Refined Flour(Plate-gm)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"162","Dish_Name":"Sweets(Plate-Piece)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"155","Dish_Name":"Beverages(Plate-Piece)","Diet_Type":"Restricted","Quantity":"0"},{"Dish_ID":"157","Dish_Name":"Spreaders (Plate-gm)","Diet_Type":"Restricted","Quantity":"0"},{"time":"09:30 AM"}]
使用json_decode（'json_string'，TRUE）函数将其解码为数组时，我得到的是有效数组
Array
(
[0] => Array
(
[Dish_ID] => 99
[Dish_Name] => Luke Warm Water (Glass-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[1] => Array
(
[Dish_ID] => 40
[Dish_Name] => Anwla juice(Glass-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[2] => Array
(
[Dish_ID] => 42
[Dish_Name] => Aloevera juice(Glass-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[3] => Array
(
[Dish_ID] => 100
[Dish_Name] => Methi Kadha(Cup-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[4] => Array
(
[Dish_ID] => 147
[Dish_Name] => Herbal Tea(Cup-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[5] => Array
(
[Dish_ID] => 7
[Dish_Name] => Sprout(-Bowl)
[Diet_Type] => Suggested
[Quantity] => 1
)
[6] => Array
(
[Dish_ID] => 8
[Dish_Name] => Steam sprout(-bowl)
[Diet_Type] => Suggested
[Quantity] => 1
)
[7] => Array
(
[Dish_ID] => 22
[Dish_Name] => Upma(-bowl)
[Diet_Type] => Suggested
[Quantity] => 1
)
[8] => Array
(
[Dish_ID] => 21
[Dish_Name] => Uttapam(-Pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[9] => Array
(
[Dish_ID] => 71
[Dish_Name] => Veg chilla(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[10] => Array
(
[Dish_ID] => 73
[Dish_Name] => Suji chilla(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[11] => Array
(
[Dish_ID] => 69
[Dish_Name] => Dhokla(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[12] => Array
(
[Dish_ID] => 88
[Dish_Name] => Veg poha (Plate-gm)
[Diet_Type] => Suggested
[Quantity] => 1
)
[13] => Array
(
[Dish_ID] => 76
[Dish_Name] => Fruit salad(-BOWL)
[Diet_Type] => Suggested
[Quantity] => 1
)
[14] => Array
(
[Dish_ID] => 43
[Dish_Name] => Apple(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[15] => Array
(
[Dish_ID] => 44
[Dish_Name] => Orange(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[16] => Array
(
[Dish_ID] => 45
[Dish_Name] => Papaya(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[17] => Array
(
[Dish_ID] => 46
[Dish_Name] => Guava(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[18] => Array
(
[Dish_ID] => 50
[Dish_Name] => Pear(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[19] => Array
(
[Dish_ID] => 62
[Dish_Name] => Kakadi(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[20] => Array
(
[Dish_ID] => 63
[Dish_Name] => Cucumber(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[21] => Array
(
[Dish_ID] => 64
[Dish_Name] => Mausami(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[22] => Array
(
[Dish_ID] => 65
[Dish_Name] => Grapes(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[23] => Array
(
[Dish_ID] => 66
[Dish_Name] => Malta(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[24] => Array
(
[Dish_ID] => 81
[Dish_Name] => Black grapes(Bowl-gm)
[Diet_Type] => Suggested
[Quantity] => 1
)
[25] => Array
(
[Dish_ID] => 80
[Dish_Name] => Falsa(-BOWL)
[Diet_Type] => Suggested
[Quantity] => 1
)
[26] => Array
(
[Dish_ID] => 82
[Dish_Name] => Kiwis(-PCS)
[Diet_Type] => Suggested
[Quantity] => 1
)
[27] => Array
(
[Dish_ID] => 40
[Dish_Name] => Anwla juice(Glass-ml)
[Diet_Type] => Focus
[Quantity] => 1
)
[28] => Array
(
[Dish_ID] => 42
[Dish_Name] => Aloevera juice(Glass-ml)
[Diet_Type] => Focus
[Quantity] => 1
)
[29] => Array
(
[Dish_ID] => 100
[Dish_Name] => Methi Kadha(Cup-ml)
[Diet_Type] => Focus
[Quantity] => 1
)
[30] => Array
(
[Dish_ID] => 7
[Dish_Name] => Sprout(-Bowl)
[Diet_Type] => Focus
[Quantity] => 1
)
[31] => Array
(
[Dish_ID] => 2
[Dish_Name] => Tea(-cup)
[Diet_Type] => Restricted
[Quantity] => 0
)
[32] => Array
(
[Dish_ID] => 1
[Dish_Name] => Biscuit(Plate-Piece)
[Diet_Type] => Restricted
[Quantity] => 0
)
[33] => Array
(
[Dish_ID] => 3
[Dish_Name] => Bread(Plate-Piece)
[Diet_Type] => Restricted
[Quantity] => 0
)
[34] => Array
(
[Dish_ID] => 120
[Dish_Name] => BUTTER(Spoon-gm)
[Diet_Type] => Restricted
[Quantity] => 0
)
[35] => Array
