PHP7.2で始める型宣言

Transcript

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4. 
   
   
   
   
   
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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

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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!!!'

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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

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