Php 将平面json转换为类似json的树视图

echo

产生：

            while($row = mysqli_fetch_assoc($result)) { 
              echo (json_encode($row));  
            }   

我要找的是：

            {"name":"REPORTING","parent":"null","children":"BO"}{"name":"IHS","parent":"BO","children":"1"}{"name":"TOMCAT","parent":"BO","children":"1"}{"name":"WAS","parent":"BO","children":"1"}{"name":"BO","parent":"BO","children":"1"}{"name":"1","parent":"IHS","children":"APP NAME"}{"name":"1","parent":"TOMCAT","children":"APP NAME"}{"name":"1","parent":"WAS","children":"APP NAME"}{"name":"1","parent":"BO","children":"APP NAME"}       

---

您不能将行转储到

json\u encode

echo中，因为您的数据的结构与所需结果中的json不同。您必须编写基于父/子值构造树的代码。我建议您使用所需的字段创建一个类，并在循环中填充数据

一个简单的示例（不是完成的代码，只是为了让您对该方法有一些了解）：

MyClass.php：

require_once ('MyClass.php')
$data = new MyClass();
while($row = mysqli_fetch_assoc($result)) {
    if($row['parent'] == 'null') {
        $data->parse($row);
    } else {
        $child = $data->findChild($row['parent']);
        if($child !== false) {
            $child->parseChild($row);
        }
    }
}
echo json_encode($data);

---

这段代码有缺陷和bug，比如父母必须先于孩子。在您的示例中，

echo

IHS出现在BO之前，因此没有这样的父对象，无法创建子对象。您需要对数据进行正确排序，才能使此代码正常工作。

之前，我还必须使用平面数据结构来完成此操作。我用PHP中的处理器密集型递归函数解决了这个问题

例如（注释代码未测试）

PHP:

---

到底是什么问题？你不能使用

JSON_PRETTY_PRINT

，因为你的PHP版本太旧了？我想要你在“我要找的是：”中看到的代码，作为输出，我使用d3js@ÁlvaroG.Vicario

JSON_PRETTY_PRINT

是不够的，因为行之间没有子/父关系，其实我对php和d3js还不太熟悉，请检查小提琴。请提供一些链接，以便我可以写所需的代码

require_once ('MyClass.php')
$data = new MyClass();
while($row = mysqli_fetch_assoc($result)) {
    if($row['parent'] == 'null') {
        $data->parse($row);
    } else {
        $child = $data->findChild($row['parent']);
        if($child !== false) {
            $child->parseChild($row);
        }
    }
}
echo json_encode($data);

class MyClass {
    public $name;
    public $parent;
    public $children;

    public function __construct($name = "") {
        $this->name = $name;
        $this->parent = "null";
        $this->children = array();
    }

    public function parse($rowdata) {
        $this->name = $rowdata['name'];
        $this->parent = $rowdata['parent'];
        echo "Created object " . $this->name . "\n";
    }

    public function parseChild($rowdata) {
        $child = new MyClass();
        $child->parse($rowdata);
        $this->children[] = $child;
    }

    public function findChild($name) {
        if($this->name == $name) {
            return $this;
        } else {
            foreach($this->children as $child) {
                if($child->name == $name) {
                    return $child;
                } else {
                    $ch = $child->findChild($name);
                    if($ch !== false) {
                        return $ch;
                    }
                }
            }
        }
        return false;
    }
}

// MySQL connection defined elsewhere as $con and assuming your table is called Categories
function getCategories($name = null) {
    if(is_null($name)){
        //get all top-level parents
        $sqlString = "SELECT * FROM Categories WHERE parent IS NULL";
    } else {
        $sqlString = "SELECT * FROM Categories WHERE parent = '$name'";
    }

    // Initialise empty categories array;
    $allCats = array();

    $result = mysqli_query($con, $sqlString);

    while ($row = mysqli_fetch_array($result)) {

        $cat['name'] = $row['name'];
        $cat['parent'] = $row['parent'];

        // Fetch any children it may have
        $childCats = getCategories($row['name']);
        if (count($childCats) > 0) {
            $childCat['children'] = $childCats;
        }

        $cat['children'][] = $childCat;
        $allCats['children'][] = $cat;
    }

    return $allCats;
}

$allCats['name'] = "All Categories";
$allCats['parent'] = null;
$allCats['children'] = getCategories();

echo json_encode($allCats);