使用php构建json响应

Question

我试图处理具有复杂结构的JSON响应，并且我不知道如何在多次尝试后对其进行管理。

JSON响应必须是这样的：

"note": { 
     "vote": 3, 
     "items":[ 
     { 
      "value": 1, 
      "touchArea": { 
       "x": 122, 
       "y": 173, 
       "w": 89, 
       "h": 89 
      } 
     }, 
     { 
      "value": 2, 
      "touchArea": { 
       "x": 122, 
       "y": 283, 
       "w": 89, 
       "h": 89 
      } 
     }, 
     { 
      "value": 3, 
      "touchArea": { 
       "x": 122, 
       "y": 390, 
       "w": 89, 
       "h": 89 
      } 
     } 
     ] 

注：“投票”是阵列

As源的最大值，我要求MYSQL和我得到这个阵列（$触摸） ：

Array ([0] => V:1,X:122,Y:173,W:89,H:89 [1] => V:2,X:122,Y:283,W:89,H:89 [2] => V:3,X:122,Y:390,W:89,H:89) 

我的问题是：如何从PHP生成这个带有循环的JSON响应，在这个例子中我们只有3个值，但它可能更多。

Answer 1

您可以使用以下命令编辑并重新保存json文件或字符串中的数据。

<?php 
    $sInFile = 'in2.json'; 
    $sOutFile = 'out2.json'; 

    $aDevelopers = array(); 
    $aArtists = array(); 
    $aCooks  = array(); 

    $sRaw  = file_get_contents($sInFile); 
    var_dump($sRaw); 
    // object 
    $oData = json_decode($sRaw); 
    //array 
    $aData = json_decode($sRaw, 1); 
    $aNote = $aData[ 'note' ]; 
    $aItems = $aNote[ 'items' ]; 
var_dump($aData); 
    $iCountData = count($aItems); 
    // Loops through items and set new values. 
    for($i = 0; $i < $iCountData; ++$i) 
    { 
     $aItem = $aItems[ $i ]; 
     $aItem[ 'value' ] = 'newvalue'; 
     $aItem[ 'touchArea' ][ 'x' ] = 3455; 
     $aItem[ 'touchArea' ][ 'y' ] = 43; 
     $aItems[ $i ] = $aItem; 
    } 
    $aNote[ 'items' ] = $aItems; 
    $aData[ 'note' ] = $aNote; 
var_dump($aData); 
    $sNewJson = json_encode($aData); 

    file_put_contents($sOutFile, $sNewJson); 
?> 

Answer 2

假设你的结果从MySQL设置为一个字符串数组，如你的问题暗示，你需要遍历这个结果集，分割字符串上,，然后:，按摩前数据转换成你想要的结构，然后再转换成json。

下面应该为你的工作给你提供的信息：

<?php 

// your initial result set from mysql - an array of strings 

$touch = [ 
    'V:1,X:122,Y:173,W:89,H:89', 
    'V:2,X:122,Y:283,W:89,H:89', 
    'V:3,X:122,Y:390,W:89,H:89', 
]; 

// map over each element in your result set... 

$items = array_map(function($item) { 

    $array = []; 

    // first, break each string on `,` to 
    // get an array of elements; e.g: 
    // ['V:1', 'X:122', 'Y:173', 'W:89', 'H:89'] etc. 

    $itemElements = explode(',', $item); 

    // then, iterate over these elements... 

    foreach ($itemElements as $itemElement) { 
     // explode on `:` and assign as a key value pair 
     list($key, $value) = explode(':', $itemElement); 
     // then, check the key and add the 
     // value to the array as appropriate 
     if ('V' === $key) { 
      $array['value'] = $value; 
     } else { 
      $array['touchArea'][strtolower($key)] = $value; 
     } 
    } 

    return $array; 

}, $touch); 

// then, build the `$note` array... 

$note = [ 
    'note' => [ 
     'vote' => count($items), 
     'items' => $items, 
    ] 
]; 

// finally, json encode 

echo json_encode($note, JSON_PRETTY_PRINT); 

这产生了：

{ 
    "note": { 
     "vote": 3, 
     "items": [ 
      { 
       "value": "1", 
       "touchArea": { 
        "x": "122", 
        "y": "173", 
        "w": "89", 
        "h": "89" 
       } 
      }, 
      { 
       "value": "2", 
       "touchArea": { 
        "x": "122", 
        "y": "283", 
        "w": "89", 
        "h": "89" 
       } 
      }, 
      { 
       "value": "3", 
       "touchArea": { 
        "x": "122", 
        "y": "390", 
        "w": "89", 
        "h": "89" 
       } 
      } 
     ] 
    } 
} 

希望这有助于:)

Answer 3

解决方案与array_map，explode，array_column和max功能：

$touch = ["V:1,X:122,Y:173,W:89,H:89", "V:2,X:122,Y:283,W:89,H:89", "V:3,X:122,Y:390,W:89,H:89"]; 

$result_arr = ["note" => ["vote" => 0, "items" => []]]; // basic structure 

array_map(function($v) use (&$result_arr){ 
    $arr = explode(",", $v); 
    $result = []; 
    foreach ($arr as $value) { 
     $new_arr = explode(":", $value); 
     $key = strtolower($new_arr[0]); 
     if ($key == "v"){ 
      $result["value"] = $new_arr[1]; 
     } else { 
      $result["touchArea"][$key] = $new_arr[1]; 
     } 
    } 
    $result_arr["note"]["items"][] = $result; 
}, $touch); 

// getting max vote 
$result_arr["note"]["vote"] = max(array_column($result_arr["note"]["items"], "value")); 

$final_json = json_encode($result_arr, JSON_PRETTY_PRINT);