ReflectionProperty::setAccessible()

(PHP 5 >= 5.3.0, PHP 7)

Set property accessibility

说明

publicReflectionProperty::setAccessible(bool $accessible) : void

Sets a property to be accessible. For example, it may allow protected and private properties to be accessed.

参数

$accessible

TRUEto allow accessibility,orFALSE.

返回值

没有返回值。

参见

• ReflectionProperty::isPrivate() Checks if property is private
• ReflectionProperty::isProtected() Checks if property is protected

Note that the property will only become accessible using the ReflectionProperty class. The property is still private or protected in the class instances.
<?php
class MyClass {
   private $myProperty = true;
}
$class = new ReflectionClass("MyClass");
$property = $class->getProperty("myProperty");
$property->setAccessible(true);
$obj = new MyClass();
echo $property->getValue($obj); // Works
echo $obj->myProperty; // Doesn't work (error)
?>

If you are using < PHP 5.3 and need to get the private attributes and values, you can use this method:
This is what you are doing:
<?php
$obj_with_privates = new MyObject();
$class   = get_class($obj_with_privates);
$vars   = get_object_vars($obj_with_privates);
//will not show private attributes
print_r($vars);
$reflection = new ReflectionClass( $class );
$attributes = $reflection->getProperties();
//still no private access!
print_r($attributes);
?>
This is what you should do:
<?php
$obj_with_privates = new MyObject();
$class     = get_class( $obj_with_privates );
$reflection = new ReflectionClass( $class );
$abstract  = $reflection->getMethods( ReflectionMethod::IS_ABSTRACT );
$priv_attr = $reflection->getProperties( ReflectionProperty::IS_PRIVATE );
$privates  = array();
$parent   = get_parent_class( $class );
$child     = $class;
$constructor = $reflection->getConstructor();
//If the class has abstract methods you need to implement them
$abstr_methods = "";
if(sizeof($abstr_methods))
{
  foreach($abstract as $method)
  {
    $mname = $method->name;
    $abstr_methods .= "public function $mname(){return false;}";
  }
}
//Convert private attributes to public attributes
if(sizeof($priv_attr))
{
  $parseable = unserialize(str_replace("\0$class\0", "\0*\0", serialize($obj)));
  foreach($priv_attr as $attribute)
  {
    $aname = $attribute->name;
    $privates[$aname] = $parseable->$aname;
  }
}
      
$temp_child_class = "temp" . str_replace("_", "", "$class");
//You can gain access to protected attributes by extending the target class
$class_def = "
class $temp_child_class extends $class{
  $constructor
  public function reflect_getmyvars(){
    return get_object_vars(\$this);
  }
  $abstr_methods
}
";
//place class definition in memory
eval($class_def);
//generate object from dynamic class
$tcobj =@ new $temp_child_class;  
//call the method we added to the object (to access protected vars)
$vars = $tcobj->reflect_getmyvars();
$attribs = array_merge($vars, $privates);
//will now show private attributes
print_r($attribs);
?>

Have you tried:
<?php
echo "PHP Version: ".phpversion()."\n";
class Foo 
{
  private  $bar = "private";
  protected $bar2 = "protected";
  public  $bar3 = "public";
}
$obj = new Foo;
$arr = (array)$obj;
print_r($arr);
?>
Output:
PHP Version: 5.2.12
Array
(
  [Foobar] => private
  [*bar2] => protected
  [bar3] => public
)
PHP Version: 5.1.6
Array
(
  [Foobar] => private
  [*bar2] => protected
  [bar3] => public
)