プロなら絶対避けるべき！ WordPress 12の落とし穴

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ϓϩͳΒઈରආ͚Δ΂͖ʂ 8PSE1SFTTͷམͱ݀͠

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࿩͢ਓ ࡾ޷ོ೭ ߹ಉձࣾϩοΫϩϒελʔ୅ද 8PSE1SFTTϓϥάΠϯ։ൃऀ ෱Ԭݝफ૾ࢢग़਎

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$POUBDU'PSN ສ௒ͷαΠτͰ࢖ΘΕΔ໰͍߹ΘͤϑΥʔϜϓϥάΠϯ

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#PHP γϯϓϧͳଟݴޠԽϓϥάΠϯ

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ηΩϡϦςΟΠϯγσϯτ΍େن໛ো֐͸  ຖ೔Ͳ͔͜Ͱൃੜ͍ͯ͠·͢ɻ w 8BOOB$SZ૽ಈ w 8PSE1SFTTͷ3&45"1*ؔ࿈੬ऑੑ૽ಈ ͍͍ͬͨ୭͕੹೚Λෛ͏ͷͰ͠ΐ͏͔

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l5IJTQSPHSBNJTEJTUSJCVUFEJOUIF IPQFUIBUJUXJMMCFVTFGVM CVU 8*5)065"/:8"33"/5:z r8PSE1SFTTMJDFOTFUYUΑΓൈਮ

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ආ͚Δ΂͖৘ใݯ ආ͚Δ΂͖ ςʔϚɺϓϥάΠϯ ආ͚Δ΂͖ΧελϚΠζ 8PSE1SFTTͱ ਖ਼͘͠දه͍ͯ͠ͳ͍ (1-ʹ४ڌ͍ͯ͠ͳ͍ (1-Ͱ͸ͳ͍ RVFSZ@QPTUT ͷ࢖༻ υϝΠϯʹ XPSEQSFTTؚ͕·ΕΔ ༗ঈͷ΋ͷ QSF@HFU@QPTUTͷ࢖༻ 8PSE1SFTT΍ ϓϥάΠϯຊମͷ ίʔυվมΛקΊͯ͘Δ ௕ظؒ ߋ৽͞Ε͍ͯͳ͍΋ͷ ʮڞ༗44-ʯͷ࢖༻ ʮίϐϖͰ0,ʯ ͱ͔ݴͬͯ͘Δ &YFD1)1 ࣗಈΞοϓσʔτͷ཈੍

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ආ͚Δ΂͖৘ใݯ 8PSE1SFTTͱ ਖ਼͘͠දه͍ͯ͠ͳ͍

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ؒҧ͍ͷྫ 8PSEQSFTT 8PSE㾐1SFTT 1͸େจࣈ εϖʔεۭ͚ͳ͍

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ආ͚Δ΂͖৘ใݯ 8PSE1SFTTͱ ਖ਼͘͠දه͍ͯ͠ͳ͍ w ਖ਼֬ͳදه͸ϓϩͱͯ͠جຊதͷجຊͰ͢ w ؒҧͬͨදه͸ॻ͖खͷཧղͷઙ͞Λ͍ࣔͯ͠·͢ Կނʁ

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ଞʹ΋ w +BWB4DSJQU w 8JLJQFEJB w 1IPUPTIPQɺ౳ʑ ؾΛ͚ͭ·͠ΐ͏

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ආ͚Δ΂͖৘ใݯ υϝΠϯʹ XPSEQSFTTؚ͕·ΕΔ

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8PSE1SFTT͸  8PSE1SFTTϑΝ΢ϯσʔγϣϯ͕  อ༗ɾ؅ཧ͢Δ঎ඪͰ͢ υϝΠϯ໊ͰͷXPSEQSFTTͷ࢖༻͸ېࢭ͞Ε͍ͯ·͢

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ආ͚Δ΂͖৘ใݯ υϝΠϯʹ XPSEQSFTTؚ͕·ΕΔ w ঎ඪΛؚΉ஌తࡒ࢈ݖͷܰࢹ͸ΞϚνϡΞͷূͰ͢ Կނʁ

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ආ͚Δ΂͖৘ใݯ 8PSE1SFTT΍ ϓϥάΠϯຊମͷ ίʔυվมΛקΊͯ͘Δ

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ආ͚Δ΂͖৘ใݯ 8PSE1SFTT΍ ϓϥάΠϯຊମͷ ίʔυվมΛקΊͯ͘Δ w ͦͷվม͸࣍ճΞοϓσʔτͷ࣌ʹࣦΘΕ·͢ w Ή΍ΈʹίʔυΛ͍͡ΔͱޙͰͲ͜ΛͲ͏ม͔͑ͨ Θ͔Βͳ͘ͳΓ·͢ Կނʁ

