Question

我即将从MySQL查询中正确获取此JSON，但遇到了一些困难。

$results = [];

foreach ($getbill as $row) {
    $category = $district;
    $building = $row['building'];

    if (!isset($results[$category])) 
    {$results[$building] = ['category' => $building, 'values' => []];    }
        $results[$category] = ['category' => $building, 'values' => []];    
            $results[$row['building']]['students'][] = ['lastname' => $row['slast'], 'firstname' => $row['sfirst'], 'ens' => $row['selected'], 'part' => $row['instname'], 'division' => $row['sdiv'], 'festival' => $row['sfest']];
            }

echo json_encode(array_values($results));

上面的代码导出：

[{"category":"Belmont Elementary School","values":[],"students":[{"lastname":"jones","firstname":"melissa","ens":"C","part":"Childrens Voice","division":"1","festival":"w"},{"lastname":"smith","firstname":"melissa","ens":"C","part":"Childrens Voice","division":"1","festival":"w"},{"lastname":"b","firstname":"b","ens":"C","part":"Childrens Voice","division":"1","festival":"w"},{"lastname":"b","firstname":"b","ens":"C","part":"Childrens Voice","division":"1","festival":"w"},{"lastname":"chocolate","firstname":"Charlie","ens":"C","part":"Childrens Voice","division":"1","festival":"w"},{"lastname":"Shmow","firstname":"Joe","ens":"C","part":"Childrens Voice","division":"1","festival":"w"},{"lastname":"abrams","firstname":"Alysond","ens":"C","part":"Childrens Voice","division":"1","festival":"w"}]},{"category":"Parliament Place","values":[]},{"students":[{"lastname":"Jones","firstname":"Joe","ens":"B","part":"Trombone","division":"1","festival":"w"},{"lastname":"Smith","firstname":"Ally","ens":"B","part":"Alto Sax","division":"1","festival":"w"}]}]

它是按学校分组的，但是，学校必须在学生信息之前的开头列出。成品需要如下，但我很茫然...

{"length":8,"schools":[{"name":"Test High School","students":[{"lastname":"Smith","firstname":"Allison","ens":"Band","part":"Bb Clarinet","division":"III","festival":"West"},{"lastname":"Jones","firstname":"Derek","ens":"Band","part":"Tuba/Sousaphone","division":"III","festival":"West"},{"lastname":"Johnson","firstname":"Matthew","ens":"Band","part":"Timpani","division":"III","festival":"West"},{"lastname":"Hughley","firstname":"Elizabeth","ens":"Band","part":"French Horn","division":"II","festival":"West"}]},{"name":"Test Elementary School","students":[{"lastname":"Jones","firstname":"Emmett","ens":"Band","part":"Bb Clarinet","division":"I","festival":"West"},{"lastname":"Aaren","firstname":"Owen","ens":"Band","part":"Tuba/Sousaphone","division":"I","festival":"West"},{"lastname":"Johns","firstname":"Sonia","ens":"Band","part":"French Horn","division":"I","festival":"West"},{"lastname":"Williams","firstname":"Nathaniel","ens":"Band","part":"Bb Clarinet","division":"I","festival":"West"}]}],"bill":120}

我假设我可以使用PHP变量通过对查询的记录进行计数并乘以15来使“ Length”和“ Bill”部分正确，但是..我如何压缩所有正确的JSON用PHP创建代码？

已更新：以下原始数据

更新2：我知道了。 @Raymond的原始评论使我朝着正确的方向前进。谢谢。我必须摆脱查询的一行，并且必须手动“回显”开始和结束（长度和成本）。工作正常！谢谢大家的帮助。

foreach ($getbill as $row) {
    if (!isset($results[$building])) {
        $results[$building] = ['name' => $row['building']];  
        }
        $results[$row['building']]['students'][] = ['lastname' => $row['slast'], 'firstname' => $row['sfirst'], 'ens' => $ens, 'part' => $row['instname'], 'division' => $age, 'festival' => $loc];
}

Answer 1

此代码示例对您有帮助吗？

PHP对象将转换为{}部分的JSON对象。
PHP数组将转换为JSON数组，而该数组不在[]部分。

PHP代码

<?php

$StdClass = new StdClass();
$StdClass->length = 10;
$StdClass->schools = array_values(array(1, 2));

var_dump(json_encode($StdClass));

?>

结果

string(29) "{"length":10,"schools":[1,2]}"

