在 Windows 10 上找不到 PHP 5.6.8 JsonSerialized 接口(interface)

Question

我正在尝试在下面的类上实现 JsonSerialized 接口(interface):

class PostoGraduacao implements JsonSerializable
 {
    private $index;
    private $abbreviation;
    private $rank;

    public function __construct($index, $abbreviation, $rank){
        $this->index = $index;
        $this->abbreviation = $abbreviation;
        $this->rank = $rank;
    }

    public function jsonSerialize()
    {
        return[
            'index' => $this->index,
            'abbreviation' => $this->abbreviation,
            'rank' => $this->rank
        ];
    }
}

我的 PHP 版本:

C:\>php -v
PHP 5.6.8 (cli) (built: Apr 15 2015 15:07:09)
Copyright (c) 1997-2015 The PHP Group

错误:

 Fatal error: Interface 'PostoGraduacao\Model\JsonSerializable' not found inC:\Projetos\RESTServices\src\PostoGraduacao\model\PostoGraduacao.php on line 11

Answer 1

你需要做:

class PostoGraduacao implements \JsonSerializable

从错误消息中可以看到PHP正在寻找:

PostoGraduacao\Model\JsonSerializable

这是因为您的类位于 PostoGraduacao\Model 命名空间内。使用 \JsonSerialized 告诉 PHP 在全局命名空间中查找。