PHP7.2で始める型宣言 // Type declaration with PHP 7.2

2017/12/06 社内テックミーティング

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5. class Calculator { public static function pow3(int $n) : int { return $n ** 3; } } try { print Calculator::pow3(3); } catch (TypeError $e) { print "TypeError!"; } // => 27
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8. class Calculator { public static function pow3($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 $n ** 3; } } print Calculator::pow3("string"); // => 0
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13. class CalculateException extends Exception {} class Calculator { public static function pow3($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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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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