如何在PHP中从MySQL创建自定义JSON布局 - How to create a custom JSON layout from MySQL in PHP

我有一个MySQL查询在PHP中拉回两列的结果

第一列是Label第二列是Value

我读过http://nitschinger.at/Handling-JSON-like-a-boss-in-PHP，但我很难理解我如何能做以下JSON PHP从MySQL

[
  {
    key: "Cumulative Return",
    values: [
      { 
        "label": "One",
        "value" : 29.765957771107
      } , 
      { 
        "label": "Two",
        "value" : 0
      } , 
      { 
        "label": "Three",
        "value" : 32.807804682612
      } , 
      { 
        "label": "Four",
        "value" : 196.45946739256
      } , 
      { 
        "label": "Five",
        "value" : 0.19434030906893
      } , 
      { 
        "label": "Six",
        "value" : 98.079782601442
      } , 
      { 
        "label": "Seven",
        "value" : 13.925743130903
      } , 
      { 
        "label": "Eight",
        "value" : 5.1387322875705
      }
    ]
  }
]

我可以像上面那样手动编写一个循环来输出原始文本以形成JSON，但我真的想使用json_encode

<?php
$hostname = 'localhost'; //MySQL database
$username = 'root'; //MySQL user
$password = ''; //MySQL Password
try {
    $dbh = new PDO("mysql:host=$hostname;dbname=etl", $username, $password);
    $query = "select label, value from table";
    $stmt = $dbh->prepare($query);
    $stmt->execute();
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);
    if (!empty($result)) {
        echo '[
        {
          key: "Cumulative Return",
          values: [';
        for ($row = 0; $row < count($result); $row++) {
            echo "{";
            echo '"label": "' . $result[$row]['Label'] . '",';
            echo '"Value": ' . $result[$row]['Value'];
            echo "},";
            echo '       ]
      }
    ]';
        }
    }
}
catch (PDOException $e) {
    echo $e->getMessage();
}
?>

这能做到吗?如果有，那是怎么回事?

使用json_encode()

$jsonArr = array( 'key' => 'Cumulative Return' , 'values' => array() );

foreach ($result as $res) 
{
   $jsonArr['values'][] = array('label'=>$res['Label'],'value'=>$res['value']);
}
echo json_encode($jsonArr);

试试这个:

$hostname = 'localhost'; //MySQL database
$username = 'root'; //MySQL user
$password = ''; //MySQL Password
try {
    $dbh = new PDO("mysql:host=$hostname;dbname=etl", $username, $password);
    $query = "select label, value from table";
    $stmt = $dbh->prepare($query);
    $stmt->execute();
    $result = $stmt->fetchAll(PDO::FETCH_ASSOC);
    $values = array();
    for($row = 0; $row < count($result); $row++)
    {
        $values[] = array('label' => $result[$row]['Label'], 'value' => $result[$row]['Value']);
    }
    $to_encode = array(
                        array('key' => 'Cumulative Return', 
                              'values' => $values;
                              )
                        );
    echo json_encode($to_encode);
} catch (PDOException $e) {
    echo $e->getMessage();
}

你只需要按照你想要转换为json的方式创建数组:

$encode = array(
    'key' => 'Cumulative Return', 
    'values' => $result->fetchAll(PDO::FETCH_ASSOC)
);
echo json_encode($encode);

这就是JSON的有用之处-您不需要手动编码它。

$json = array();
$results = array();
$json['key'] = 'Cumulative return';
foreach ($row as $entry) {
    $results['label'] = $entry['Label'];
    $results['value'] = $entry['Value'];
    $json['value'][] = $results;
}
echo json_encode($json);

就是这样。享受吧!

我使用代码点火器

这是我如何从数据库的值创建自定义json希望它有助于

function getData() {
		$query = $this -> db -> get('gcm_users');
		
		$result_array=array();
		if ($query -> num_rows() > 0) {
			
			$results=$query->result();
			foreach ( $results as $row) {
				
				$data=array();
				
				$data['name']=$row->name;
				$data['email']=$row->email;
				
				array_push($result_array,$data)	;		
			}
			
			return json_encode($result_array);
		} else {
			echo "something went wrong";
		}
	}

这是我从数据库中检索数据的功能，因为我使用框架工作，如代码点燃器，我不必担心我的其他sql操作，希望你可以从这个代码中提取你需要的东西。

输出如下所示

[{"name":"allu","email":"allu@gmail.com"},{"name":"ameeen","email":"cdfdfd@gmail.com"}]

我构建了一个简单的函数(我更喜欢使用它而不是json_encode -因为我可以完全控制所获取的数据):

    public function mysqlToJoson($mysqlarray)
    {
        $json_string = "[";
        while ($array = $mysqlarray->fetch()) {
            $i = 1;
            if ($json_string != "["){$json_string .= ",";}
            foreach ($array as $key => $value) {
                if ($i == 1) {
                    $json_string .= '{"' . $key . '":' . '"' . htmlentities($value,ENT_QUOTES, 'UTF-8') . '"';
                } else $json_string .= ',"' . $key . '":' . '"' . htmlentities($value,ENT_QUOTES, 'UTF-8') . '"';
                $i++;
            }
            $json_string .= '}';
        }
        $json_string .= ']';
        return $json_string;
    }