已编辑，因为未注释：

感谢您的快速回复，但很遗憾，我真的很难受时间弄清楚了。还有，所有这些“字符” 算不上我。

是的，为学校和学生获取[{..}] JSON格式比较棘手。
我建议您编写自定义类，并使用JsonSerializable将自定义对象转换为JSON

PHP 7代码

<?php

class school implements JsonSerializable {
  private $name = null;
  private $students = array();

  private function __construct() {

  }

  public function __destruct() {
      $this->name = null;
      $this->students = null;
  }  

  // Use a static object because it will enable method chaining
  public static function getInstance() {
      return new school();
  }

  public function setName(string $name) : school { 
      $this->name = $name;
      return $this; // needed to chain
  }

  public function setStudent(Student $student) : school { 
      $this->students[] = $student;
      return $this; // needed to chain
  }  

  public function getName() : ?string {
      return $this->name;
  }

  public function getStudents() : ?array {
      return $this->students;
  }  

  public function __get($name) : mixed {
      return $this->name;
  }

  public function jsonSerialize() {
    return array(
        "name" => $this->name
      , "students" => $this->students
    );
  }  
}

class student implements JsonSerializable {
  private $lastname = null; 
  private $firstname = null;

  private function __construct() {

  }

  public function __destruct() {
      $this->lastname = null;
      $this->firstname = null;
  }

  // Use a static object because it will enable method chaining
  public static function getInstance() {
      return new student();
  }  

  public function setLastName(string $lastname) : student { 
      $this->lastname = $lastname;
      return $this; // needed to chain
  }  

  public function setFirstName(string $firstname) : student { 
      $this->firstname = $firstname;
      return $this; // needed to chain
  } 

  public function getFirstName() : ?string {
      return $this->firstname;
  }

  public function getLastName() : ?string {
      return $this->lastname;
  }  

  public function jsonSerialize() {
    return array(
        "lastname" => $this->lastname
      , "firstname" => $this->firstname
    );  
  }
}

$json = new stdClass();
$json->length = 10;


$json->schools = array(
    school::getInstance()
          ->setName('Test High School')
          ->setStudent(
              student::getInstance()
                     ->setFirstname('Smith') 
                     ->setLastname('Allison')
          )
          ->setStudent(
              student::getInstance()
                     ->setFirstname('Jones') 
                     ->setLastname('Derek')
          )          
    , 
    school::getInstance()
          ->setName('Test Elementary School')    
          ->setStudent(
              student::getInstance()
                     ->setFirstname('Jones') 
                     ->setLastname('Emmett')  
         ) 
);

var_dump(json_encode($json));

?>

p.s 要使代码在较低的PHP版本上运行，请删除PHP的return type declarations

采用这种JSON格式的结果

{
    "length": 10,
    "schools": [{
        "name": "Test High School",
        "students": [{
            "lastname": "Allison",
            "firstname": "Smith"
        }, {
            "lastname": "Derek",
            "firstname": "Jones"
        }]
    }, {
        "name": "Test Elementary School",
        "students": [{
            "lastname": "Emmett",
            "firstname": "Jones"
        }]
    }]
}

Answer 2

为了使您的生活更轻松，我建议您像

$students_array = []; 
array_push($students_array, ["key"=>"data"]);

要获取与您想要的数组相似的数组，请查看下面的结构。以此类推，对于嵌套的嵌套，我认为这会有所帮助，不要犹豫，问！

json_encode(
                [
                    "length"=>/*sizeof($some_array)*/ 2,
                    "schools" =>
                    [
                        "name" => 'test highscool',
                        "students" => [
                            [
                                "lastname" => "Smith",
                                "firstname" => "Allison",
                                "ens" => "Band",
                                "part" => "Bb Clarinet",
                                "division" => "III",
                                "festival" => "West"],
                            [
                                "lastname" => "Jones",
                                "firstname" => "Derek",
                                "ens" => "Band",
                                "part" => "Tuba/Sousaphone",
                                "division" => "III",
                                "festival" => "West"
                            ]
                        ]
                    ],
                    [
                        "name" => 'test highscool_2',
                        "students" => [
                            [
                                "lastname" => "Smith 2",
                                "firstname" => "Allison 2",
                                "ens" => "Band 2",
                                "part" => "Bb Clarinet 2",
                                "division" => "III 2",
                                "festival" => "West 2"]
                        ]
                    ]
                ]
            );

PHP中嵌套JSON的问题

2 个答案: