20年ものの巨大レガシープロダクトを PHP 8.0にアップデートした際の対策と得られた知見

1)1$POGFSFODF+BQBO ೥΋ͷͷڊେϨΨγʔϓϩμΫτΛ 1)1ʹΞοϓσʔτͨ͠ࡍͷରࡦͱಘΒΕͨ஌ݟ αΠϘ΢ζגࣜձࣾ ੺ؒਔࢤ

1)1ͷ&0-͸΋͏͙͢ʂ w 1)1ͷηΩϡϦςΟमਖ਼ͷఏڙ͸·Ͱ IUUQTXXXQIQOFUTVQQPSUFEWFSTJPOTQIQ ŘŵŠŠʂ

1)1ͷ&0-͸΋͏͙͢ʂ w 1)1ͷηΩϡϦςΟमਖ਼ͷఏڙ͸·Ͱ IUUQTXXXQIQOFUTVQQPSUFEWFSTJPOTQIQ ŘŵŠŠʂ 1)1ܥʹΞοϓσʔτ͠Α͏ʂ

ࣗݾ঺հ w ੺ؒਔࢤ ͔͋·ͻͱ͠ ग़਎஍ɿౡࠜݝদߐࢢ झຯ͸ϓϥϨʔϧͰܭࢉ͢Δ͜ͱ w
αΠϘ΢ζגࣜձࣾʹ೥৽ଔೖࣾ (BSPPO։ൃνʔϜʹॴଐ w 1)1ྺ͸ʙ೥͘Β͍ ϓϥϨʔϧCJUΧ΢ϯλ

ຊηογϣϯͷ֓ཁ w ϨΨγʔϓϩμΫτͷ1)1ͷόʔδϣϯΛ͔Βʹߋ৽͠·ͨ͠ ؙҰ೥͔͔Γ·ͨ͠ େ͖ͳτϥϒϧͳ͘׬਱Ͱ͖·ͨ͠ w Ͳ͏͍ͬͨ՝୊͕͋ΓɺͲͷΑ͏ͳରࡦΛͱ͔ͬͨΛڞ༗͠·͢
ͱʹ͔͘ޓ׵ੑʹ·ͭΘΔ໰୊Λૣظൃݟ͢Δ͜ͱ͕ॏཁ

ΞδΣϯμ w എܠ w ϦϦʔεαΠΫϧͱϒϥϯνઓུ w ൺֱԋࢉࢠͷରࡦ w ઈົʹڍಈ͕มΘΔඪ४ϥΠϒϥϦؔ਺ w
·ͱΊ

αΠϘ΢ζͷ(BSPPOʹ͍ͭͯ w தن໛ʙେن໛ͳ૊৫޲͚ͷάϧʔϓ΢ΣΞ ༧ఆڞ༗ɺίϛϡχέʔγϣϯͳͲɺ૊৫ͷνʔϜϫʔΫΛࢧԉ w DZCP[VDPN͕ఏڙ͢ΔΫϥ΢υ൛ͱɺΦϯϓϨ൛Λఏڙ w ࠓ೥Ͱఏڙ։͔࢝Βप೥ʢΫϥ΢υ൛͸೥͔Βʣ w
όοΫΤϯυ͸1)1 .Z42- ಠࣗϑϨʔϜϫʔΫ

(BSPPOͷ։ൃঢ়گ w 1)1ͷ࣌୅͔Β೥ଓ͘఻౷ͷιʔείʔυ SFRVJSF@PODFɺԋࢉࢠΛଟ༻ɻݹ͍ίʔυͷՄಡੑ͕௿͍ w ௒ڊେͳίʔυϕʔεʢ1)1͚ͩͰ໿ສߦʣ w ϢχοτςετͷΧόϨοδ͸໿
ίʔυͷอक͚ͩͰ΋ෛ୲͕େ͖͍

