PHP发送POST请求(三种方式)

class Request{
public static function post($url, $post_data = '', $timeout = 5){//curl

$ch = curl_init();
curl_setopt ($ch, CURLOPT_URL, $url);
curl_setopt ($ch, CURLOPT_POST, 1);
if($post_data != ''){
curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data);
}

curl_setopt ($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt ($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
curl_setopt($ch, CURLOPT_HEADER, false);
$file_contents = curl_exec($ch);
curl_close($ch);
return $file_contents;
}
public static function post2($url, $data){//file_get_content
$postdata = http_build_query(
$data
);
$opts = array('http' =>
array(
'method'  => 'POST',

'header'  => 'Content-type: application/x-www-form-urlencoded',

'content' => $postdata

)
);

$context = stream_context_create($opts);
$result = file_get_contents($url, false, $context);
return $result;
}
public static function post3($host,$path,$query,$others=''){//fsocket
$post="POST $path HTTP/1.1\r\nHost: $host\r\n";
$post.="Content-type: application/x-www-form-";
$post.="urlencoded\r\n${others}";
$post.="User-Agent: Mozilla 4.0\r\nContent-length: ";
$post.=strlen($query)."\r\nConnection: close\r\n\r\n$query";
$h=fsockopen($host,80);
fwrite($h,$post);
for($a=0,$r='';!$a;){
$b=fread($h,8192);
$r.=$b;
$a=(($b=='')?1:0);
}

fclose($h);
return $r;
}
}