Php捲曲發佈數據參數有時發送空

Question

我試圖用三個參數調用服務：uri，代碼和類型。但有時「type」參數發佈爲空，有時發佈正確。所以服務電話有時會成功，有時會失敗。我不改變任何東西，但參數「類型」有時是空的。我怎麼解決這個問題 ？

$curl_post_data = array( 
     "uri" => $uri, 
     "code" => $code, 
     "type" => $type 
    ); 

$post_data = http_build_query($curl_post_data); 
$curl = curl_init($service_url); 
curl_setopt($curl, CURLOPT_CONNECTTIMEOUT, 60); 
curl_setopt($curl, CURLOPT_TIMEOUT, 10); 
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true); 
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false); 
curl_setopt($curl, CURLOPT_SSL_VERIFYHOST, false); 
curl_setopt($curl, CURLOPT_POST, true); 
curl_setopt($curl, CURLOPT_POSTFIELDS, $post_data); 
curl_setopt($curl, CURLOPT_HEADER, false); 
curl_setopt($curl, CURLOPT_HTTPAUTH, xxx); 
curl_setopt($curl, CURLOPT_USERPWD, xxx); 
curl_setopt($curl, CURLOPT_PROXY, 'xxx'); 
curl_setopt($curl, CURLOPT_PROXYUSERPWD, 'xxxx'); 
curl_setopt($curl, CURLOPT_PROXYPORT, xxx); 
curl_setopt($curl, CURLOPT_PROXYAUTH, xxx); 
$curl_response = curl_exec($curl); 
if (false === $curl_response) { 
    return null; 
} 

Answer 1

http_build_query將刪除空值..看到第一個註釋：http://php.net/manual/en/function.http-build-query.php