Readonly Properties ?

,FJUB)PSJLBXB 3FBEPOMZ1SPQFSUJFT 1)15FDI$BGF

3FBEPOMZ1SPQFSUJFTͬͯʁ w ม਺ͷॳظԽޙʹ஋Λมߋ͢Δ͜ͱΛې͡ΔϓϩύςΟ w ஋ΦϒδΣΫτͱσʔλసૹΦϒδΣΫτͷϞσϧԽʹ໾ཱͭ

class User { public function __construct ʢ private string $
name ʣ { } public function getName ʢʣɿ string { return $ this- > name ; } } ͜Ε·Ͱ w QSJWBUFͳม਺એݴͱQVCMJDͳHFUUFSͷ૊Έ߹Θͤ w ❌ಡΈऔΓઐ༻ɹ⭕มߋ͕ൃੜ͢ΔՄೳੑͷ͋ΔൣғΛ୯ҰΫϥεʹ

class Test { public readonly string $prop; public function
__construct(string $prop) { // ॳظԽ . $this->prop = $prop; } } $test = new Test(“foobar") ; // ಡΈࠐΈ͸OK . var_dump($test->prop); // string(6) "foobar " // ஋ͷ্ॻ͖͸NG. ୅ೖ͢Δ஋͕ಉ͔͡Ͳ͏͔͸ؔ܎ແ͍ . $test->prop = "foobar"; // Error: Cannot modify readonly property Test::$pro p 3FBEPOMZ1SPQFSUJFTΛ࢖͏ͱ w Ұ౓͚ͩม਺ͷείʔϓ͔ΒͷॳظԽΛڐՄ ɹɹɹɹɹɹɹɹɹɹ↪︎Ϋϥεͷ֎͔ΒͷॳظԽ͸ڐ͞Εͳ͍

੍ݶ w ఆٛ࣌ʹσϑΥϧτ஋Λ࣋ͯͳ͍ w SFBEPOMZͷ෇͚֎͠Λ൐͏ΦʔόʔϥΠυͷېࢭ w ॳظԽޙͷVOTFU ͷېࢭ w ॳظԽલ͸Մೳ
w ௨ৗͷϓϩύςΟͷΑ͏ʹϚδοΫϝιου౳͕൓Ԡ

ؔ਺ w 3F fl FDUJPO1SPQFSUZJT3FBE0OMZ ͷ௥Ճ   ϓϩύςΟ͕SFBEPOMZ͔൱͔Λ֬ೝ w 3F
fl FDUJPO1SPQFSUZHFU.PEJ fi FST   ͕3F fl FDUJPO1SPQFSUZ*4@3&"%0/-:ϑϥάΛฦ͢Α͏ʹ w 3F fl FDUJPO1SPQFSUZTFU7BMVF   Ͱಉ͡είʔϓ͔Β͔͠ॳظԽͰ͖ͳ͍ͱ͍͏੍ݶΛճආ͠ɺॳظԽՄೳ   ౰વطʹॳظԽ͞ΕͨϓϩύςΟ͸มߋෆՄ

࣭໰

+BWBΛ৮ͬͨ͜ͱ͸͋Γ·͔͢ʁ

ࣗݾ঺հ ງ઒ܚଠ w ৽ଔ೥໨ w େࡕࡏॅେࡕۈ຿ w 1)1ྺ൒೥଍Βͣ w ಈతϓϩύςΟͷېࢭ͕ؾʹͳΔ

ͳΜͰGJOBM͡Όͳ͍ʁ

+BWBͱ1)1ͷൺֱ +BWB 1)1 ޮՌ Ϋϥε fi OBM fi OBM ܧঝͷېࢭ
ϝιου fi OBM fi OBM ΦʔόϥΠυͷېࢭ ม਺ fi OBM SFBEPOMZ ࠶୅ೖͷېࢭ