1)1ຊମͷϏϧυ w (BSPPOͰ͸1)1ຊମΛࣗલͰϏϧυ͍ͯ͠Δ w (BSPPOಠࣗͷ1)1֦ு͕͋Δʢ$ݴޠͰॻ͔Ε͍ͯΔʣ w 1)1ຊମͷίʔυΛվ଄͍ͯ͠Δ ύονϑΝΠϧͱͯ͠վ଄ՕॴΛϦϙδτϦʹ഑ஔ
1)1ͷϏϧυपΓ΋(BSPPOͷ։ൃʹؚ·ΕΔ

1)1Ξοϓσʔτͷಈػ ηΩϡϦςΟ άϧʔϓ΢ΣΞ͸ར༻ऀͷϏδωεʹ௚݁͢Δ ৗʹηΩϡϦςΟमਖ਼ΛऔΓࠐΊΔঢ়ଶʹ͢Δ ࠷৽ͷݴޠػೳΛར༻ͨ͠։ൃޮ཰ͷ޲্
҆શʹ࢖͍ଓ͚͍ͯͨͩͨ͘Ίʹɺ΍Βͳ͚Ε͹ͳΒͳ͍

(BSPPOʹ͓͚Δ1)1Ξοϓσʔτ w ೥ʹҰ౓ɺ1)1ͷϦϦʔεαΠΫϧΑΓগʑ஗Ε࣮ͯࢪ ೥݄ɿˠ w ϦϦʔε࣌͸1)1ΞοϓσʔτҎ֎ͷมߋΛۃྗ͠ͳ͍ w ຊ൪؀ڥ΁ͷద༻લʹɺαΠϘ΢ζࣾ಺ͰҰϲ݄΄Ͳӡ༻͢Δ
1)1ͷΞοϓσʔτʹ͸༷ʑͳߟྀ͕ඞཁ

Ϗδωεཁ݅ͱͷંΓ߹͍ w Ϋϥ΢υ൛ͷϦϦʔε͸݄Ұͷఀࢭϝϯςφϯε࣌ͷΈՄೳ ͦΕҎ֎ͷఀࢭ͸ڐ͞Εͳ͍ w ΦϯϓϨ൛͸೥ʹҰ౓ͷϦϦʔε ෆ۩߹मਖ਼ʹ͸௥ՃͰϦϦʔε͕ඞཁ w
طଘͷػೳʹෆ۩߹Λग़͞ͳ͍͜ͱ͕࠷༏ઌ ϓϩμΫτͷ඼࣭ʹର͢Δཁٻ͕ߴ͍

1)1Ξοϓσʔτͷεέδϡʔϧ ೥ ೥
ϦϦʔε ࣄલௐࠪɾ৘ใऩू ຊௐࠪ Ͱͷ࣮૷ ςετ Ͱͷ࣮૷ ෆ۩߹मਖ਼ɾςετ ࣾ಺ద༻ ௐࠪ༻ϒϥϯνͰͷ࡞ۀ ໰୊ݕग़

ΞδΣϯμ w എܠ wϦϦʔεαΠΫϧͱϒϥϯνઓུ w ൺֱԋࢉࢠͷରࡦ w ઈົʹڍಈ͕มΘΔඪ४ϥΠϒϥϦؔ਺ w ·ͱΊ

1)1ΞοϓσʔτͷྲྀΕ ·ͣ͸ӨڹͷௐࠪΛ͢Δͱ͜Ζ͔Β Өڹௐࠪ ࣮૷ ςετ ϦϦʔε

Өڹௐࠪ w ੡඼ͷػೳʹӨڹΛ༩͑ͳ͍ͨΊʹ w 1)1Ͱมߋ͞Εͨશͯͷ߲໨Λ w (BSPPOͷϦϙδτϦͷશͯͷ1)1ίʔυʹରͯ͠ పఈతʹௐࠪ

ௐࠪ಺༰ w 1)1ϚχϡΞϧʹैͬͯߦ͏ w 1)1͸໿݅ͷมߋ 1)1͸݅ऑ w ௐࠪ݁ՌΛݩʹόοΫϩά࡞੒
IUUQTXXXQIQOFUNBOVBMKBNJHSBUJPOQIQ

