爲什麼「curl_exec」打印「null」？

可能重複：
curl_exec printing results when I don't want too 爲什麼「curl_exec」打印「null」？

我有一個問題，即功能「curl_exec」打印文本到屏幕上。這裏是我的代碼：

$ch = curl_init("https://go.urbanairship.com/api/push/"); 
if ($ch) { 
    curl_setopt($ch, CURLOPT_POST, 1); 
    curl_setopt($ch, CURLOPT_USERPWD, "***:***"); // omitted 
    curl_setopt($ch, CURLOPT_HTTPHEADER, array ("Content-Type: application/json")); 
    curl_setopt($ch, CURLOPT_POSTFIELDS, '{"device_tokens": ["' . $device_token . '"], "aps": {"alert": "Hello! fucker!"}}'); 
    curl_exec($ch); 
}

呼喚：print_r(curl_getinfo($ch));curl_exec($ch);後給出。

Array ([url] => https://go.urbanairship.com/api/push/ 
     [content_type] => application/json; charset=utf-8 
     [http_code] => 200 
     [header_size] => 222 
     [request_size] => 327 
     [filetime] => -1 
     [ssl_verify_result] => 0 
     [redirect_count] => 0 
     [total_time] => 0.111714 
     [namelookup_time] => 0.029124 
     [connect_time] => 0.036017 
     [pretransfer_time] => 0.065684 
     [size_upload] => 0 [size_download] => 4 
     [speed_download] => 35 
     [speed_upload] => 0 
     [download_content_length] => 4 
     [upload_content_length] => 0 
     [starttransfer_time] => 0.111686 
     [redirect_time] => 0 
    )

請求成功。我覺得奇怪的是它打印出空白。任何幫助？

來源

2012-01-28 Collin Price

打印到標準輸出是其運作的古怪的默認模式。你需要['_RETURNTRANSFER']（http://php.net/manual/en/function.curl-exec.php）。 – mario 2012-01-28 19:42:39

添加

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

來源

2012-01-28 19:44:29

爲什麼「curl_exec」打印「null」？

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