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ආ͚Δ΂͖৘ใݯ ʮίϐϖͰ0,ʯ ͱ͔ݴͬͯ͘Δ

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ආ͚Δ΂͖৘ใݯ ʮίϐϖͰ0,ʯ ͱ͔ݴͬͯ͘Δ w ίϐϖͰ΋ύΫΓͰ΋ؔ܎ͳ͘ॻ͍ͨίʔυͷ੹೚ ͸ࣗ෼͕ෛ͏͜ͱʹͳΓ·͢ w ͦͷίʔυ͕ԿΛ͢Δ΋ͷ͔ཧղͯ͠࢖͏͜ͱ Կނʁ

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Θ͔Βͳ͍͜ͱʹͿ͔ͭͬͨ࣌ͷରॲํ͸࣍ͷࡾ୒ w Θ͔Δ·Ͱษڧ͢Δ w Θ͔Δਓʹ೚ͤΔ w ͖͋ΒΊΔ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ (1-ʹ४ڌ͍ͯ͠ͳ͍ (1-Ͱ͸ͳ͍

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ʲ(1-(FOFSBM1VCMJD-JDFOTFʳ 8PSE1SFTT౳͕࠾༻͢Δ  ୅දతͳࣗ༝ιϑτ΢ΣΞϥΠηϯε ʲࣗ༝ιϑτ΢ΣΞʳ ࣮ߦɺίϐʔɺ഑෍ɺݚڀɺมߋɺվྑ͢Δ ࣗ༝Λར༻ऀ͕༗͢Διϑτ΢ΣΞ

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r8PSE1SFTTMJDFOTFUYUΑΓൈਮ l$PQZSJHIU  CZUIFDPOUSJCVUPSTz ʮϑϦʔιϑτ΢ΣΞʯͱʮஶ࡞ݖϑϦʔʯΛ  ࠞಉ͠ͳ͍Α͏ʹ

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w ʓʓͷ໨తʹ࢖༻ͯ͠͸ͳΒͳ͍ w ෳ਺ͷαΠτʹΠϯετʔϧͯ͠͸ͳΒͳ͍ w ϑολͷϦϯΫΛ࡟আͯ͠͸ͳΒͳ͍ w ࠶഑෍ͯ͠͸ͳΒͳ͍ ࣗ༝ιϑτ΢ΣΞͱໃ६͢Δ ࣗ༝Λ੍ݶ͢Δ৚߲ͷྫ

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ʲίϐʔϨϑτʳ ར༻ऀ͕࠶഑෍͢Δࡍʹ͸ΦϦδφϧͱಉ౳ͷ  ࣗ༝Λอূ͠ͳ͚Ε͹ͳΒͳ͍ͱ͢Δߟ͑ํ ͭ·Γɺ(1-Ͱ഑෍͞ΕΔιϑτ΢ΣΞͷίϐʔ ΋·ͨ(1-Ͱ഑෍͞Εͳ͚Ε͹ͳΒͳ͍

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ʲ(1-ʳ 1)1ϑΝΠϧ͚ͩͰͳ͘  $44΍+BWB4DSJQUͷϑΝΠϧ΋ؚΉ શମ͕(1-४ڌͰ͋Δ͜ͱ

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8PSE$BNQ΍8PSE#FODI౳ͷίϛϡχςΟ  ӡӦΠϕϯτͰ͸ɺ(1-Ͱ͸ͳ͍ςʔϚɺ  ϓϥάΠϯΛ഑෍·ͨ͸એ఻͢Δਓ෺ɺاۀ͕  ొஃऀɺεϙϯαʔɺӡӦελοϑʹͳΔ͜ͱΛ ېࢭ͍ͯ͠·͢

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ (1-ʹ४ڌ͍ͯ͠ͳ͍ (1-Ͱ͸ͳ͍ w ໌֬ͳϥΠηϯεҧ൓ஶ࡞ݖ৵֐ͱͳΔ  Մೳੑ͕͋Γ·͢ w ίϛϡχςΟ͔Β׻ܴ͞Ε·ͤΜ Կނʁ