ϦϦʔεεύϯ w Ϋϥ΢υ൛(BSPPOͷϦϦʔεεύϯ͸௕͍ ϲ݄ʹճͷ৽ػೳ ϲ݄͝ͱʹෆ۩߹मਖ਼ͳͲ w ෳ਺ͷόʔδϣϯ͕ฒߦͰ։ൃ͕ਐΉ w
1)1ͷ։ൃதͰ΋ɺผͷϒϥϯνʹͲΜͲΜίϛοτ͞ΕΔ ৽ػೳ։ൃͱฒߦͯ͠1)1ΞοϓσʔτΛߦ͏ඞཁ͕͋Δ

ฒߦͰ։ൃ͢Δࡍͷ໰୊఺ w ฒߦ͢Δػೳ։ൃϒϥϯνͷ1)1͸·ͩ কདྷతʹ1)1ʹͨ͠ࡍʹ໰୊͕ൃੜ͢ΔՄೳੑ w ৽ن։ൃ෼ͷίʔυʹରͯ͠΋ɺ1)1ͷӨڹΛௐࠪɾରࡦ͢Δඞཁ͋Γ 1)1ϒϥϯν ओྲྀϒϥϯν

৽͍͠ίϛοτʹରͯ͠ ݅ͷӨڹௐࠪΛ౎౓ߦ͏ඞཁ͕͋Δ 1)1։ൃϒϥϯν ཌ݄൛(BSPPO ཌʑ݄൛(BSPPO

ௐࠪίετ΁ͷରࡦ w ֤߲໨ͷௐࠪํ๏ͱௐࠪ݁ՌΛ෼͚Δ มߋ఺ ௐࠪํ๏ ௐࠪ݁Ռ ϒϥϯν ϑΝΠϧ9ͰBCT Λ࢖༻
ϒϥϯν ֘౰ͳ͠ TUSJDU@UZQFTͷϑΝΠϧͰ͜ΕΒͷؔ਺Λ࢖༻͢Δ͔ௐࠪ BCT ͳͲͷ਺ֶؔ਺͕TUSJDU@UZQFTʹਖ਼͘͠ै͏Α͏ʹͳͬͨ

෼͚ͨ͜ͱͷޮՌ w ͦΕͧΕͷมߋ఺ʹ͍ͭͯ஌ݟ͕ਂ·ΓɺνʔϜ಺Ͱௐࠪํ๏Λ౷ҰͰ͖ͨ w ߲໨ʹΑͬͯ͸ࣗಈతʹௐࠪͰ͖ͨ w ࣗಈௐࠪ༻ͷεΫϦϓτΛ࡞੒ ਓྗͰௐࠪ͢Δ߲໨͸݅΄Ͳʹ
Ϛʔδ࣌ͷӨڹௐࠪͷίετΛ࡟ݮͰ͖ͨ

ϚχϡΞϧΛಡΜ͚ͩͩͰશͯ͏·͍͔͘͘ʁ w ࣮ࡍʹͲΕ͘Β͍໰୊͕ग़Δ͔͸ະ஌਺ w ϚχϡΞϧʹॻ͍ͯͳ͍͜ͱ͕Өڹ͢Δ͔΋͠Εͳ͍ Ͳ͜·Ͱमਖ਼ΛՃ͑Ε͹$*͕௨ΔΑ͏ʹͳΔʁ

(BSPPOͷ$* $JSDMF$* w 1)1Ξοϓσʔτʹେ͖ؔ͘ΘΔͷ͸ҎԼͷεςοϓ 1)1ຊମͷϏϧυ͸ঢ়گ͕ෳࡶ 1)1ͷϏϧυ Ϣχοτςετ 1)16OJU &&ςετ
4FMFOJVN

1)1ͷόʔδϣϯ্͚ͩ͛ͨϒϥϯν w ςετɾϨϏϡʔෆཁͷঢ়ଶͰΨϯΨϯ໰୊Λղফ͍ͯͬͯ͠ΈΔ w ݟ͔ͭͬͨ໰୊ɿ 1)1ຊମ͕มߋ͞ΕͨͨΊύονϑΝΠϧ͕ద༻Ͱ͖ͳ͍ 1)1֦ுͰఆٛ͞ΕͨΫϥεͷίϯετϥΫλ໊͕ݹ͍ܗࣜͩͬͨ
ϚχϡΞϧΛಡΉ͚ͩͰ͸෼͔Βͳ͍໰୊ΛૣظൃݟͰ͖ͨ

