这算是file_put_content的高级用法了吧~

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$params     = array(
    'access_token'      => $access_token
);
$options            = array(
    'http' => array(
        'method'  => 'POST',
        'content' => http_build_query($params)
    )
);
$context    = stream_context_create($options);
$r          = file_get_contents($url, false, $context);