New features in PHP8.4

In this talk, Release Manager from PHP 8.4 introduces some new features of PHP 8.4. She also presents some breaking changes of the upcoming release.

(betterCode PHP 2024)

1. New features in PHP8.4 Saki Takamachi
2. About me • PHP8.4 RM • PHP Foundation Core Developer • specialty: ext/pdo, ext/bcmath • Singer • Have 4 year old son and 1 year old daughter
3. PHP 8.4 has been released!
4. About smaller new features and changes • RoundingMode Enum • PDO Firebird Transaction isolation level …etc There are quite a lot of them, so I will introduce the ones I was involved with.
5. RoundingMode Enum by Saki Takamachi, Tim Düsterhus
6. RoundingMode Enum • PHP_ROUND_HALF_UP • PHP_ROUND_HALF_DOWN • PHP_ROUND_HALF_EVEN • PHP_ROUND_HALF_ODD + 4 new modes 4 new modes by Jorg Sowa
7. RoundingMode Enum this is correct
8. RoundingMode Enum -5 is "UP" to -10 ?
9. RoundingMode Enum Added four new modes and now them using the correct wording. The words "UP" and "DOWN" are intentionally not used because they are easily confused with the previous mode names.
10. RoundingMode Enum union type. We assume the int type it will be abolished at some point, but the timing is completely undecided.
11. PDO Firebird Transaction isolation level by Saki Takamachi
12. PDO Firebird Transaction isolation level • There was no way to set transaction isolation level • Until now, it was always "Read committed"
13. PDO Firebird Transaction isolation level There are three levels of transaction isolation level.
14. About major new features • Asymmetric visibility property • Lazy object • PDO driver specific sub-classes • Property hooks • BcMath\Number Class …etc
15. Asymmetric visibility property by Ilija Tovilo, Larry Garfield
16. Asymmetric visibility property Up to PHP 8.3, get and set visibility is always the same.
17. Asymmetric visibility property By using the Asymmetric visibility property, can write code like the one above.
18. Asymmetric visibility property I also often write like this: Up to PHP 8.3 often see code like this
19. Asymmetric visibility property Please ignore the red line :) From PHP 8.4, you can write like this!
20. Asymmetric visibility property private get, public set Set with weaker visibility than get are not allowed.
21. Lazy Object by Arnaud Le Blanc, Nicolas Grekas
22. Lazy Object There are two types of deferred object generation methods.
23. Lazy Object The return value of the callback is different. Ghost is void, proxy is object.
24. PDO driver specific sub-classes by Danack
25. PDO driver specific sub-classes • pdo_dblib • pdo_firebird • pdo_mysql • pdo_odbc • pdo_pgsql • pdo_sqlite ※ pdo_oci has been unbundled.
26. PDO driver specific sub-classes • Pdo\Dblib • Pdo\Firebird • Pdo\Mysql • Pdo\Odbc • Pdo\Pgsql • Pdo\Sqlite ※ pdo_oci has been unbundled. ※ Unbundled drivers can be subclassed as well.
27. Property hooks by Ilija Tovilo, Larry Garfield
28. Property hooks
29. Property hooks Validation typically protects against accepting invalid values.
30. Property hooks Please ignore the red line :) Validation can be done with property hooks
31. Property hooks fullName is a virtual property. There is no need to persist data, as a return value is always generated.
32. Property hooks Since it has become easier to use public properties, there will likely be more opportunities to specify properties in interfaces.
33. BcMath\Number Class by Saki Takamachi
34. Before talking about Class, let me talk about improving performance and adding functions :)
35. BCMath performance gain PHP 8.3 • add: 3.0387s • sub: 3.0248s • mul: 5.7315s • div: 25.762s Results of a certain benchmark (rough) Calculate numbers with a maximum of about 60 digits instead of unrealistically large values PHP 8.4 • add: 1.4444s • sub: 1.4745s • mul: 2.0621s • div: 2.9411s
36. BCMath Added functions • bcround() • bcfloor() • bcceil() • bcdivmod()
37. BCMath Added functions Division, which used to be executed twice, can now be executed once.
38. BcMath\Number Class BcMath\Number is a readonly class. That is, it is immutable.
39. BcMath\Number Class Since it is a Final class, inheritance is not possible. There was a very long discussion about whether or not to allow inheritance.
40. BcMath\Number Class Supports four arithmetic operations, pow, mod, and comparison operators. Also, this class is Stringable.
41. BcMath\Number Class The argument also accepts int. Be careful when passing a float, as an implicit cast to int is attempted, not to string.
42. BcMath\Number Class The scale will be set automatically.
43. BcMath\Number Class If the calculation is not divisible, what is the result....?
44. BcMath\Number Class For calculations with methods, you can explicitly specify the scale with an optional argument.
45. BcMath\Number Class If you do not explicitly specify the scale of the result, add up to 10 to "dividend Scale."
46. BcMath\Number Class If the calculation ends before adding 10 to scale, no more scale are added.
47. BcMath\Number Class GMP does not handle decimals, so it does not compete completely with BCMath, and each has its place.
48. Thank you for your attention! Enjoy betterCode() and have a nice day!