使用file_get_contents()发起post带参请求

public function sendPost()
    {
        $url = 'http://xxx.xxxx.com';
        $post_data = [
            'data1' => '',
            'data2' => '',
            'data3' =>''
        ];

        $options = array(
            'http' => array(
                'method'  => 'POST',
                // header 需要设置为 JSON
                'header'  => 'Content-type:application/json',
                'content' => json_encode($post_data,true),
                // 超时时间
                'timeout' => 60
            )
        );

        $context = stream_context_create( $options );
        $result = file_get_contents( $url, false, $context );
        return $result;//返回数据格式为json
    }