protected function renderJSON($data=[], $msg ="ok", $code = 200)
{
    //設(shè)置格式
    header('Content-type: application/json');
    //輸出json格式的內(nèi)容
    print_r(json_encode([
      "code" => $code,
      "msg"  => $msg,
      "data" => $data,
      "req_id" => uniqid()
    ]));
    //結(jié)束
    return Yii::$app->end();
}

?php
// 告訴瀏覽器以json編碼
header('Content-type:text/json');
$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';
// 沒(méi)有設(shè)置則輸出對(duì)象
var_dump(json_decode($json));
echo "br>";
// 為true則為輸出數(shù)組
var_dump(json_decode($json, true));
echo "br>";
$array=array('a','f','q','d','a','g');
var_dump(json_encode($array,JSON_HEX_TAG));
?>

?php
// 告訴瀏覽器以json編碼
header('Content-type:text/json');
$json = '{"fruit":{{"apple":"蘋(píng)果"},{"banana":"蘋(píng)果"}}';
// string(49) "{"fruit":{{"apple":"蘋(píng)果"},{"banana":"蘋(píng)果"}}"
var_dump($json);