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w 5$% w ݡҖ w 45*/(&3 w 5IFNF'PSFTUͰൢച͞ΕΔςʔϚ w $PEF$BOZPOͰൢച͞ΕΔϓϥάΠϯ (1-ʹ४ڌ͍ͯ͠ͳ͍(1-Ͱ͸ͳ͍ ςʔϚɺϓϥάΠϯͷྫ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ ༗ঈͷ΋ͷ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ ༗ঈͷ΋ͷ w ແঈͷ΋ͷͱൺֱͯ͠ΫΦϦςΟͷ໘ͰྼΓ·͢ Կނʁ

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ແঈͷ΋ͷ ༗ঈͷ΋ͷ ແঈͷςʔϚɺϓϥάΠϯ͕  ༗ঈͷ΋ͷʹΫΦϦςΟ໘Ͱ༏ΕΔཧ༝ ϑΟʔυόοΫॏཁ

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rʮϦʔφεͷ๏ଇʯͱͯ͠஌ΒΕΔ֨ݴ l(JWFOFOPVHIFZFCBMMT BMMCVHTBSFTIBMMPXz ʢ໨ۄͷ਺͑͞े෼͋Ε͹ɺ ͲΜͳόά΋ਂࠁͰ͸ͳ͍ʣ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ ༗ঈͷ΋ͷ w αϙʔτϑΥʔϥϜͰαϙʔτΛड͚ΒΕͳ͘ͳΓ ·͢ Կނʁ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ ௕ظؒߋ৽͞Ε͍ͯͳ͍΋ͷ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ ௕ظؒߋ৽  ͞Ε͍ͯͳ͍΋ͷ w ϝϯςφϯε͞Ε͍ͯͳ͍΋ͷΛ࢖͏ͷ͸  ͍ͨ΁ΜةݥͰ͢ Կނʁ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ &YFD1)1

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ʮ&YFD1)1ϓϥάΠϯ͸౤ߘɺݻఆϖʔδɺ  ςΩετ΢ΟδΣοτ಺Ͱ1)1ίʔυΛ࣮ߦ͠·͢ʯ

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ආ͚Δ΂͖ςʔϚɺϓϥάΠϯ &YFD1)1 w ࢖͏͜ͱࣗମ͕ةݥߦҝͰ͢ w 1)1ίʔυฤूͷݖݶ؅ཧ͸ݫີʹ͠·͠ΐ͏ w ଟ͘ͷ৔߹γϣʔτίʔυͷར༻Ͱ୅ସͰ͖·͢ Կނʁ

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ආ͚Δ΂͖ΧελϚΠζ RVFSZ@QPTUT ͷ࢖༻

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ආ͚Δ΂͖ΧελϚΠζ RVFSZ@QPTUT ͷ࢖༻ w ςʔϚ΍ϓϥάΠϯͰͷRVFSZ@QPTUT ͷ࢖༻͸ ਪ঑͞Εͳ͘ͳΓ·ͨ͠ Կނʁ

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ආ͚Δ΂͖ΧελϚΠζ QSF@HFU@QPTUTͷ࢖༻

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ʮRVFSZ@QPTUT ͷ୅ΘΓʹ ㅟ ㅟ ㅟ ㅟ QSF@HFU@QPTUTΛ࢖͍ͳ͍͞ʯ

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RVFSZ@QPTUT 8PSE1SFTTͷϝΠϯΫΤϦʔΛ  ڧ੍తʹ্ॻ͖͢Δؔ਺ QSF@HFU@QPTUT ΫΤϦʔॲཧͷաఔͰॲཧ͞ΕΔ  ΞΫγϣϯϑοΫ શવผ෺

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ආ͚Δ΂͖ΧελϚΠζ QSF@HFU@QPTUTͷ࢖༻ w ؅ཧը໘ΛؚΉαΠτͷશྖҬʹӨڹ͕ٴͼ·͢ w ෆ۩߹ͷݪҼಛఆ͕ۃΊͯࠔ೉ʹͳΓ·͢ Կނʁ

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ͦ΋ͦ΋ϝΠϯΫΤϦʔΛ  ॻ͖׵͑Δඞཁ͸͋ͬͨͷ͔ ΄ͱΜͲͷ৔߹ HFU@QPTUT ΍81@2VFSZΫϥεΛ ࢖͏΄͏͕Α͍

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ආ͚Δ΂͖ΧελϚΠζ ʮڞ༗44-ʯͷ࢖༻

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ආ͚Δ΂͖ΧελϚΠζ ʮڞ༗44-ʯͷ࢖༻ w αΠτͷ৴༻ͷ໘Ͱ͸Ή͠ΖϚΠφεʹಇ͖·͢ w ʮڞ༗ʯͰ͸ͳ͍ຊ෺ͷ44-Λ࢖͍·͠ΐ͏ Կނʁ