比較演算を壊してみる / php-break-comparison

by yammerjp

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தࢁܚ༞ ΍Μ·ʔ ൺֱԋࢉΛյͯ͠ΈΔ 1)15FDI$BGF1)1FSͷͨΊͷʮ1)1ΧϯϑΝϨϯεʯΛޠΓ߹͏

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͸͡Ί·ͯ͠ 1)15FDI$BGFʹ͸͡ΊͯࢀՃ͍͖ͤͯͨͩ͞·͢ Ͳ͏ͧΑΖ͓͘͠ئ͍͍ͨ͠·͢

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தࢁܚ༞ w ৬ۀ8FCΞϓϦέʔγϣϯ ΤϯδχΞ ʙ w 1)1ྺ೥͘Β͍ w झຯEPU fi MFTͷ؅ཧ w 5XJUUFS(JU)VCZBNNFSKQ ΍Μ·ʔ

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1)1$POGFSFODFʹొஃ͍ͯ͠·ͨ͠ ʙ ͍ͪ͹Μ࠷ॳͷηογϣϯ ೥ଓ͘8FCΞϓϦέʔγϣϯΛվળ͢Δʙ৽ଔ೥໨͔ΒΈΔΧϥʔϛʔγϣοϓʙ IUUQTTQFBLFSEFDLDPNZBNNFSKQJODSFNFOUBMJNQSPWFNFOUCZEFWJTJOHBQQMJDBUJPODIBOHFCPVOEBSJFT

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lൃද಺༰ΛউखʹৼΓฦΓ·͢z ࠓ೔ͷςʔϚʮ1)1ΧϯϑΝϨϯεʯΛޠΓ߹͏ ͋ΔηογϣϯΛΈͯखΛಈ͔ͨ͜͠ͱʹ͍ͭͯ࿩͠·͢ IUUQTSBLVTDPOOQBTTDPNFWFOU

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l೥΋ͷͷڊେϨΨγʔϓϩμΫτΛ1)1 ʹΞοϓσʔτͨ͠ࡍͷରࡦͱಘΒΕͨ஌ݟz ໘ന͔ͬͨηογϣϯ ʙ5SBDL IUUQTGPSUFFKQQIQDPOQSPQPTBMGGFFCDGFFE

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IUUQTGPSUFFKQQIQDPOQSPQPTBMGGFFCDGFFE l೥΋ͷͷڊେϨΨγʔϓϩμΫτΛ1)1 ʹΞοϓσʔτͨ͠ࡍͷରࡦͱಘΒΕͨ஌ݟz w1)1ͷϥϯλΠϜʹಠࣗͷύονΛ౰ͯΔ wͱඇޓ׵ͳൺֱԋࢉ࣌ʹ&@8"3/*/(Λग़͢ ൃදͰ঺հ͞Ε͍ͯͨɺΞοϓσʔτͷࣄલௐࠪͰͱΒΕͨํ๏

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1)1ˠͰɺൺֱԋࢉͷڍಈ͕͔ΘΔ bTUSJOH` 1)1 ˠUSVF 1)1 ˠGBMTF

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1)1ˠͰɺൺֱԋࢉͷڍಈ͕͔ΘΔ bTUSJOH` 1)1 ˠUSVF 1)1 ˠGBMTF &@8"3/*/(Λ ൃੜͤ͞Δ

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΍ͬͯΈ͍ͨ ΊͪΌͪ͘Ό໘നͦ͏༗༻ͦ͏ͳͷͰɺಉ͜͡ͱΛ΍ͬͯΈ͍ͨ

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΍ͬͯΈΔ

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Ͱ΋ɺ1)1ຊମʹ खΛೖΕͨ͜ͱ͸ͳ͍ʜ

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ΰʔϧൺֱԋࢉΛյͯ͠ΈΔ ಉ༷ͷ࣮૷͸೉қ౓͕ߴ͍ͷͰɺ·ͣ͸ൺֱԋࢉͷڍಈ͕ԿΒ͔มߋ ͞Εͨ1)1Λͭͬͯ͘ΈΔ͜ͱʹ͢Δ

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ΞδΣϯμ wQIQTSDΛϏϧυ͢Δ w1)1ͷൺֱԋࢉॲཧͷ࣮૷Λ୳͢ w1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ ڍಈΛมߋ͢Δ

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ΞδΣϯμ wQIQTSDΛϏϧυ͢Δ w1)1ͷൺֱԋࢉॲཧͷ࣮૷Λ୳͢ w1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ ڍಈΛมߋ͢Δ