3FBEPOMZ1SPQFSUJFT࣮૷·ͰͷྲྀΕ ࠷ॳ͔Β fi OBM͡Όͳ͍ 8SJUF0ODF1SPQFSUJFTͷ3'$͕ఏҊ͞ΕΔ ౤ථ݁ՌରͰՄܾ͞Εͣ ౤ථ૯਺ͷͷࢍ੒͕ඞཁ ಉ࣌ʹΩʔϫʔυ౤ථ͕ߦΘΕɺSFBEPOMZʹ΄΅શථ͕ू·Δ 3FBE0OMZ1SPQFSUJFTͷ3'$͕ఏҊ͞ΕΔ

3FBEPOMZ1SPQFSUJFT࣮૷·ͰͷྲྀΕ ࠷ॳ͔Β fi OBM͡Όͳ͍ ౤ථ݁ՌରͰՄܾ 1)1Ͱ࣮૷ʂ

ͳΜͰGJOBM͡Όͳ͍ Ωʔϫʔυ౤ථͷ݁Ռ IUUQTXJLJQIQOFUSGDXSJUF@PODF@QSPQFSUJFTΑΓ Ωʔϫʔυ JNNVUBCMF MPDLFE XSJUFPODF SFBEPOMZ ౤ථ݁Ռ

ͳΜͰGJOBM͡Όͳ͍ HJUIVCϓϧϦΫΤετͷDPOWFSTBUJPO IUUQTHJUIVCDPNQIQQIQTSDQVMMΑΓ Ωʔϫʔυ͸ fi OBM͕͍͍ͱࢥ͏ʂ +BWBͰ΋࢖ΘΕ͍ͯΔ͠ɺҰ؏ੑͷ؍఺͔Βݟͯ΋ద੾ͩΑͶʂ 1)1ݴޠ։ൃऀ LPDTJTNBUF fi
OBM͸͋Γಘͳ͍Αɻ 1)1Ͱ͸ݱࡏ fi OBM͸ΫϥεͱϝιουͷΦʔόʔϥΠυΛ๷͙Ωʔϫʔυɻ ʮෆมʯͷҙຯΛ࣋ͭϓϩύςΟʹ࢖༻͢Δͷ͸ؒҧ͍ͩΑɻ

ͳΜͰGJOBM͡Όͳ͍ ࠓճͷ݁࿦ +BWB 1)1 ޮՌ Ϋϥε fi OBM fi OBM
ܧঝͷېࢭ ϝιου fi OBM fi OBM ΦʔόϥΠυͷېࢭ ม਺ fi OBM SFBEPOMZ ࠶୅ೖͷېࢭ ܧঝΛ๷͙ ஋ͷ࠶มߋΛ๷͙

·ͱΊ 3FBE0OMZ1SPQFSUJFT w ॳظԽޙͷมߋΛ๷͙ϓϩύςΟ w ఆ਺༻ͱ͍͏ΑΓ͸ड͚औͬͨ஋ͷมߋΛ๷͙ͱ͍͏࢖͍ํ w fi OBMʹͳΔՄೳੑ͸શ͘ͱݴͬͯແ͔ͬͨ w
ࠓճͷ৽ػೳͷதͰ͸ൺֱతऔΓೖΕ΍͍͢෦ྨ

ࢀߟαΠτ w 1)1SFMFBTF<IUUQTXXXQIQOFUSFMFBTFTFOQIQ> w 3'$3FBE0OMZ1SPQFSUJFT<IUUQTXJLJQIQOFUSGD SFBEPOMZ@QSPQFSUJFT@W> w *NQMFNFOUSFBEPOMZQSPQFSUJFT<IUUQTHJUIVCDPNQIQQIQTSDQVMM > w
"EETVQQPSUGPSlXSJUFPODFzQSPQFSUJFT<IUUQTHJUIVCDPNQIQ QIQTSDQVMM>

Readonly Properties ?

Readonly Properties ?

