PHP 8.0 Named Arguments Constructor Property Promotion Nullsafe Operator with short-circuiting user?->getAddress(geoip())?->country; ]]> Match Expression, Union Types 30, 'jan', 1, 'mar', 3, 'may', 5, 'jul', 7, 'aug', 8, 'oct', 10, 'dec', 12 => 31, 'feb', 2 => $leap ? 29 : 28, default => throw new InvalidArgumentException("Invalid month"), }; } ]]> weakMap - Map objects to arbitrary values without preventing GC Attributes - Structured metadata