ϒϥϯνઓུɿ·ͱΊ w 1)1ͷΞοϓσʔτ͸ฒߦ͢ΔϒϥϯνͰߦΘΕΔ 1)1ͷόʔδϣϯΛৗʹҙࣝͯ͠։ൃΛਐΊΔ w ௐࠪํ๏ͱௐࠪ݁ՌΛ෼཭͢Δ͜ͱͰௐࠪͷݟ௨͕͠Α͘ͳΔ ࠶ݱੑͷ͋Δௐࠪํ๏ΛνʔϜͰڞ༗Ͱ͖Δ w
1)1ͷόʔδϣϯ্͚ͩ͛ΔϒϥϯνͰࢼͯ͠ΈΔ ੡඼ݻ༗ͷ໰୊Λૣ͍ஈ֊Ͱચ͍ग़͢͜ͱ͕Ͱ͖Δ

ΞδΣϯμ w എܠ w ϦϦʔεαΠΫϧͱϒϥϯνઓུ wൺֱԋࢉࢠͷରࡦ w ઈົʹڍಈ͕มΘΔඪ४ϥΠϒϥϦؔ਺ w ·ͱΊ

1)1Ͱ͸ൺֱԋࢉ͕มΘΔ 1)13'$4BOFSTUSJOHUPOVNCFSDPNQBSJTPOT 1)13'$4BOFSOVNFSJDTUSJOHT w ͲͪΒ΋ڍಈΛ௚ײతͰ੔߹ੑΛͱΔΑ͏ʹ͢ΔఏҊ ੈͷதʹ͸ͦ͏͍ͬͨڍಈʹʢ҉໧తʹʣґଘ͍ͯ͠ΔγεςϜ΋͋Δ
ϓϩάϥϛϯάݴޠͷࠜװʹؔΘΔಈ࡞͕มΘΔ

ൺֱԋࢉࢠͷڍಈมԽ w จࣈྻWT਺஋ͷൺֱํ๏͕มԽ 1)1 1)1 1)1 ਺஋ܗࣜ 'hoge'
== 0 'hoge' == 0 '25.0' == 25 (int)'hoge' == 0 'hoge' == (string)0 (double)'25.0' == 25 0 == 0 'hoge' == '0' 25.0 == 25 true false true (ͱมΘΒͣ)

ൺֱԋࢉࢠͷڍಈมԽ w จࣈྻಉ࢜ͷൺֱ΋มΘΔ 1)1 1)1 '42' == '42
' '42' == '42 ' '42 ' ͕਺஋ܗࣜͰ͸ͳ͍ '42 ' ͕਺஋ܗࣜͱͳΔ จࣈྻͱͯ͠ൺֱ ਺஋ʹม׵ͯ͠ൺֱ false true

มԽ͢Δԋࢉࢠɾؔ਺ w ݫີͰͳ͍ൺֱԋࢉࢠ͢΂ͯ ==, != ͷଞʹ΋ >, >=, <, <=,
<=> ΋Өڹ w ഑ྻૢ࡞ܥͷඪ४ؔ਺ɿin_array(), array_search(), array_keys() w ιʔτܥͷؔ਺ɿsort(), rsort(), ... ԋࢉࢠҎ֎ʹ΋มԽ͕͋Δʂ

(BSPPOʹର͢ΔӨڹ w ߦҎ্ ԋࢉࢠ͕࢖ΘΕ͍ͯΔՕॴ w ϩδοΫʹؒҧ͍ͳ͘Өڹ͢Δ σʔλϕʔεʹෆ੔߹͕ى͜Δ͜ͱ͸ઈରʹආ͚͍ͨ

Կ͔ରࡦ͸ͳ͍͔ʁ w ίʔυ্ͰӨڹΛௐ΂Δͷ͸ݱ࣮తͰ͸ͳ͍ ຊ൪σʔλϕʔεͷ஋͸ଟछଟ༷ w ࣮ࡍʹςετ͢Δ͔͠ͳ͍ ࡉ͔͍ϩδοΫ͕มΘͬͨ͜ͱΛݕग़Ͱ͖Δ͔ʁ
if ($id == 0) { ... ࣮ߦ࣌ʹ݁Ռ͕Θ͔Δ͜ͱΛݕ஌Ͱ͖ͳ͍͔ʁ if ($id == 0) { ... if ($id == 0) { ... if ($id == 0) { ...

