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);