<?php 
  // create curl resource 
  $ch = curl_init(); 

  // set url 
  curl_setopt($ch, CURLOPT_URL, "baidu.com"); 

  //return the transfer as a string 
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

  // $output contains the output string 
  $output = curl_exec($ch); 

  //echo output
  echo $output;

  // close curl resource to free up system resources 
  curl_close($ch);   
?>

//通过curl进行GET请求的案例
<?php 
  // create curl resource 
  $ch = curl_init(); 

  // set url 
  curl_setopt($ch, CURLOPT_URL, "https://github.com/search?q=react"); 

  //return the transfer as a string 
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

  // $output contains the output string 
  $output = curl_exec($ch); 

  //echo output
  echo $output;

  // close curl resource to free up system resources 
  curl_close($ch);   
?>

//testRespond.php
<?php 
  $phpInput=file_get_contents('php://input');
  echo urldecode($phpInput);
?>

<?php 
  $data=array(
  "name" => "Lei",
  "msg" => "Are you OK?"
  );

  $ch = curl_init(); 

  curl_setopt($ch, CURLOPT_URL, "http://测试服务器的IP马赛克/testRespond.php"); 
  curl_setopt($ch, CURLOPT_POST, 1);
  //The number of seconds to wait while trying to connect. Use 0 to wait indefinitely.
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60); 
  curl_setopt($ch, CURLOPT_POSTFIELDS , http_build_query($data));
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

  $output = curl_exec($ch); 

  echo $output;

  curl_close($ch);   
?>

<?php 
  $data='{"name":"Lei","msg":"Are you OK?"}';

  $ch = curl_init(); 

  curl_setopt($ch, CURLOPT_URL, "http://测试服务器的IP马赛克/testRespond.php"); 
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60); 
  curl_setopt($ch, CURLOPT_HTTPHEADER, array('Content-Type: application/json', 'Content-Length:' . strlen($data)));
  curl_setopt($ch, CURLOPT_POSTFIELDS , $data);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

  $output = curl_exec($ch); 

  echo $output;

  curl_close($ch);   
?>

<?php
  if($_FILES){
    $filename = $_FILES['upload']['name'];
     $tmpname = $_FILES['upload']['tmp_name'];
     //保存图片到当前脚本所在目录
     if(move_uploaded_file($tmpname,dirname(__FILE__).'/'.$filename)){
      echo ('上传成功');
     }
  }
?>

<?php 
  $data = array('name'=>'boy', "upload"=>"@boy.png");

  $ch = curl_init(); 

  curl_setopt($ch, CURLOPT_URL, "http://远程服务器地址马赛克/testRespond.php"); 
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60); 
  curl_setopt($ch, CURLOPT_POSTFIELDS , $data);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

  $output = curl_exec($ch); 

  echo $output;

  curl_close($ch);     
?>

<?php 
  $data = array('name'=>'boy', "upload"=>"");
  $ch = curl_init(); 

  $data['upload']=new CURLFile(realpath(getcwd().'/boy.png'));

  curl_setopt($ch, CURLOPT_URL, "http://115.29.247.189/test/testRespond.php");
  curl_setopt($ch, CURLOPT_POST, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60); 
  curl_setopt($ch, CURLOPT_POSTFIELDS , $data);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 

  $output = curl_exec($ch); 

  echo $output;

  curl_close($ch);     
?>

<?php 
  $ch = curl_init(); 

  $fp=fopen('./girl.jpg', 'w');

  curl_setopt($ch, CURLOPT_URL, "http://远程服务器地址马赛克/girl.jpg"); 
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 60); 
  curl_setopt($ch, CURLOPT_FILE, $fp); 

  $output = curl_exec($ch); 
  $info = curl_getinfo($ch);

  fclose($fp);

  $size = filesize("./girl.jpg");
  if ($size != $info['size_download']) {
    echo "下载的数据不完整，请重新下载";
  } else {
    echo "下载数据完整";
  }

  curl_close($ch);  
?>

function curl_auth($url,$user,$passwd){
  $ch = curl_init();
  curl_setopt_array($ch, [
    CURLOPT_USERPWD => $user.':'.$passwd,
    CURLOPT_URL   => $url,
    CURLOPT_RETURNTRANSFER => true
  ]);
  $result = curl_exec($ch);
  curl_close($ch);
  return $result;
}

$authurl = 'http://要请求HTTP认证的地址';

echo curl_auth($authurl,'vace','passwd');

<?php 
 //设置post的数据 
 $post = array ( 
  'email' => '账户', 
  'pwd' => '密码'
 ); 
 //登录地址 
 $url = "登陆地址"; 
 //设置cookie保存路径 
 $cookie = dirname(__FILE__) . '/cookie.txt'; 
 //登录后要获取信息的地址 
 $url2 = "登陆后要获取信息的地址"; 
 //模拟登录 
 login_post($url, $cookie, $post); 
 //获取登录页的信息 
 $content = get_content($url2, $cookie); 
 //删除cookie文件 
 @ unlink($cookie);

 var_dump($content);  
?>

login_post($url, $cookie, $post)
get_content($url2, $cookie)
//模拟登录 
function login_post($url, $cookie, $post) { 
  $curl = curl_init();
  curl_setopt($curl, CURLOPT_URL, $url);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, 0);
  curl_setopt($curl, CURLOPT_COOKIEJAR, $cookie);
  curl_setopt($curl, CURLOPT_POST, 1);
  curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($post));
  curl_exec($curl); 
  curl_close($curl);
}
//登录成功后获取数据 
function get_content($url, $cookie) { 
  $ch = curl_init(); 
  curl_setopt($ch, CURLOPT_URL, $url); 
  curl_setopt($ch, CURLOPT_HEADER, 0); 
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); 
  curl_setopt($ch, CURLOPT_COOKIEFILE, $cookie); 
  $rs = curl_exec($ch); 
  curl_close($ch); 
  return $rs; 
}