php发送post请求的三种方法

方法一：

/**
 * 发送post请求
 * @param string $url 请求地址
 * @param array $post_data post键值对数据
 * @return string
 */
function send_post($url, $post_data) {

  $postdata = http_build_query($post_data);
  $options = array(
    'http' => array(
      'method' => 'post',
      'header' => 'content-type:application/x-www-form-urlencoded',
      'content' => $postdata,
      'timeout' => 15 * 60 // 超时时间（单位:s）
    )
  );
  $context = stream_context_create($options);
  $result = file_get_contents($url, false, $context);

  return $result;
}

//使用方法
$post_data = array(
  'username' => 'stclair2201',
  'password' => 'handan'
);
send_post('//www.jb51.net', $post_data);

方法二：socket版本

<?php
/**
 * socket版本
 * 使用方法：
 * $post_string = "app=socket&version=beta";
 * request_by_socket('chajia8.com', '/restserver.php', $post_string);
 */
function request_by_socket($remote_server,$remote_path,$post_string,$port = 80,$timeout = 30) {
  $socket = fsockopen($remote_server, $port, $errno, $errstr, $timeout);
  if (!$socket) die("$errstr($errno)");
  fwrite($socket, "post $remote_path http/1.0");
  fwrite($socket, "user-agent: socket example");
  fwrite($socket, "host: $remote_server");
  fwrite($socket, "content-type: application/x-www-form-urlencoded");
  fwrite($socket, "content-length: " . （strlen($post_string) + 8） . "");
  fwrite($socket, "accept:*/*");
  fwrite($socket, "");
  fwrite($socket, "mypost=$post_string");
  fwrite($socket, "");
  $header = "";
  while ($str = trim(fgets($socket, 4096))) {
    $header .= $str;
  }

  $data = "";
  while (!feof($socket)) {
    $data .= fgets($socket, 4096);
  }

  return $data;
}
?>

方法三：curl版本

<?php
/**
 * curl版本
 * 使用方法：
 * $post_string = "app=request&version=beta";
 * request_by_curl('//www.jb51.net/restserver.php', $post_string);
 */
function request_by_curl($remote_server, $post_string) {
  $ch = curl_init();
  curl_setopt($ch, curlopt_url, $remote_server);
  curl_setopt($ch, curlopt_postfields, 'mypost=' . $post_string);
  curl_setopt($ch, curlopt_returntransfer, true);
  curl_setopt($ch, curlopt_useragent, "jb51.net's curl example beta");
  $data = curl_exec($ch);
  curl_close($ch);

  return $data;
}
?>

下面是其他网友的方法：

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;
  }
}

大家可以根据需要选择适合自己的即可。