ରࡦ w 1)1ຊମΛվ଄͢ΔύονΛ࡞੒ w 1)1ͱͰ݁Ռ͕มΘΔΑ͏ͳൺֱԋࢉΛݕग़ w &@8"3/*/(Ϩϕϧͷ1)1ΤϥʔΛ౤͛ΔΑ͏ʹ͢Δ 1)1ຊମͷൺֱԋࢉΛߦ͏ॲཧʹػೳ௥Ճ

ύονͷ࣮૷ w 1)1಺෦Ͱ͸ݫີͰͳ͍ൺֱԋࢉΛߦ͏ॲཧΛվ଄ w 1)1ʹ1)1ͷൺֱॲཧΛҠ২͠ɺ྆ํͷ݁ՌΛൺ΂Δ Ҡ২͞Εͨ 1)1ͷൺֱॲཧ ΦϦδφϧͷ 1)1ͷൺֱॲཧ
݁Ռ͕ҟͳΕ͹ܯࠂ

ύονΛ࡞ͬͨޮՌ w ൺֱԋࢉࢠҎ֎ͷؔ਺Ͱ΋มԽΛݕग़Ͱ͖Δ in_array, sort, ... w ຊ൪؀ڥͰ΋͠ൃੜͯ͠΋ϦΫΤετΛதஅͰ͖Δ ൺֱԋࢉͷมԽʹΑΔϩδοΫͷมԽΛະવʹ๷͛ͨ

ςετͰͷ׆༻ w ύονΛ༗ޮʹͨ͠ঢ়ଶͰࣗಈςετΛ࣮ߦ w 2"νʔϜʹΑΔςετʹߩݙ ϩδοΫͷมԽΛ1)1ΤϥʔͰՄࢹԽ ൺֱԋࢉͷ໰୊ΛΑΓޮ཰Α͘ݕग़

1)1؀ڥͰͷௐࠪ w ҟৗܥΛ͢΂ͯςετ͢Δͷ͸ࠔ೉ w Քಇதͷ1)1؀ڥΛ࢖ͬͯ໰୊ݕग़Ͱ͖ͳ͍͔ʁ w 1)1؀ڥ޲͚ʹύονΛ࡞੒ ࣄલʹຊ൪؀ڥͰ΋໰୊ͷચ͍ग़͠Λߦͬͨ

1)1؀ڥͰͷௐࠪͷྲྀΕ ύονΛ౰ͯͨ1)1 Τϥʔϋϯυϥ ϩάϑΝΠϧ(SBZMPH ൺֱԋࢉࢠͷ&@8"3/*/( ൃੜͨ͠ϑΝΠϧɾߦΛه࿥ ؂ࢹɾमਖ਼ 'hoge' ==
0 ԋࢉ݁ՌͷมԽΛݕग़

ௐࠪͷ݁Ռ w ϲ݄Ͱ໿݅ͷ໰୊Λݕग़ w ൺֱԋࢉࢠʹΑΔݒ೦͕΄ͱΜͲͳ͍ঢ়ଶͰ1)1΁ҠߦͰ͖ͨ w ݱࡏͷ(BSPPOͰ΋ɺൺֱԋࢉࢠ·ΘΓͷτϥϒϧ͸ൃੜ͍ͯ͠ͳ͍ (BSPPOͰ͸ൺֱԋࢉࢠͷ໰୊Λ͢΂ͯղফͰ͖ͨ

