型を意識したPHPアプリケーション開発

Transcript

1. ܕΛҙࣝͨ͠
   1)1ΞϓϦέʔγϣϯ։ൃ ɹ!shin1x1 2017//08 phpcon 2017

2. https://php-genba.shin1x1.com/

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   ͍͞͝ʹ

4. 1)1ͷܕγεςϜ

5. &MPRVFOU 3FQPTJUPSZ $foo = 123; echo gettype($foo), PHP_EOL; => integer

   $foo = 'Hello'; echo gettype($foo), PHP_EOL; => string $foo = [1, 2, 3]; echo gettype($foo), PHP_EOL; => array ม਺͸ܕΛ࣋ͨͳ͍ɺ஋͕ܕΛ࣋ͭ

6. &MPRVFOU 3FQPTJUPSZ echo 10 + 5, PHP_EOL; => 15 ୅਺ԋࢉࢠ͸
   JOU
   ܕͱ
   qPBU
   ܕ͕ର৅
   

   ҉໧తܕม׵

7. &MPRVFOU 3FQPTJUPSZ echo 10 + "5", PHP_EOL; => 15 TUSJOH
   ͕
   JOU
   ʹม׵͞ΕΔ
   

   ҉໧తܕม׵

8. &MPRVFOU 3FQPTJUPSZ echo 10 + "5e", PHP_EOL; => 15 ҉໧తܕม׵

9. &MPRVFOU 3FQPTJUPSZ echo 10 + "5e2", PHP_EOL; => ??? ҉໧తܕม׵

10. &MPRVFOU 3FQPTJUPSZ echo 10 + "5e2", PHP_EOL; => 510 ҉໧తܕม׵

11. &MPRVFOU 3FQPTJUPSZ 5e2 ʢ5=Ծ਺෦, 2=ࢦ਺෦, 10=ج਺ʣ => 5 * (10

    ** 2) => 500 ˞ࢦ਺දه

12. &MPRVFOU 3FQPTJUPSZ <?php declare(strict_types=1); function double(int $i): int { return

    $i * 2; } double(1); // 2 double(“5e”); // TypeError ܕએݴ

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14. ܕΛ׆༻ͨ͠1)1ίʔυͷ࣮૷

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    !TIJOY %FNP https://github.com/shin1x1/phpcon2017

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    !TIJOY υϝΠϯʹಛԽͨ͠ܕΛ࡞Δ w
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19. &MPRVFOU 3FQPTJUPSZ // ܕએݴແ͠ function calculate($price, $taxRate) // υϝΠϯಛԽܕͰܕએݴ function

    calculate( Price $price, TaxRate $taxRate): PriceWithTax

20. υϝΠϯಛԽܕͷ࣮૷
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22. &MPRVFOU 3FQPTJUPSZ // ܧঝ final class PriceWithTax extends Price {}

    ܧঝ $price = PriceWithTaxCalculator::calculate($price, $taxRate); // PriceWithTax ΋ Price ܕͳͷͰಈ͍ͯ͠·͏ $price = PriceWithTaxCalculator::calculate($price, $taxRate);

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25. &MPRVFOU 3FQPTJUPSZ ϑΝΫτϦϝιου public static function of(float $value): self {

    return new self($value); } public static function ofByInt(int $value): self { return new self($value / 100); }

26. &MPRVFOU 3FQPTJUPSZ ϑΝΫτϦϝιου // float TaxRate::of(0.08); // int TaxRate::ofByInt(8);

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    Ͱܕݕࠪ https://github.com/phan/phan

30. ͍͞͝ʹ

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