PHP 8.5: #[NoDiscard] Attribute
A new attribute for functions (%TARGET_FUNCTION%) and methods (%TARGET_METHOD%).
It enforces that the calling function consumes the return value.
setDate(2025, 5, 4);
?>]]>
Warning: The return value of method DateTimeImmutable::setDate()
should either be used or intentionally ignored by casting it as
(void), as DateTimeImmutable::setDate() does not modify the
object itself in /tmp/discard.php on line 3
A %(void)% cast disables it:
setDate(2025, 5, 4);
?>]]>
You can't use %#[Discard]% when:
The function is typed with %: void% or %: never%
For magic methods (including the constructor) that require %: void%, or have no return type at all
For property hooks