ൺֱԋࢉࢠɿ·ͱΊ w ൺֱԋࢉͷมԽ͸ൺֱԋࢉࢠҎ֎ʹ΋ӨڹΛ༩͑Δ w (BSPPOͰ͸1)1ຊମΛվ଄͠ɺൺֱԋࢉͷڍಈมԽΛݕग़ ڍಈͷมԽΛΤϥʔͱͯ͠Θ͔ΔܗͰදࣔ खಈɾࣗಈςετͰམͱ͢͜ͱ͕Ͱ͖ͨ w
ຊ൪؀ڥΛར༻ͨ͠໰୊ͷݕग़͕ޭΛ૗ͨ͠ w Ҏ্ͷରࡦͰɺൺֱԋࢉʹ·ͭΘΔ໰୊Λղܾͨ͠

ΞδΣϯμ w എܠ w ϦϦʔεαΠΫϧͱϒϥϯνઓུ w ൺֱԋࢉࢠͷରࡦ wઈົʹڍಈ͕มΘΔඪ४ϥΠϒϥϦؔ਺ w ·ͱΊ

ઈົʹڍಈ͕มΘΔඪ४ؔ਺ w 1)1ϚχϡΞϧͷʮԼҐޓ׵ੑͷͳ͍มߋ఺ʯʹ·ͱΊΒΕ͍ͯΔ w େମͷ৔߹͸%FQSFDBUFEͷܯࠂ͕1)1Ͱ͸ൃੜ͢Δ w ͦ͏Ͱ͸ͳ͍ؔ਺Λத৺ʹ঺հ NLUJNF HNNLUJNF
BSSBZ@TQMJDF TVCTUS TUSQPT NC@TUSQPT

Ҿ਺ʹOVMM͕ࢦఆͰ͖ΔΑ͏ʹͳΔؔ਺ w 1)1͔ΒɺҰ෦ͷҾ਺ʹOVMM͕ࢦఆͰ͖Δ • substr(), array_splice() • mktime(), gmmktime()
OVMMΛࢦఆͨ͠৔߹ͷڍಈ͕มΘΔ

TVCTUS BSSBZ@TQMJDF w ͲͪΒ΋MFOHUIҾ਺ʹOVMMΛࢦఆՄೳʹͳͬͨ w 1)1Ҏલ͸OVMM͕ͱղऍ͞ΕΔ w 1)1Ҏ߱͸ɺҾ਺Λ༩͑ͳ͍ͷͱಉ͡Α͏ʹղऍ͞ΕΔ IUUQTWMPSH

NLUJNF HNNLUJNF w ೔෇͔Β6OJYλΠϜελϯϓΛٻΊΔ mktime($hour, $minute, $second, $month, $day, $year)
w 1)1Ҏલ͸OVMM͸ʹΩϟετ͞Ε͍ͯͨ w 1)1Ҏ߱͸OVMM͕ݱࡏ࣌ࠁΛද͢Α͏ʹͳͬͨ ݱࡏͷ೔࣌ʹΑͬͯ݁Ռ͕มΘΔόάͷՄೳੑ

จࣈྻݕࡧܥؔ਺ͷOFFEMFҾ਺ w TUSQPT NC@TUSQPT ͳͲͷݕࡧର৅ OFFEMF ʹۭจࣈྻΛࢦఆՄೳʹ 1)1·Ͱɿܯࠂ͕ൃੜ͠ɺGBMTF͕ฦͬͯ͘Δ
1)1͔Βɿจࣈྻͷઌ಄ʹҰக͕ͯ͠ฦͬͯ͘Δ TUSQPT GBMTFͷ݁Ռ͕มΘΔ

TVCTUS ͷڥքΛӽ͑ͨ৔߹ͷॲཧ 1)1·ͰɿMFOHUIͷਖ਼ෛͳͲʹΑΓGBMTF͔ۭจࣈྻ 1)1͔ΒɿඞۭͣจࣈྻʹͳΔ w TUSJOH P
ff TFU " # $ MFOHUI

