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  Changed Functions
   PHP Core
    
     
      set_error_handler can now be called with NULLas
      an argument to reset the error handler.
     
      When called with NULL, set_error_handler and
      set_exception_handler now return the previous error
      or exception handler, respectively.
     
      json_encode now accepts depthparameter.
     
      The behaviour of pack and
      unpack with the "a" and "A" format codes has
      changed.
      Detailed notes on these changes are available.
     
     
   
   
    
     
       MessageFormatter::format and related functions
      now accept named arguments and mixed numeric and named arguments when PHP
      is linked to ICU 4.8 or later.
     
    
     
       MessageFormatter::format and related functions
      no longer error when an insufficient number of arguments have been
      provided. Instead, the placeholders will not be substituted.
     
    
     
       MessageFormatter::format and
       MessageFormatter::parse are no longer limited to
      second precision when dealing with times.
     
    
     
       IntlDateFormatter::__construct and
      datefmt_create now accept
      IntlTimeZone and
      DateTimeZone objects for the
      timezoneargument, and
      IntlCalendar objects for thecalendarargument. Furthermore, if the time zone
      is omitted and thecalendardoesn't specify a time
      zone, PHP's default time zone from
      date_default_timezone_get is now used instead of the
      default ICU time zone.
     
       IntlDateFormatter::getCalendar and
      datefmt_get_calendar return false if the
      IntlDateFormatter object was created with an
      IntlCalendar instance instead of one of the
      IntlDateFormatter constants.
     
    
     
       IntlDateFormatter::setCalendar and
      datefmt_set_calendar now accept
      IntlCalendar objects in addition to the
      IntlDateFormatter constants.
     
    
     
       IntlDateFormatter::format and
      datefmt_format now accept
      IntlCalendar objects.
     
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