php如何调用api接口

$post_data = array(); 
$post_data['clientname'] = "test08"; 
$post_data['clientpasswd'] = "test08"; 
$post_data['submit'] = "submit"; 
$url='http://xxx.xxx.xxx.xx/xx/xxx/top.php'; 
$o=""; 
foreach ($post_data as $k=>$v) 
{ 
 $o.= "$k=".urlencode($v)."&"; 
} 
$post_data=substr($o,0,-1); 
$ch = curl_init(); 
curl_setopt($ch, CURLOPT_POST, 1); 
curl_setopt($ch, CURLOPT_HEADER, 0); 
curl_setopt($ch, CURLOPT_URL,$url); 
//为了支持cookie 
curl_setopt($ch, CURLOPT_COOKIEJAR, 'cookie.txt'); 
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data); 
$result = curl_exec($ch);

$URL=‘http://xxx.xxx.xxx.xx/xx/xxx/top.php'; 
$post_data['clientname'] = "test08"; 
$post_data['clientpasswd'] = "test08"; 
$post_data['submit'] = "ログイン"; 
$referrer=""; 
// parsing the given URL 
$URL_Info=parse_url($URL); 
// Building referrer 
if($referrer=="") // if not given use this script as referrer 
$referrer=$_SERVER["SCRIPT_URI"]; 
 
// making string from $data 
foreach($post_data as $key=>$value) 
$values[]="$key=".urlencode($value); 
 
$data_string=implode("&",$values); 
// Find out which port is needed - if not given use standard (=80) 
if(!isset($URL_Info["port"])) 
$URL_Info["port"]=80; 
// building POST-request: 
$request.="POST ".$URL_Info["path"]." HTTP/1.1\n"; 
$request.="Host: ".$URL_Info["host"]."\n"; 
$request.="Referer: $referrer\n"; 
$request.="Content-type: application/x-www-form-urlencoded\n"; 
$request.="Content-length: ".strlen($data_string)."\n"; 
$request.="Connection: close\n"; 
$request.="\n"; 
$request.=$data_string."\n"; 
$fp = fsockopen($URL_Info["host"],$URL_Info["port"]); 
fputs($fp, $request); 
while(!feof($fp)) { 
 $result .= fgets($fp, 128); 
} 
fclose($fp);