(BSPPOͰͷରॲํ਑ w ݸผରॲ͕Մೳͳ਺ͳΒͦͷ··ରॲΛਐΊΔ w ෆՄೳͳΒݹ͍ڍಈΛΤϛϡϨʔτ͢Δؔ਺Ͱஔ͖׵͑ ྫNC@TUSQPT function cb_mb_strpos($haystack,
$needle, $offset = 0, $encoding = null) { if ($needle === "" || $needle === null) { return false; } return mb_strpos($haystack, $needle, $offset, $encoding); }

ઈົʹڍಈ͕มΘΔඪ४ؔ਺ɿ·ͱΊ OVMMΛड͚ೖΕΔΑ͏ʹͳΔؔ਺ OVMMΛ౉ͨ͠Βڍಈ͕มΘΔؔ਺ w TVCTUS BSSBZ@TQMJDF NLUJNF HNNLUJNF ʹ஫ҙ

·ͱΊ

1)1Ξοϓσʔτ૯·ͱΊ w ϓϩμΫτͷϒϥϯνͷಈ͖Λҙࣝͨ͠1)1Ξοϓσʔτ ໿Ұ೥ؒͷ׆ಈظؒΛܦͯແࣄʹΞοϓσʔτ׬ྃ 1)1ϚχϡΞϧʗ࣮ࡍͷϓϩμΫτΛ΋ͱʹͨ͠ૣظͷௐࠪͰ஌ݟΛಘΔ w ൺֱԋࢉࢠͷมԽΛݕ஌͢Δ࢓૊Έ͕ޭΛ૗ͨ͠
ຊ൪؀ڥΛ༻͍ͨௐࠪͰෆ҆Λ෷১Ͱ͖ͨ w ͱʹ͔͘ɺޓ׵ੑʹ·ͭΘΔ໰୊Λૣظൃݟ͢Δ͜ͱ͕ॏཁͩͬͨ ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠

એ఻ɿ࠲ஊձ΍Γ·͢ IUUQTDZCP[VDPOOQBTTDPNFWFOU

ະ࢖༻εϥΠυ

1)1ͷ಺෦"1*ʹ·ͭΘΔมߋ w $JSDMF$*ͷδϣϒͰ1)1Λιʔε͔ΒϏϧυ ಠࣗͷ1)1֦ுʢ$ݴޠͰॻ͔Ε֦ͨுϞδϡʔϧʣ͕͋Δ 1)1ຊମͷιʔείʔυΛมߋ͢ΔύονϑΝΠϧΛ͍͔ͭ͘ద༻ w Ϗϧυ͞Ε࣮ͨߦϑΝΠϧҰࣜ͸4ʹΞοϓϩʔυ͞ΕΔ w
-JOVY8JOEPXT޲͚ͷϏϧυ؀ڥ͕͋Δ

1)1ͷ಺෦"1*ʹ·ͭΘΔมߋ w 1)1֦ுͷ࡞ऀͷͨΊͷҠߦϚχϡΞϧ͕QIQTSDʹ͋Δ IUUQTHJUIVCDPNQIQQIQTSDCMPCNBTUFS 61(3"%*/(*/5&3/"-4 w (BSPPO͸ຖ೥ͳʹ͔͠Βͷ໰୊Λ౿ΜͰ֦ுͷίʔυΛमਖ਼͍ͯ͠Δ w ͪ͜Β΋ಉ͡Α͏ʹɺௐࠪͯ͠վमΛߦ͏
w ͨͩ͠ɺมߋස౓͕গͳ͍ͨΊجຊతʹௐࠪ͸ճ͖ΓͰे෼

1)1ͷ಺෦"1*ʹ·ͭΘΔมߋ w ؔ਺ɾϝιουʹBSHJOGPΛ༩͑ͳ͍ͱ8BSOJOHʹͳΔ Ҿ਺ͷ৘ใʢ໊લɺܕʣͷ৘ใΛ1)1֦ுͰఆٛͨؔ͠਺ʹ༩͑Δ w 543.ϚΫϩͷഇࢭ εϨουηʔϑܥͷରԠɻ1)1ܥͰ࣮࣭ແޮԽ͞ΕͨͨΊ࡟আ͢Δ͚ͩ w
Ϋϥεͱಉ໊ͷϝιου͕ίϯετϥΫλ໊ͱͯ͠ೝࣝ͞Εͳ͘ͳͬͨ 1)1εΫϦϓτͰ͸ܯࠂ͕ग़͍͕ͯͨɺ1)1֦ுͰ͸ܯࠂ͞Εͳ͔ͬͨ

