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PHP7.2で始める型宣言
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Yoshihide Taniguchi
December 06, 2017
Programming
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490
PHP7.2で始める型宣言
Talked in EC Tech Meeting in GMO Pepabo inc
Yoshihide Taniguchi
December 06, 2017
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Transcript
1)1Ͱ࢝ΊΔܕએݴ &$5&$).&&5*/( !SBWFMMM
w ࣾͰ1)1Yͷػӡ͕ͲΜͲΜߴ·͍ͬͯ·͢ w ॲཧ͕ߴԽ͢Δ͚ͩͰͳ͘ɺͰ͖Δ͜ͱ͕૿͑·͢ w ͦͷதͰɺ1)1͔Β͖߹͍ํ͕มΘΔɾม͑Δ ͱྑ͍֓೦͕͋Γ·͢ w ߴ࣭ͳιϑτΣΞΛ࡞Γ͍ͨɺ1)1Ͱɻ
w ൃදͷ༰Λ͖ͬͪΓ֮͑Δඞཁͳ͍Ͱ͢ w ͜ͷʹ͍Δਓ͕কདྷ1)1ͷίʔυΛॻ͘ͱ͖ʹ ʮͦ͏͍͍͑͋͋͏ػೳ͕͋ͬͨؾ͕͢Δʯͱ ࢥ͍ग़ͯ͠Β͑Εे w ػೳͷ͍ํௐΒΕΔ͚Ͳ ػೳͷଘࡏೳಈతʹͬͯΔਓҎ֎ؾ͚ͮͳ͍
ࠓճઆ໌͢Δػೳɿܕએݴ
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3(3); } catch (TypeError $e) { print "TypeError!"; } // => 27
ܕએݴ w ݹ͘λΠϓώϯςΟϯάͱ w ϝιουؔͷҾɾฦΓͷܕΛࢦఆ͢Δػೳ w 1)1͔Βଘࡏ͕ͨ͠ɺόʔδϣϯ্͕͕ΔʹͭΕɺ ΑΓଟ͘ͷܕ͕ࢦఆͰ͖ΔΑ͏ʹͳͬͨ w ֤όʔδϣϯͰࢦఆͰ͖Δܕʹ͍ͭͯ
υΩϡϝϯτ˞ʹॻ͍ͯ͋Γ·͢ ˞IUUQQIQOFUNBOVBMKBGVODUJPOTBSHVNFOUTQIQGVODUJPOTBSHVNFOUTUZQFEFDMBSBUJPO
ܕએݴͷແ͍࣮
class Calculator { public static function pow3($n) { return $n
** 3; } } print Calculator::pow3(3); // => 27
class Calculator { public static function pow3($n) { return $n
** 3; } } print Calculator::pow3("string"); // ???
class Calculator { public static function pow3($n) { return $n
** 3; } } print Calculator::pow3("string"); // => 0
w จࣈྻΛೖྗͨ͠߹ w ֘ͷϝιουͰΤϥʔʹͳΒͳ͍͕ɺ ͦͦ·͍͠ೖྗͰͳ͘ɺ݁Ռͷແҙຯ w ଓ͘ॲཧͰΤϥʔʹͳͬͨͱ͖ɺσόοά͕ࠔʹ w (BSCBHFJO HBSCBHFPVU
w ແҙຯͳೖྗ͔Βແҙຯͳ݁Ռ͕ಘΒΕΔ
ҾΛνΣοΫͯ͠ΈΔ
class CalculateException extends Exception {} class Calculator { public static
function pow3($n) { if (!is_int($n)) { throw new CalculateException; } return $n ** 3; } } try { print Calculator::pow3('string'); } catch (CalculateException $e) { print 'Exception!!!'; } // => 'Exception!!!'
w Ҿ૿͑ͨͱ͖ʹՄಡੑ͕Լ͕Δ w &YDFQUJPO༧͞ΕΔΤϥʔͷରॲ๏Ͱ͋ͬͯɺ ͋ͬͯͳΒͳ͍ࣄ ࠓճͷ߹ͩͱจࣈྻΛೖྗ͢Δ͜ͱ ͷରॲ๏Ͱͳ͍ͷͰʁ w ෆਖ਼ͳೖྗͦͦड͚͚ͳ͍Α͏ʹ͍ͨ͠
ͦ͜Ͱܕએݴ
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3(3); } catch (TypeError $e) { print "TypeError!"; } // => 27
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3("string"); } catch (TypeError $e) { print "TypeError!"; } // => "TypeError!"
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3("3"); } catch (TypeError $e) { print "TypeError!"; } // ???
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3("3"); } catch (TypeError $e) { print "TypeError!"; } // => 27
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 ☺
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3(null); } catch (TypeError $e) { print "TypeError!"; } // ???
class Calculator { public static function pow3(int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3(null); } catch (TypeError $e) { print "TypeError!"; } // => "TypeError!"
class Calculator { public static function pow3(?int $n) : int
{ return $n ** 3; } } try { print Calculator::pow3(null); } catch (TypeError $e) { print "TypeError!"; } // => 0 OVMMBCMF
w ܕએݴͰೖग़ྗΛ੍ݶ͢Δ w ؒҧ͍ͬͨํ͕Ͱ͖ͳ͍Α͏ʹ͢Δ w ޚతϓϩάϥϛϯάͷख๏ w ͍खʹաࣦ͕͋ͬͯඃ͕ٴͳ͍Α͏ʹ͢Δ w OPHBSCBHFBMMPXFEJO
w ͱ͍͏Α͏ͳ͜ͱ͕$PEF$PNQMFUFʹॻ͔ΕͯΔ w ձࣾͷຊ୨ʹ͋Γ·͢
IUUQTTQFBLFSEFDLDPNUXBEBQIQDPOGFSFODF ΑΓ࣮ફతͳ༰U@XBEB͞ΜͷεϥΠυΛಡΈ·͠ΐ͏
·ͱΊ w 1)1ʹܕએݴͱ͍͏ػೳ͕͋Δ w ܕએݴΛ͏͜ͱͰϝιουͷҾɾฦΓͷܕΛࢦఆͰ͖Δ w ೖྗΛ੍ݶ͢Δ͜ͱͰ͍ख͕ؒҧ͑Δ͜ͱΛࠔʹͰ͖Δ