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,FJUB)PSJLBXB 3FBEPOMZ1SPQFSUJFT 1)15FDI$BGF

3FBEPOMZ1SPQFSUJFTͬͯʁ w ม਺ͷॳظԽޙʹ஋Λมߋ͢Δ͜ͱΛې͡ΔϓϩύςΟ w ஋ΦϒδΣΫτͱσʔλసૹΦϒδΣΫτͷϞσϧԽʹ໾ཱͭ

class User { public function __construct ʢ private string $

class Test { public readonly string $prop; public function

੍ݶ w ఆٛ࣌ʹσϑΥϧτ஋Λ࣋ͯͳ͍ w SFBEPOMZͷ෇͚֎͠Λ൐͏ΦʔόʔϥΠυͷېࢭ w ॳظԽޙͷVOTFU ͷېࢭ w ॳظԽલ͸Մೳ

ؔ਺ w 3F fl FDUJPO1SPQFSUZJT3FBE0OMZ ͷ௥Ճ   ϓϩύςΟ͕SFBEPOMZ͔൱͔Λ֬ೝ w 3F

࣭໰

+BWBΛ৮ͬͨ͜ͱ͸͋Γ·͔͢ʁ

ࣗݾ঺հ ງ઒ܚଠ w ৽ଔ೥໨ w େࡕࡏॅେࡕۈ຿ w 1)1ྺ൒೥଍Βͣ w ಈతϓϩύςΟͷېࢭ͕ؾʹͳΔ

ͳΜͰGJOBM͡Όͳ͍ʁ

+BWBͱ1)1ͷൺֱ +BWB 1)1 ޮՌ Ϋϥε fi OBM fi OBM ܧঝͷېࢭ

3FBEPOMZ1SPQFSUJFT࣮૷·ͰͷྲྀΕ ࠷ॳ͔Β fi OBM͡Όͳ͍ 8SJUF0ODF1SPQFSUJFTͷ3'$͕ఏҊ͞ΕΔ ౤ථ݁ՌରͰՄܾ͞Εͣ ౤ථ૯਺ͷͷࢍ੒͕ඞཁ ಉ࣌ʹΩʔϫʔυ౤ථ͕ߦΘΕɺSFBEPOMZʹ΄΅શථ͕ू·Δ 3FBE0OMZ1SPQFSUJFTͷ3'$͕ఏҊ͞ΕΔ

3FBEPOMZ1SPQFSUJFT࣮૷·ͰͷྲྀΕ ࠷ॳ͔Β fi OBM͡Όͳ͍ ౤ථ݁ՌରͰՄܾ 1)1Ͱ࣮૷ʂ

ͳΜͰGJOBM͡Όͳ͍ Ωʔϫʔυ౤ථͷ݁Ռ IUUQTXJLJQIQOFUSGDXSJUF@PODF@QSPQFSUJFTΑΓ Ωʔϫʔυ JNNVUBCMF MPDLFE XSJUFPODF SFBEPOMZ ౤ථ݁Ռ

ͳΜͰGJOBM͡Όͳ͍ HJUIVCϓϧϦΫΤετͷDPOWFSTBUJPO IUUQTHJUIVCDPNQIQQIQTSDQVMMΑΓ Ωʔϫʔυ͸ fi OBM͕͍͍ͱࢥ͏ʂ +BWBͰ΋࢖ΘΕ͍ͯΔ͠ɺҰ؏ੑͷ؍఺͔Βݟͯ΋ద੾ͩΑͶʂ 1)1ݴޠ։ൃऀ LPDTJTNBUF fi

ͳΜͰGJOBM͡Όͳ͍ ࠓճͷ݁࿦ +BWB 1)1 ޮՌ Ϋϥε fi OBM fi OBM

·ͱΊ 3FBE0OMZ1SPQFSUJFT w ॳظԽޙͷมߋΛ๷͙ϓϩύςΟ w ఆ਺༻ͱ͍͏ΑΓ͸ड͚औͬͨ஋ͷมߋΛ๷͙ͱ͍͏࢖͍ํ w fi OBMʹͳΔՄೳੑ͸શ͘ͱݴͬͯແ͔ͬͨ w

ࢀߟαΠτ w 1)1SFMFBTF<IUUQTXXXQIQOFUSFMFBTFTFOQIQ> w 3'$3FBE0OMZ1SPQFSUJFT<IUUQTXJLJQIQOFUSGD SFBEPOMZ@QSPQFSUJFT@W> w *NQMFNFOUSFBEPOMZQSPQFSUJFT<IUUQTHJUIVCDPNQIQQIQTSDQVMM > w