1)1Τϥʔ w Τϥʔͷൃੜ࣍ୈɺΤϥʔϋϯυϥʹΑΓॲཧ͞ΕΔ w ྫ֎ͷΑ͏ʹݺग़ݩ΁ͱ఻೻͠ͳ͍ɻׂΓࠐΈϋϯυϥʹ͍ۙ w &@%&13&$"5&% &@/05*$& &@8"3/*/(ͳͲɺ͍͔ͭ͘ͷϨϕϧ͕͋Δ w
FSSPS@SFQPSUJOHؔ਺ͰɺಛఆͷϨϕϧͷΤϥʔΛແࢹͤ͞Δ͜ͱ͕Ͱ͖Δ w 1)1ϓϩάϥϜશମͰ༗ޮͳΧελϜͷϋϯυϥΛهड़Մೳ w ΧελϜϋϯυϥͰ1)1ΤϥʔΛ཈੍͠ɺॲཧΛଓߦՄೳ

1)1Τϥʔ w ͍͔ͭ͘ͷ&@/05*$&͕&@8"3/*/(ʹঢ֨ • Attempting to read an unde fi
ned variable. • Attempting to read an unde fi ned property. • Attempting to read an unde fi ned array key. • Attempting to read a property of a non-object. • Attempting to access an array index of a non-array. • Attempting to convert an array to string. • Attempting to use a resource as an array key. • Attempting to use null, a boolean, or a fl oat as a string offset. • Attempting to read an out-of-bounds string offset. • Attempting to assign an empty string to a string offset. • جຊతʹ͸ @ ԋࢉࢠ͸ґવͱͯ͠༗ޮɻΤϥʔϋϯυϥͰͷରॲ΋໰୊ͳ͘Ͱ͖Δ

1)1Τϥʔ w ͋Δ044ͷதͰFSSPS@SFQPSUJOH Ͱ&@/05*$&Λແޮʹ͍ͯͨ͠ʂ w ͦͷ044͔ΒίʔϧόοΫ͞ΕΔܗͰҰ෦ͷίʔυ͕ಈ࡞ͯͨ͠ w ࠓ·Ͱ཈੍͞Ε͍ͯͨ&@/05*$&͕&@8"3/*/(ʹͳΓɺ๫ΕճΔ w Өڹ͕͋·Γʹ΋޿͔ͬͨ
w ରॲɿFSSPS@SFQPSUJOH Ͱ&@/05*$&͕੾ΒΕͯͨͱ͖ͷΈɺಛఆͷ &@8"3/*/(ΛΤϥʔϋϯυϥͰ཈੍ͤ͞Δ

1)1Τϥʔ w ͍··ͰجຊతʹΤϥʔϋϯυϥͰ཈੍͍ͯ͠ͳ͚Ε͹໰୊ͳ͍ • Attempting to write to a property
of a non-object. • Attempting to append an element to an array for which the PHP_INT_MAX key is already used. • Attempting to use an invalid type (array or object) as an array key or string offset. • Attempting to write to an array index of a scalar value. • Attempting to unpack a non-array/Traversable. • Attempting to access unquali fi ed constants which are unde fi ned. w ͨͩɺ!ԋࢉࢠͰ཈੍͞Εͯͨ৔߹͸؏௨͢Δ w ରॲ1)1؀ڥͰ͜ΕΒͷ&@8"3/*/(Λัଊ͠ɺϞχλ͢Δ /6--ʹର͢ΔϓϩύςΟͷॻ͖ࠐΈ͕݅ݟ͔ͭͬͨ

20年ものの巨大レガシープロダクトを PHP 8.0にアップデートした際の対策と得られた知見

20年ものの巨大レガシープロダクトを PHP 8.0にアップデートした際の対策と得られた知見

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