(
[Dish_ID] => 121
[Dish_Name] => JAM(Spoon-gm)
[Diet_Type] => Restricted
[Quantity] => 0
)
[36] => Array
(
[Dish_ID] => 122
[Dish_Name] => Coffee(Cup-ml)
[Diet_Type] => Restricted
[Quantity] => 0
)
[37] => Array
(
[Dish_ID] => 211
[Dish_Name] => Fast Food(Plate-Piece)
[Diet_Type] => Restricted
[Quantity] => 0
)
[38] => Array
(
[Dish_ID] => 156
[Dish_Name] => Packed Juices (Glass-ml)
[Diet_Type] => Restricted
[Quantity] => 0
)
[39] => Array
(
[Dish_ID] => 160
[Dish_Name] => Oily Foods(Plate-gm)
[Diet_Type] => Restricted
[Quantity] => 0
)
[40] => Array
(
[Dish_ID] => 159
[Dish_Name] => Refined Flour(Plate-gm)
[Diet_Type] => Restricted
[Quantity] => 0
)
[41] => Array
(
[Dish_ID] => 162
[Dish_Name] => Sweets(Plate-Piece)
[Diet_Type] => Restricted
[Quantity] => 0
)
[42] => Array
(
[Dish_ID] => 155
[Dish_Name] => Beverages(Plate-Piece)
[Diet_Type] => Restricted
[Quantity] => 0
)
[43] => Array
(
[Dish_ID] => 157
[Dish_Name] => Spreaders (Plate-gm)
[Diet_Type] => Restricted
[Quantity] => 0
)
[44] => Array
(
[time] => 09:30 AM
)
)
并希望从我们所有的阵列中过滤所有建议的饮食
$breakfast_suggested = array_filter($breakfast,function($k){
return $k['Diet_Type'] == "Suggested";
});
这次我遇到错误
A PHP Error was encountered
Severity: Notice
Message: Undefined index: Diet_Type
在打印$ breakfast_时，建议此打印正常
Array
(
[0] => Array
(
[Dish_ID] => 99
[Dish_Name] => Luke Warm Water (Glass-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[1] => Array
(
[Dish_ID] => 40
[Dish_Name] => Anwla juice(Glass-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[2] => Array
(
[Dish_ID] => 42
[Dish_Name] => Aloevera juice(Glass-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[3] => Array
(
[Dish_ID] => 100
[Dish_Name] => Methi Kadha(Cup-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[4] => Array
(
[Dish_ID] => 147
[Dish_Name] => Herbal Tea(Cup-ml)
[Diet_Type] => Suggested
[Quantity] => 1
)
[5] => Array
(
[Dish_ID] => 7
[Dish_Name] => Sprout(-Bowl)
[Diet_Type] => Suggested
[Quantity] => 1
)
[6] => Array
(
[Dish_ID] => 8
[Dish_Name] => Steam sprout(-bowl)
[Diet_Type] => Suggested
[Quantity] => 1
)
[7] => Array
(
[Dish_ID] => 22
[Dish_Name] => Upma(-bowl)
[Diet_Type] => Suggested
[Quantity] => 1
)
[8] => Array
(
[Dish_ID] => 21
[Dish_Name] => Uttapam(-Pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[9] => Array
(
[Dish_ID] => 71
[Dish_Name] => Veg chilla(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[10] => Array
(
[Dish_ID] => 73
[Dish_Name] => Suji chilla(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[11] => Array
(
[Dish_ID] => 69
[Dish_Name] => Dhokla(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[12] => Array
(
[Dish_ID] => 88
[Dish_Name] => Veg poha (Plate-gm)
[Diet_Type] => Suggested
[Quantity] => 1
)
[13] => Array
(
[Dish_ID] => 76
[Dish_Name] => Fruit salad(-BOWL)
[Diet_Type] => Suggested
[Quantity] => 1
)
[14] => Array
(
[Dish_ID] => 43
[Dish_Name] => Apple(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[15] => Array
(
[Dish_ID] => 44
[Dish_Name] => Orange(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[16] => Array
(
[Dish_ID] => 45
[Dish_Name] => Papaya(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[17] => Array
(
[Dish_ID] => 46
[Dish_Name] => Guava(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[18] => Array
(
[Dish_ID] => 50
[Dish_Name] => Pear(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[19] => Array
(
[Dish_ID] => 62
[Dish_Name] => Kakadi(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[20] => Array
(
[Dish_ID] => 63
[Dish_Name] => Cucumber(Plate-Piece)
[Diet_Type] => Suggested
[Quantity] => 1
)
[21] => Array
(
[Dish_ID] => 64
[Dish_Name] => Mausami(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[22] => Array
(
[Dish_ID] => 65
[Dish_Name] => Grapes(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[23] => Array
(
[Dish_ID] => 66
[Dish_Name] => Malta(-pcs.)
[Diet_Type] => Suggested
[Quantity] => 1
)
[24] => Array
(
[Dish_ID] => 81
[Dish_Name] => Black grapes(Bowl-gm)
[Diet_Type] => Suggested
[Quantity] => 1
)
[25] => Array
(
[Dish_ID] => 80
[Dish_Name] => Falsa(-BOWL)
[Diet_Type] => Suggested
[Quantity] => 1
)
[26] => Array
(
[Dish_ID] => 82
[Dish_Name] => Kiwis(-PCS)
[Diet_Type] => Suggested
[Quantity] => 1
)
)
所以我不明白这里发生了什么