Description:
------------
php53 --rf copy
Function [ <internal:standard> function copy ] {

  - Parameters [3] {
    Parameter #0 [ <required> $source_file ]
    Parameter #1 [ <required> $destination_file ]
    Parameter #2 [ <optionnal> $context ]
  }
}

php54 --rf copy
Function [ <internal:standard> function copy ] {

  - Parameters [3] {
    Parameter #0 [ <required> $source_file ]
    Parameter #1 [ <required> $destination_file ]
    Parameter #2 [ <required> $context ]
  }
}

Starting from 5.4, copy() arginfo decl has been changed from ZEND_BEGIN _ARG_INFO_EX to ZEND_BEGIN _ARG_INFO , making all parameters required for Reflection. $context is though optionnal


Test script:
---------------
$r = new \ReflectionFunction('copy');
 
foreach($r->getParameters() as $p) {
    var_dump($p->isOptional());	
}

Expected result:
----------------
bool(false)
bool(false)
bool(true)

Actual result:
--------------
bool(false)
bool(false)
bool(false)