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PHPのimmutable arrayとは
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hnw
January 25, 2023
Technology
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PHPのimmutable arrayとは
Quite Night 〜PHP〜 (2023/01/25) 発表資料
hnw
January 25, 2023
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Transcript
What are immutable arrays in PHP 1)1ͷJNNVUBCMF BSSBZͱ 2VJUF/JHIUʙ1)1ʙ
ൃදࢿྉ !IOX
ࣗݾհ ❖ !IOX ❖ ॴଐɿ,-BCגࣜձࣾ ❖ 8FBSFIJSJOH ❖ 1)1ຊମͷ$ιʔείʔυΛಡΉͷ͕झຯ ❖
1)1ຊମͷόάΛ݅ใࠂ
ࣗݾհ 1)1FS,BJHJ 1)1ΧϯϑΝϨϯεؔ
ຊϓϨθϯͷΰʔϧ *NNVUBCMFBSSBZͷΛ௨ͯ͡ Έͳ͞Μ͕1)1ͷ෦࣮ʹڵຯΛ࣋ͭ
*NNVUBCMFʢϓϩάϥϛϯά༻ޠʣ ͬͯ͝ଘͰ͠ΐ͏͔
*NNVUBCMFͱ ❖ ʮͷมߋ͕Ͱ͖ͳ͍ʯͷҙຯ ❖ ྫɿ1ZUIPOͷUVQMF ❖ JNNVUBCMFͳσʔλߏ ❖ ҙݸͷఆͷΛදݱ͢Δ ❖
ཁૉͷॻ͖͑ɾՃɾআͰ͖ͳ͍
1)1ͷJNNVUBCMFBSSBZͱ ❖ 1)1ͷݴޠ্༷ͷ֓೦Ͱͳ͍ ❖ ެࣜϚχϡΞϧʹొ͠ͳ͍ ❖ શΩʔɾશཁૉ͕ϦςϥϧͰ͋Δྻͷ෦্࣮ͷ໊લ ❖ 1)1ͷߴԽϓϩδΣΫτͰJNNVUBCMFBSSBZʹಛԽ ͨ͠࠷దԽ͕࣮͞Εͨ
1)1ͷΒΕ͟Δੑೳվળ ❖ ϨίʔυɺΧϥϜͷ࣍ݩྻΛฦ͢ྫ <?php function foo() { return [ "x1"=>["foo"=>1,"bar"=>2/*
(ུ) */,"thud"=>13], "x2"=>["foo"=>1,"bar"=>2/* (ུ) */,"thud"=>13], /* 30000ߦলུ */ "x30000"=>["foo"=>1,"bar"=>2/* (ུ) */,"thud"=>13], ]; } foo();
1)1ͷΒΕ͟Δੑೳվળ ❖ 1)1ͱൺͯ1)1ஈҧ͍ʹ͍
1)1ͷΒΕ͟Δੑೳվળ ❖ 01DBDIF֦ுͳͩ͠ͱࠩഒఔ
͜Ε΄Ͳͷ͕ࠩ ͳͥੜ·ΕΔͷ͔ʁ
1)1Ͳ͏࣮ߦ͞Ε͍ͯΔ͔ʁ ❖ 1)1εΫϦϓτͦͷ··Ͱ࣮ߦͰ͖ͳ͍ ❖ PQDPEFྻʹίϯύΠϧͯ͠;FOE7.্Ͱ࣮ߦ͢Δ ίϯύΠϧॲཧ 7.࣮ߦ PQDPEF 1)1
