...意外に便利だった!!

2019/10/30 PHP勉強会@東京で話したスライドです。

Transcript

1. ҙ֎ʹศརͩͬͨ 2019/10/30 PHPษڧձ@౦ژ લా ࿨ਓ
2. ࣗݾ঺հ w લా
   ࿨ਓ
   w !DIJSPSVYYYY
   w 3PYY
3. w εϙϯαʔืूதͰ͢ʂʂ
4. ҙ֎ʹศརͩͬͨ
5. ʮʯҙ֎ʹศརͩͬͨ
6. 1)1ʹ͓͚Δʮʯ
   ͭ͋Δ
7. ՄมݸҾ਺ؔ਺ function printArgs(...$inputs) { echo $inputs[0]; // apple echo $inputs[1]; // banana echo $inputs[2]; // chocolate } printArgs('apple', 'banana', 'chocolate');
8. Ҿ਺ͷΞϯύοΫ function printArgs($a, $b, $c) { // (ུ) } $args = ['apple', 'banana', 'chocolate']; printArgs(...$args);
9. ஌ͬͯ͸͍͕ͨʜ w ػೳ͕ଘࡏ͢Δ͜ͱ͸஌ͬͯͨ
   w Ͱ΋࣮ࡍ͸શવ࢖ͬͯͳ͔ͬͨ
   w ΠϚΠν࢖͍Ͳ͜Ζ͕Θ͔Βͳ͔ͬͨ
   ‎ ࠷ۙɺศརͳ࢖͍ํΛݟ͚ͭͨ
10. ྫ୊ w ࣗ෼Ͱఆٛͨ͠4UBUVTΫϥε͕͋Δ
    w 4UBUVTΛෳ਺ѻ͏Ϋϥε͕΄͍͠
    w ഑ྻΛϥοϓͨ͠Ϋϥε
    w ཁ݅͸ҎԼ
    w ೚ҙͷ਺ͷ4UBUVTΠϯελϯεΛཁૉʹ࣋ͭ
    w 4UBUVTΠϯελϯεҎ֎Λཁૉʹ࣋ͬͯ͸͍͚ͳ͍
    w Ωʔ͸࿈൪ͷΈʹ͢Δ ࿈૝഑ྻʹ͠ͳ͍
11. ·ͣ͸ී௨ʹ࣮૷͠·͢
12. ී௨ͷ࣮૷ class StatusCollection { private $items; public function __construct(array $items) { $this->items = $items; } } $items = [Status::random(), Status::random(), Status::random()]; new StatusCollection($items);
13. ී௨ͷ࣮૷ class StatusCollection { private $items; public function __construct(array $items) { foreach ($items as $item) { if (!$item instanceof Status) { throw new InvalidArgumentException(); } } $this->items = $items; } } $items = [Status::random(), Status::random(), Status::random()]; new StatusCollection($items);
14. ී௨ͷ࣮૷ class StatusCollection { private $items; public function __construct(array $items) { foreach ($items as $item) { if (!$item instanceof Status) { throw new InvalidArgumentException(); } } $this->items = array_values($items); } } $items = [Status::random(), Status::random(), Status::random()]; new StatusCollection($items);
15. Λ࢖͍͖ͬͯ·͢ʂ
16. Λ࢖࣮ͬͨ૷ class StatusCollection { private $items; public function __construct(...$items) { foreach ($items as $item) { if (!$item instanceof Status) { throw new InvalidArgumentException(); } } $this->items = $items; } } $items = [Status::random(), Status::random(), Status::random()]; new StatusCollection(...$items);
17. Λ࢖࣮ͬͨ૷ class StatusCollection { private $items; public function __construct(Status ...$items) { $this->items = $items; } } $items = [Status::random(), Status::random(), Status::random()]; new StatusCollection(...$items);
18. ศརʂʂ
19. ·ͱΊ w ʮʯΛ࢖͏ͱҎԼͷέʔεͰϥΫʹͳΔ
    w ഑ྻͷΩʔʹ͍ͭͯߟ͑ͨ͘ͳ͍ͱ͖
    w ഑ྻͷཁૉͷܕΛറΓ͍ͨͱ͖