file_get_contents()对指定网页或API实现get+post请求并传输获取数据

//GET请求方法
$url="https://www.baidu.com";
$ret=file_get_contents($url);
$list = json_decode($ret,1); //把json转为数组格式，视个人情况转换

//POST和GET通用请求方法
$url="https://www.baidu.com";
$data = ['username' => '***','password' => '***'];
$data = json_encode($data);
$opts = [
                 'http' => [
                                    'method' => 'POST',
                                    'header'  => 'Content-type:application/json',
                                    'content' => $data,
                           ]
        ];
$context = stream_context_create($opts);
$ret = file_get_contents($url,false,$context);