| 7.0.0 | Defining (compatible) properties in two used traits no longer triggers an error. | 
     
      | 5.6.0 | Added: The __debugInfo() method. | 
     
      | 5.5.0 | Added: The ::class magic constant. | 
     
      | 5.5.0 | Added: finally to handle exceptions. | 
     
      | 5.4.0 | Added: traits. | 
     
      | 5.4.0 | Changed: If an abstract class
       defines a signature for the constructor it will now be enforced. | 
     
      | 5.3.3 | Changed: Methods with the same name as the last element of
       a namespaced
       class name will no longer be treated as constructor. This change doesn't
       affect non-namespaced classes. | 
     
      | 5.3.0 | Changed: Classes that implement interfaces with methods that have default 
       values in the prototype are no longer required to match the interface's default 
       value. | 
     
      | 5.3.0 | Changed: It's now possible to reference the class using a variable (e.g.,
       echo $classname::constant;).
       The variable's value can not be a keyword (e.g., self,
       parent or static). | 
     
      | 5.3.0 | Changed: An E_WARNINGlevel error is issued if
       the magic overloading
       methods are declared static.
       It also enforces the public visibility requirement. | 
     
      | 5.3.0 | Changed: Prior to 5.3.0, exceptions thrown in the
       __autoload function could not be
       caught in the catch block, and
       would result in a fatal error. Exceptions now thrown in the __autoload function
       can be caught in the catch block, with
       one provison. If throwing a custom exception, then the custom exception class must
       be available. The __autoload function may be used recursively to autoload the
       custom exception class. | 
     
      | 5.3.0 | Added: The __callStatic method. | 
     
      | 5.3.0 | Added: heredoc
       and nowdoc
       support for class const and property definitions.
       Note: heredoc values must follow the same rules as double-quoted strings,
       (e.g., no variables within). | 
     
      | 5.3.0 | Added: Late Static Bindings. | 
     
      | 5.3.0 | Added: The __invoke() method. | 
     
      | 5.2.0 | Changed: The __toString()
       method was only called when it was directly combined with
       echo or print.
       But now, it is called in any string context (e.g. in
       printf with %s modifier) but not
       in other types contexts (e.g. with %d modifier).
       Since PHP 5.2.0, converting objects without a __toString
       method to string emits a E_RECOVERABLE_ERRORlevel error. | 
     
      | 5.1.3 | Changed: In previous versions of PHP 5, the use of var
       was considered deprecated and would issue an E_STRICTlevel error. It's no longer deprecated, therefore does not emit the error. | 
     
      | 5.1.0 | Changed: The __set_state() static
       method is now called for classes exported by var_export. | 
     
      | 5.1.0 | Added: The __isset()
       and __unset() methods. |