PHP7.2で始める型宣言

Talked in EC Tech Meeting in GMO Pepabo inc

Transcript

1. 1)1Ͱ࢝ΊΔܕએݴ 
   &$
   5&$)
   .&&5*/(
 !SBWFMMM
2. w ࣾ಺Ͱ
   1)1
   Y
   ͷػӡ͕ͲΜͲΜߴ·͍ͬͯ·͢
   w ॲཧ͕ߴ଎Խ͢Δ͚ͩͰͳ͘ɺͰ͖Δ͜ͱ͕૿͑·͢
   w ͦͷதͰ΋ɺ1)1
   
   ͔Β෇͖߹͍ํ͕มΘΔɾม͑Δ ͱྑ͍֓೦͕͋Γ·͢
   w ߴ඼࣭ͳιϑτ΢ΣΞΛ࡞Γ͍ͨɺ1)1
   
   Ͱɻ
3. w ൃදͷ಺༰Λ͖ͬͪΓ֮͑Δඞཁ͸ͳ͍Ͱ͢
   w ͜ͷ৔ʹ͍Δਓ͕কདྷ
   1)1
   
   ͷίʔυΛॻ͘ͱ͖ʹ
 ʮͦ͏͍͑͹͍͋͋͏ػೳ͕͋ͬͨؾ͕͢Δʯͱ
 ࢥ͍ग़ͯ͠΋Β͑Ε͹े෼
   w ػೳͷ࢖͍ํ͸ௐ΂ΒΕΔ͚Ͳ
 ػೳͷଘࡏ͸ೳಈతʹ௥ͬͯΔਓҎ֎ؾ͚ͮͳ͍
4. 
   
   
   
   
   
   ࠓճઆ໌͢Δػೳɿܕએݴ
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
   w ݹ͘͸λΠϓώϯςΟϯάͱ΋
   w ϝιου΍ؔ਺ͷҾ਺ɾฦΓ஋ͷܕΛࢦఆ͢Δػೳ
   w 1)1
   
   ͔Βଘࡏ͕ͨ͠ɺόʔδϣϯ্͕͕ΔʹͭΕɺ
 ΑΓଟ͘ͷܕ͕ࢦఆͰ͖ΔΑ͏ʹͳͬͨ
   w ֤όʔδϣϯͰࢦఆͰ͖Δܕʹ͍ͭͯ͸
 υΩϡϝϯτ˞ʹॻ͍ͯ͋Γ·͢ ˞
   IUUQQIQOFUNBOVBMKBGVODUJPOTBSHVNFOUTQIQGVODUJPOTBSHVNFOUTUZQFEFDMBSBUJPO
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 $n ** 3; } } print Calculator::pow3("string"); // => 0
11. w จࣈྻΛೖྗͨ͠৔߹
    w ֘౰ͷϝιουͰ͸ΤϥʔʹͳΒͳ͍͕ɺ
 ͦ΋ͦ΋๬·͍͠ೖྗͰ͸ͳ͘ɺ݁Ռͷ͸ແҙຯ
    w ଓ͘ॲཧͰΤϥʔʹͳͬͨͱ͖ɺσόοά͕ࠔ೉ʹ
    w (BSCBHF
    JO
    HBSCBHF
    PVU
    w ແҙຯͳೖྗ͔Β͸ແҙຯͳ݁Ռ͕ಘΒΕΔ
12. Ҿ਺ΛνΣοΫͯ͠ΈΔ
13. class CalculateException extends Exception {} class Calculator { public static function pow3($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
    w &YDFQUJPO
    ͸༧૝͞ΕΔΤϥʔ΁ͷରॲ๏Ͱ͋ͬͯɺ
 ͋ͬͯ͸ͳΒͳ͍ࣄ৅ ࠓճͷ৔߹ͩͱจࣈྻΛೖྗ͢Δ͜ͱ 
 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
    w ؒҧͬͨ࢖͍ํ͕Ͱ͖ͳ͍Α͏ʹ͢Δ
    w ๷ޚతϓϩάϥϛϯάͷख๏
    w ࢖͍खʹաࣦ͕͋ͬͯ΋ඃ֐͕ٴ͹ͳ͍Α͏ʹ͢Δ
    w OP
    HBSCBHF
    BMMPXFE
    JO
    w ͱ͍͏Α͏ͳ͜ͱ͕
    $PEF
    $PNQMFUF
    ʹॻ͔ΕͯΔ
    w ձࣾͷຊ୨ʹ͋Γ·͢
25. IUUQTTQFBLFSEFDLDPNUXBEBQIQDPOGFSFODF ΑΓ࣮ફతͳ಺༰͸
    U@XBEB
    ͞ΜͷεϥΠυΛಡΈ·͠ΐ͏
26. ·ͱΊ
    w 1)1
    
    ʹ͸ܕએݴͱ͍͏ػೳ͕͋Δ
    w ܕએݴΛ࢖͏͜ͱͰϝιουͷҾ਺ɾฦΓ஋ͷܕΛࢦఆͰ͖Δ
    w ೖྗΛ੍ݶ͢Δ͜ͱͰ࢖͍ख͕ؒҧ͑Δ͜ͱΛࠔ೉ʹͰ͖Δ