PHP类中的魔术方法（Magic Method）简明总结

class A
 {
  function A()
  {
   echo "build A";
  }

  function __destruct()
  {
   echo "destroy A";
  }
 }

 $obj = new A();
 //unset($obj);

namespace Foo;
class Bar {
  public function Bar() {
    // treated as constructor in PHP 5.3.0-5.3.2
    // treated as regular method as of PHP 5.3.3
  }
}

function __construct()
  {
   echo "construct A";
  }

  function A()
  {
   echo "build A";
  }

  function __destruct()
  {
   echo "destroy A";
  }
 }

class MethodTest
{
  public function __call($name, $arguments)
  {
    // Note: value of $name is case sensitive.
    echo "Calling object method '$name' "
       . implode(' ', $arguments). "<br>";
  }

  public static function __callStatic($name, $arguments)
  {
    // Note: value of $name is case sensitive.
    echo "Calling static method '$name' "
       . implode(' ', $arguments). "<br>";
  }
}

$obj = new MethodTest;
$obj->runTest('in','object','context');
MethodTest::runTest('in','static','context');

class TestMagicCallMethod {
  public function foo()
  {
    echo __METHOD__.PHP_EOL."<br>";
  }

  public function __call($method, $args)
  {
    echo __METHOD__.PHP_EOL."<br>";
    if(method_exists($this, $method))
    {
      $this->$method();
    }
  }
  
  protected function bar()
  {
    echo __METHOD__.PHP_EOL."<br>";
  }

  private function baz()
  {
    echo __METHOD__.PHP_EOL."<br>";
  }
}

$test  =  new TestMagicCallMethod();
$test->foo();
/**
 * Outputs:
 * TestMagicCallMethod::foo
 */

$test->bar();
/**
 * Outputs:
 * TestMagicCallMethod::__call
 * TestMagicCallMethod::bar
 */

$test->baz();
/**
 * Outputs:
 * TestMagicCallMethod::__call
 * TestMagicCallMethod::baz
 */

class Test
{
  public function __get($key)
  {
   echo $key . " not exists";
  }
  public function __set($key,$value)
  {
   echo $key . " = ".$value;
  }
}

$t = new Test();
echo $t->name."<br>";
$t->name = "abc";

class Test
{
  private $name = "abc";
  private $age = 12;

  public function __toString()
  {
    return "name : $this->name, age : $this->age";
  }
}

$t = new Test();
echo $t;