PHP7.2で始める型宣言

Talked in EC Tech Meeting in GMO Pepabo inc

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   w ͦͷதͰ΋ɺ1)1
   
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3. w ൃදͷ಺༰Λ͖ͬͪΓ֮͑Δඞཁ͸ͳ͍Ͱ͢
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   w ػೳͷ࢖͍ํ͸ௐ΂ΒΕΔ͚Ͳ
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5. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3(3); } catch (TypeError $e) { print "TypeError!"; } // => 27
6. ܕએݴ
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   w ֤όʔδϣϯͰࢦఆͰ͖Δܕʹ͍ͭͯ͸
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7. ܕએݴͷແ͍࣮૷
8. class Calculator { public static function pow3($n) { return $n ** 3; } } print Calculator::pow3(3); // => 27
9. class Calculator { public static function pow3($n) { return $n ** 3; } } print Calculator::pow3("string"); // ???
10. class Calculator { public static function pow3($n) { return $n ** 3; } } print Calculator::pow3("string"); // => 0
11. w จࣈྻΛೖྗͨ͠৔߹
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    w ແҙຯͳೖྗ͔Β͸ແҙຯͳ݁Ռ͕ಘΒΕΔ
12. Ҿ਺ΛνΣοΫͯ͠ΈΔ
13. class CalculateException extends Exception {} class Calculator { public static function pow3($n) { if (!is_int($n)) { throw new CalculateException; } return $n ** 3; } } try { print Calculator::pow3('string'); } catch (CalculateException $e) { print 'Exception!!!'; } // => 'Exception!!!'
14. w Ҿ਺૿͑ͨͱ͖ʹՄಡੑ͕Լ͕Δ
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 ͷରॲ๏Ͱ͸ͳ͍ͷͰ͸ʁ
    w ෆਖ਼ͳೖྗ͸ͦ΋ͦ΋ड͚෇͚ͳ͍Α͏ʹ͍ͨ͠
15. ͦ͜Ͱܕએݴ
16. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3(3); } catch (TypeError $e) { print "TypeError!"; } // => 27
17. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3("string"); } catch (TypeError $e) { print "TypeError!"; } // => "TypeError!"
18. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3("3"); } catch (TypeError $e) { print "TypeError!"; } // ???
19. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3("3"); } catch (TypeError $e) { print "TypeError!"; } // => 27
20. declare(strict_types=1); class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3("3"); } catch (TypeError $e) { print "TypeError!"; } // => "TypeError!" SF ☺
21. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3(null); } catch (TypeError $e) { print "TypeError!"; } // ???
22. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3(null); } catch (TypeError $e) { print "TypeError!"; } // => "TypeError!"
23. class Calculator { public static function pow3(?int $n) : int { return $n ** 3; } } try { print Calculator::pow3(null); } catch (TypeError $e) { print "TypeError!"; } // => 0 OVMMBCMF
24. w ܕએݴͰೖग़ྗΛ੍ݶ͢Δ
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    w ձࣾͷຊ୨ʹ͋Γ·͢
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26. ·ͱΊ
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