<?php
class T {
  private function show()
  {
    echo "我是T里面的私有函数：show\n";
  }
  protected function who()
  {
    echo "我是T里面的保护函数：who\n";
  }
  public function name()
  {
    echo "我是T里面的公共函数：name\n";
  }
}
$test = new T();
$func = Closure::bind(function(){
  $this->who();
  $this->name();
  $this->show();
}, $test);
$func();

我是T里面的保护函数：who
我是T里面的公共函数：name
我是T里面的私有函数：show

$test = new StdClass();
var_dump($test);
$func = Closure::bind(function($obj){
  $obj->name = "燕睿涛";
}, null);
$func($test);
var_dump($test);

object(stdClass)#1 (0) {
}
object(stdClass)#1 (1) {
 ["name"]=>
 string(9) "燕睿涛"
}

<?php
class T {
  private function show()
  {
    echo "我是T里面的私有函数：show\n";
  }
  protected function who()
  {
    echo "我是T里面的保护函数：who\n";
  }
  public function name()
  {
    echo "我是T里面的公共函数：name\n";
  }
}
$func = Closure::bind(function ($obj) {
  $obj->show();
}, null);
$test = new T();
$func($test);

<?php
class T {
  private function show()
  {
    echo "我是T里面的私有函数：show\n";
  }
  protected function who()
  {
    echo "我是T里面的保护函数：who\n";
  }
  public function name()
  {
    echo "我是T里面的公共函数：name\n";
  }
}
$func = function () {
  $this->show();
  $this->who();
  $this->name();
};
$funcNew = $func->bindTo(new T(), T::class);
$funcNew();

我是T里面的私有函数：show
我是T里面的保护函数：who
我是T里面的公共函数：name

// 文件autoload_real.php
call_user_func(\Composer\Autoload\ComposerStaticInit898ad46cb49e20577400c63254121bac::getInitializer($loader));
// 文件autoload_static.php
public static function getInitializer(ClassLoader $loader)
{
  return \Closure::bind(function () use ($loader) {
    $loader->prefixLengthsPsr4 = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$prefixLengthsPsr4;
    $loader->prefixDirsPsr4 = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$prefixDirsPsr4;
    $loader->prefixesPsr0 = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$prefixesPsr0;
    $loader->classMap = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$classMap;
  }, null, ClassLoader::class);
}

call_user_func(\Composer\Autoload\ComposerStaticInit898ad46cb49e20577400c63254121bac::getInitializer(), $loader);
public static function getInitializer()
{
  return \Closure::bind(function ($loader) {
    $loader->prefixLengthsPsr4 = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$prefixLengthsPsr4;
    $loader->prefixDirsPsr4 = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$prefixDirsPsr4;
    $loader->prefixesPsr0 = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$prefixesPsr0;
    $loader->classMap = ComposerStaticInit25885cdf386fdaafc0bce14bb5a7d06e::$classMap;
  }, null, ClassLoader::class);
}