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QIQTSDΛϏϧυ͢Δ (PPHMFݕࡧʮ1)14PVSDF$PEFʯ

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QIQTSDΛϏϧυ͢Δ 1)1ͷϥϯλΠϜ QIQTSD ͸(JU)VCʹ͋Δ IUUQTHJUIVCDPNQIQQIQTSD

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QIQTSDΛϏϧυ͢Δ 3&"%.&Λ΋ͱʹϏϧυͯ͠ΈΔ IUUQTHJUIVCDPNQIQQIQTSD

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QIQTSDΛϏϧυ͢Δ ಈ͍ͨʂ

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ΞδΣϯμ wQIQTSDΛϏϧυ͢Δ w1)1ͷൺֱԋࢉॲཧͷ࣮૷Λ୳͢ w1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ ڍಈΛมߋ͢Δ

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1)1ͷൺֱԋࢉॲཧ࣮૷Λ୳͢ ίʔυશମͷߏ੒͕Θ͔͍ͬͯͳ͍ͷͰ Ͳ͔͜ΒݟΕ͹͍͍͔Θ͔Βͳ͍

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1)1ͷൺֱԋࢉॲཧ࣮૷Λ୳͢ ·ͨ·ͨ(PPHMFݕࡧ

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1)1ͷൺֱԋࢉॲཧ࣮૷Λ୳͢ ˠͰՃ͑ͨൺֱԋࢉͷมߋͷ3'$ͱͦͷ࣮૷Λݟ͚ͭͨ IUUQTXJLJQIQOFUSGDTUSJOH@UP@OVNCFS@DPNQBSJTPO

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1)1ͷൺֱԋࢉॲཧ࣮૷Λ୳͢ ;FOE[FOE@PQFSBUPSTDͷ[FOE@DPNQBSF ˞ IUUQTHJUIVCDPNQIQQIQTSDQVMM fi MFTEJ ff CFC ff FCBGFCBDEDGEGDBGDBEFF ˞ 1)1ͷίʔυͰ͸ಉ౳ͷؔ਺ͷ໊લ͸DPNQBSF@GVODUJPO

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ΞδΣϯμ wQIQTSDΛϏϧυ͢Δ w1)1ͷൺֱԋࢉॲཧͷ࣮૷Λ୳͢ w1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ ڍಈΛมߋ͢Δ

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1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ DPNQBSF@GVODUJPO ͷத਎ w ԋࢉର৅ͷܕΛൺֱ w ܕ͕ಛఆͷύλʔϯʹϚονͨ͠Β w ൺֱԋࢉΛͯ݁͠ՌΛSFTVMUʹ୅ೖ w ໭Γ஋ͱͯ͠46$$&44Λฦ͢ w ܕ͕ಛఆͷύλʔϯʹϚον͠ͳ͚Ε͹ɺԿΒ͔ ͷม׵Λࢪͯ͠ɺվΊͯܕΛൺֱ

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1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ DPNQBSF@GVODUJPO ͷத਎ IUUQTHJUIVCDPNQIQQIQTSDCMPCECFBE ff CGBDECDBFBGBGE;FOE[FOE@PQFSBUPSTD--

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1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ DPNQBSF@GVODUJPO Λվ଄ w ܕ͕ಛఆͷύλʔϯʹϚονͨ͠Β w ৽͍͠DBTFΛ௥Ճͯ͠ΈΔ w ˠຊདྷͱ͸ҧ͏ڍಈʹͳΔ

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1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ DPNQBSF@GVODUJPO Λվ଄ USVFͱจࣈྻΛൺֱ ӈลͷํ͕େ͖͍ͱ͢Δ IUUQTHJTUHJUIVCDPNZBNNFSKQBCGGEFFDEEBFEEFGC

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1)1ͷൺֱԋࢉॲཧΛյͯ͠ΈΔ DPNQBSF@GVODUJPO Λվ଄ յͤͨʂ IUUQTHJTUHJUIVCDPNZBNNFSKQBCGGEFFDEEBFEEFGC

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தࢁܚ༞ ΍Μ·ʔ ൺֱԋࢉΛյͯ͠ΈΔ 1)15FDI$BGF1)1FSͷͨΊͷʮ1)1ΧϯϑΝϨϯεʯΛޠΓ߹͏

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தࢁܚ༞ ΍Μ·ʔ ൺֱԋࢉΛյͯ͠ΈΔ 1)15FDI$BGF1)1FSͷͨΊͷʮ1)1ΧϯϑΝϨϯεʯΛޠΓ߹͏ յͤͨʂ