;FOE7.ͱ ❖ PQDPEFʢ7.໋ྩʣΛ࣮ߦ͢ΔԾ$16࣮ ❖ ೋஈߏ͑ͷ࣮ ❖ εΫϦϓτݴޠ͔ΒPQDPEFͷมث ❖ PQDPEFͷ࣮ߦث
1)1Ͳ͏࣮ߦ͞Ε͍ͯΔ͔ʁ ❖ 01DBDIFPQDPEFΛΩϟογϡ͢Δ ❖ ճҎ߱ͷ࣮ߦ࣌ʹίϯύΠϧॲཧΛεΩοϓͰ͖Δ ίϯύΠϧॲཧ 7.࣮ߦ ࠷దԽ PQDPEF
PQDPEF Ωϟογϡ PQDPEF 1)1
௨ৗͷྻߏங ❖ ௨ৗɺྻߏஙPQDPEFྻʹίϯύΠϧ͞ΕΔ ❖ ʮྻʹཁૉΛՃ͢Δʯ͕ݸͷPQDPEF ❖ ສཁૉͷྻͳΒ7.໋ྩΛສճ࣮ߦ 1)1ϓϩηε ڞ༗ϝϞϦ ʢ01DBDIFཧʣ
ྻߏஙͷPQDPEF ʜ ྻͷ࣮ମ ྻߏங
1)1ͷJNNVUBCMFBSSBZ ❖ 1)1ͰJNNVUBCMFBSSBZͷ࣮ମ͕Ωϟογϡର ❖ 7.໋ྩΛ࣮ߦͤͣʹߏஙࡁΈྻʹΞΫηεͰ͖Δ ڞ༗ϝϞϦ ʢ01DBDIFཧʣ ྻͷ࣮ମ 1)1ϓϩηε ෆมྻͷΞΫηε
1)1ͷJNNVUBCMFBSSBZ ❖ 1)1ͰJNNVUBCMFBSSBZͷ࣮ମ͕Ωϟογϡର ❖ ϓϩηεؒͰ࣮ମΛڞ༗Ͱ͖ΔͷͰলϝϞϦ ڞ༗ϝϞϦ ʢ01DBDIFཧʣ ྻͷ࣮ମ 1)1ϓϩηε 1)1ϓϩηε
1)1ϓϩηε
·ͱΊ ❖ ࠷ۙͷ1)1ͩͱJNNVUBCMFBSSBZߴɾলϝϞϦ ❖ શΩʔɾશཁૉ͕ϦςϥϧͷྻʹಛԽͨ͠࠷దԽ ❖ ྻͷ࣮ମ͕01DBDIFͷΩϟογϡର ❖ શ1)1ϓϩηεͰಉ࣮͡ମΛڞ༗ ❖
1)1ͷ෦࣮ʹڵຯΛ࣋ͬͯΒ͑ͨΒخ͍͠Ͱ͢ ❖ 4MBDLάϧʔϓQIQVTFSTKBͰօ͞ΜϚχΞοΫͳΛ ͯͨ͠Γ͠·͢ɺ͓קΊͰ͢ʢṖͷએʣ
͝੩ௌ ͋Γ͕ͱ͏ ͍͟͝·ͨ͠
೦ͷͨΊҙ ❖ ͜ͷखͷੑೳൺֱΛਅʹड͚͗͢ͳ͍ͰԼ͍͞😉 ❖ ϘτϧωοΫҎ֎Λͯ͘͠શମͷӨڹܰඍ ❖ େͷݱͰੑೳΑΓอकੑ͕େࣄ
ิςετڥͷৄࡉ ❖ .BDNJOJ ❖ 04NBD04.PKBWF ❖ $16()[*OUFM$PSFJ ❖
NFNPSZ(# ❖ OHJOY QIQGQN
201DBDIF༗ޮͰॳճΞΫηε࣌ॏ͍ΑͶʁ ❖ :FT ❖ ॳճΞΫηεͩͱίϯύΠϧॲཧ͔ΒΔͷͰɺྻߏ ங͢ΔͷʹཁૉͷPQDPEF࣮ߦ͕ඞཁͰ͢ ❖ ॳճΞΫηε࣌ʹߏஙͨ͠ྻͷ࣮ମ͕Ωϟογϡ͞Ε ͯճҎ͍߱·Θ͞Ε·͢
21)1ͷྻશ෦Ωϟογϡରʁ ❖ Ωʔ͔ʹͭͰม͕ೖ͍ͬͯͨΒPQDPEFྻʹί ϯύΠϧ͞ΕͯෆมྻͷԸܙड͚ΒΕ·ͤΜ ❖ ڊେྻͳΜ͚ͩͲෆม͡Όͳ͍߹ɺෆม෦͚ͩ ผྻʹΓग़͢ͱੑೳվળʹͳΔՄೳੑ͕͋Γ·͢
2ෆมྻΛॻ͖͑ͨΒͲ͏ͳΔʁ ❖ ίϐʔΦϯϥΠτʹΑΓίϐʔ͞Εͯॻ͖ΘΓ·͢ ❖ ෆมʹڞ༗ϝϞϦ্ͷΩϟογϡͷѻ͍ ❖ ϓϩάϥϚઢͰͷ͍উखԿมΘΒͳ͍