PHP 想要輸出 JSON [{0 -> xxx, north -> ooo}]，但是沒有物件(PHP: Objects)，想要直接指定值，再使用 json_encode() 產生 JSON，可以使用 stdClass(); 來達成。
註：stdClass: Anonymous Objects
PHP 建立物件來輸出 JSON 格式
PHP 使用 stdClass() 的使用範例
<?php
$r = new stdClass();
$r->{'0'} = '不分區';
$r->north = '北';
$r->east = '東';
$r->west = '西';
$r->middle = '中';
$r->south = '南';
$response = [$r];
echo json_encode($response);
// [{"0":"\u4e0d\u5206\u5340","north":"\u5317","east":"\u6771","west":"\u897f","middle":"\u4e2d","south":"\u5357"}]
?>
想要每個值都是不同陣列，作法如下：
<?php
$r1 = new stdClass();
$r2 = new stdClass();
$r3 = new stdClass();
$r4 = new stdClass();
$r5 = new stdClass();
$r6 = new stdClass();
$r7 = new stdClass();
$r1->{'0'} = '不分區';
$r2->north = '北';
$r3->east = '東';
$r4->west1 = '西';
$r5->middle = '中';
$r6->south = '南';
$response = [$r1, $r2, $r3, $r4, $r5, $r6];
echo json_encode($response);
// [{"0":"\u4e0d\u5206\u5340"},{"north":"\u5317"},{"east":"\u6771"},{"west1":"\u897f"},{"middle":"\u4e2d"},{"south":"\u5357"}]
?>
直接使用 stdClass 的屬性設定進去的方式 (不太建議)
<?php
$r = array(
0 => stdClass::__set_state(array(
'0' => '不分區',
'north' => '北',
),
1 => stdClass::__set_state(array(
'0' => '不分區',
'north' => '北',
)
);
?>
感謝 和風信使 提供的寫法：
<?php
if(!function_exists('encode_json')) {
function encode_json( $var ) {
static $options = null;
if (is_null($options)) {
$options = 0;
if (version_compare(PHP_VERSION, '5.3.3') >= 0)
$options |= JSON_NUMERIC_CHECK;
if (version_compare(PHP_VERSION, '5.4.0') >= 0)
$options |= JSON_UNESCAPED_SLASHES|JSON_UNESCAPED_UNICODE;
}
return json_encode($var, $options);
}
}
$response = [
[
'0' => '不分區',
'north' => '北',
'east' => '東',
'west' => '西',
'middle' => '中',
'south' => '南',
],
];
echo encode_json($response) . PHP_EOL;
?>
註：stdClass 是 PHP 內建 Object：PHP: Objects - Manual
<?php
$obj1 = new \stdClass; // Instantiate stdClass object
$obj2 = new class{}; // Instantiate anonymous class
$obj3 = (object)[]; // Cast empty array to object
var_dump($obj1); // object(stdClass)#1 (0) {}
var_dump($obj2); // object(class@anonymous)#2 (0) {}
var_dump($obj3); // object(stdClass)#3 (0) {}
echo json_encode([
new \stdClass,
new class{},
(object)[],
]);
// Outputs: [{},{},{}]
?>