Methods called from an incompatible context are now deprecated, and will
   generate E_DEPRECATED errors when invoked instead of
   E_STRICT. Support for these calls will be removed in
   a future version of PHP.
  
An example of such a call is:
<?php
class A {
    function f() { echo get_class($this); }
}
class B {
    function f() { A::f(); }
}
(new B)->f();
?>
The above example will output:
Deprecated: Non-static method A::f() should not be called statically, assuming $this from incompatible context in - on line 7 B
   always_populate_raw_post_data
   will now generate an E_DEPRECATED error when
   $HTTP_RAW_POST_DATA is populated.
   New code should use
   php://input
   instead of $HTTP_RAW_POST_DATA, which will be removed
   in a future release. You can opt in for the new behaviour (in which
   $HTTP_RAW_POST_DATA is never defined hence no
   E_DEPRECATED error will be generated) by setting
   always_populate_raw_post_data
   to -1.
  
   The iconv and
   mbstring configuration options related
   to encoding have been deprecated in favour of
   default_charset.
   The deprecated options are: