我正在尝试使用php从MySQL检索数据，但是我对php有点陌生。我有这样的桌子
distance height time
25 70 17:50:24
12 69 17:30:24
15 55 17:10:24
我希望保留这种格式的JSON：
{
"data": true,
"time":[
"17:50:24",
"17:30:24",
"17:10:24"
],
"distance":[
25,
12,
15
],
"height":[
70,
69,
55
]
}
我的PHP脚本是这样的：
<?php
$db = mysqli_connect("127.0.0.1", "root", "pw", "test1");
$row=$db->prepare('SELECT * FROM table');
$row->execute();
$json_data=array();
$json_latdata=array();
$result = array();
$result1 = array();
foreach($row as $rec)//foreach loop
{
$json_array['distance']=$rec['distance'];
$json_array['height']=$rec['height'];
$json_array['time']=$rec['time'];
array_push($json_data,$json_array);
array_push($json_latdata,$json_array1);
}
$result = $json_data;
$result1 = $json_latdata;
echo json_encode(array($result,$result1));
?>
但是输出是行格式（具有重复的标题），而不是我想要的JSON格式，并且其读数为null：
[[{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null},
{"distance":null,"height":null,"time":null}],
[null,null,null,null,null,null,null,null,null,null]]
非常感谢您抽出宝贵的时间！
您正在为每一行创建一个新对象，而不是将它们添加到每一列的数组中。
创建一个二维数组，其中每一列都有元素。然后，在处理查询结果时，将每一列推入适当的元素数组。
<?php
$db = mysqli_connect("127.0.0.1", "root", "pw", "test1");
$stmt = $db->prepare('SELECT distance, height, time FROM table');
$stmt->execute();
$rows = $stmt->get_result();
$result = ['data' => true, 'time' => [], 'distance' => [], 'height' => []];
foreach($rows as $rec)//foreach loop
{
foreach ($rec as $col => $value) {
$result[$col][] = $value;
}
}
echo json_encode($result);
?>
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