使用MySQL数据构建JSON多维数组

Question

I'm trying to build a multidimensional array in JSON using data from MySQL. I need my JSON to looks like this:

[
    {
        "name": "test name",
        "dates": {
            "Feb 26 2019": 2,
            "Feb 27 2019": 5,
            "Feb 28 2019": 8
        }
    },
        {
        "name": "test name 2",
        "dates": {
            "Feb 22 2019": 2,
            "Feb 24 2019": 5,
            "Feb 28 2019": 8
        }
    }
]

The dates are how many times the name appears in the MySQL table. For example, "test name" shows up 2 times with the date of "Feb 26 2019".

Here is my php:

$query = $wpdb->get_results( "SELECT date, count(date) AS `count` FROM $table_name group by date" );
foreach ($query as $row) {
    $valid_date = date( 'M d Y', strtotime($row->date));
    $data[] = array('date' => $valid_date, 'count' => $row->count);
}


$query1 = $wpdb->get_results( "SELECT DISTINCT cuname FROM $table_name ORDER BY cuname" );
foreach ($query1 as $row) {
    $names[] = array('name' => $row->cuname, 'date' => $data);
}

print json_encode($names);

Here is the JSON that is getting returned:

[  
    {  
        "name":"test name",
        "date":[  
            {  
                "date":"Feb 22 2019",
                "count":"9"
            },
            {  
                "date":"Feb 23 2019",
                "count":"14"
            },
            {  
                "date":"Feb 24 2019",
                "count":"9"
            },
            {  
                "date":"Feb 25 2019",
                "count":"7"
            },
            {  
                "date":"Feb 26 2019",
                "count":"1"
            }
        ]
    },
    {  
        "name":"test name 2",
        "date":[  
            {  
                "date":"Feb 22 2019",
                "count":"9"
            },
            {  
                "date":"Feb 23 2019",
                "count":"14"
            },
            {  
                "date":"Feb 24 2019",
                "count":"9"
            },
            {  
                "date":"Feb 25 2019",
                "count":"7"
            },
            {  
                "date":"Feb 26 2019",
                "count":"1"
            }
        ]
    }
]

The issue is that all dates and the number of times the dates appear in the table are showing up for each "name". I only need the dates for how many times each name appears.

Answer 1

I'd do it with a single query:

$sql = "
SELECT 
    `cuname` AS `name`, 
    `date`,
     count(`date`) as `datecount`
FROM 
    $table_name
GROUP BY 
    `name`, `date`
";


$query = $wpdb->get_results($sql);

$res = array();
$i = 0;
$name = null;
foreach ($query as $row) {
    if ($name!=$row->name && $name != null) {
        $i++;
    }
    $res[$i][$row->name] = $row->name;
    $res[$i]['dates'][$row->date] = $row->datecount;

    $name = $row->name;
}

//Verify the array structure:

echo "<pre>";
print_r($res);
echo "</pre>";

//Build JSON:
$json = json_encode($res);