尝试在 php 中使用 json_encode() 以 json 格式获取输出

Question

我正在尝试将输出设为：

{
   "1":{
      "word":"Apple",
      "definition":"This is a Fruit"
   },
   "2":{
      "word":"Grapes",
      "definition":"This is a Fruit too"
   },
   .
   . //so on
   .

}

我的php7源代码(ma​​in.php)是：

<?php
require 'configure.php';

$query = "SELECT * from entries where word LIKE 'Z%'";
$result = $conn->query($query);
$row = $result->fetch_array(MYSQLI_ASSOC);

$marks = array();

while ($row = $result->fetch_array()) {
    $marks[] =  array($row['sN'] => array(
        "word" => $row['word'],
        "definition" => $row['definition']
    ));     
}

var_dump(json_encode($marks));//(json_encode($marks));

/* free result set */
$result->free();

mysqli_close($conn);
?>

下面给出的代码生成我想要的输出：

$marks = array(
"mohammad" => array
(
"physics" => 35,
"maths" => 30,
"chemistry" => 39
),
"qadir" => array
(
"physics" => 30,
"maths" => 32,
"chemistry" => 29
),
"zara" => array
(
"physics" => 31,
"maths" => 22,
"chemistry" => 39
)
);
echo json_encode($marks);

我正在尝试在我的 ma​​in.php 中应用关联数组的概念 如何在上面的 ma​​in.php 中使用 LOOP 获得所需的 json 输出？

Answer 1

尝试使用JSON_FORCE_OBJECT 作为json_encode() 函数的参数一次。像这样..

echo json_encode($marks,JSON_FORCE_OBJECT);

JSON_FORCE_OBJECT：使用非关联数组时输出对象而不是数组。当输出的接收者期待一个对象并且数组为空时尤其有用。

Answer 2

我认为问题在于您如何分配 $marks 数组

while ($row = $result->fetch_array()) {
    $marks[$row['sN']] = array(
        "word" => $row['word'],
        "definition" => $row['definition']
    );     
}

你可以得到 0 个索引数组

$index = 0;
while ($row = $result->fetch_array()) {
    $marks[$index] = array(
        "word" => $row['word'],
        "definition" => $row['definition']
    );
    $index++;
}