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1)1ͷυΩϡϝϯτΛಡΜͰ 1)1ͷ͜ͱΛ΋ͬͱ஌Ζ͏ খ઒༤େ!pWFTUS 1 PHP BLT #3

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খ઒༤େ (͓͕Θ͔ͭͻΖ) @fivestr Racing Driver (Amateur) Author of "Perfect PHP" CTO at Ancar Inc. 2

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Έͳ͞Μ1)1ͷ࠷৽ಈ޲͸νΣοΫͯ͠·͔͢ʁ w 1)1ͰԿ͕৽͘͠ͳ͔ͬͨ w ࠓޙͲͷΑ͏ͳػೳ͕௥Ճ͞ΕΔ͔ 3

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1)1 w εΧϥʔλΠϓώϯτ w ϦλʔϯλΠϓώϯτ w ԋࢉࢠ /VMM߹ମԋࢉࢠ w ԋࢉࢠ εϖʔεγοϓԋࢉࢠ w ແ໊Ϋϥε 4

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1)1&SSPS w 5ISPXBCMF w &SSPS w &YDFQUJPO w ͪͳΈʹ#BTF&YDFQUJPOͰ͸ͳ͘ͳΓ·ͨ͠ 5

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use Entity\{Article, Author, Comment}; 6

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ҠߦυΩϡϝϯτΛಡΈ·͠ΐ͏ w <1)1Y͔Β1)1Y΁ͷҠߦ>
 IUUQQIQOFUNBOVBMKBNJHSBUJPOQIQ w ֤ϝδϟʔϚΠφʔόʔδϣϯ͝ͱʹ
 ҠߦυΩϡϝϯτ͕͋Γ·͢ w w υΩϡϝϯτͷτοϓ͔ΒḷΕ·͢ 7

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ҠߦυΩϡϝϯτ͍͢͝ w جຊతʹ͢΂ͯͷมߋ͕·ͱΊΒΕ͍ͯ·͢ w ͔͠΋͍͍ͩͨ຋༁͞Ε͍ͯ·͢ w NUBLBHJ͞Μຊ౰ʹ͋Γ͕ͱ͏ 8

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ࠓޙͷಈ͖͸Ͳ͏΍ͬͯݟ͍͚ͯ͹͍͍ͷʁ w ҠߦυΩϡϝϯτΛಡΊ͹ϦϦʔε͞Εͨ
 ৘ใ͸Θ͔ΔΑ͏ʹͳΓ·ͨ͠ w ͜Ε͔Β௥Ճ͞ΕΔػೳͱ͔͸
 Ͳ͏΍ͬͯ஌Ε͹Α͍ͷͰ͠ΐ͏͔ 9

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1)13'$ w 3'$ͷϖʔδΛݟΔͱࠓޙͷಈ͖Λ
 νΣοΫͰ͖·͢ w IUUQTXJLJQIQOFUSGD 10

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3'$ͷಈ͖ w %SBGU%JTDVTTJPO7PUJOH w "DDFQUFE*NQMFNFOUBUJPO w %FDMJOF w ౤ථͷ݁Ռͷࢍ੒͕ͳ͍ͱ٫Լ͞ΕΔ 11

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*NQMFNFOUFE 12

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<>7PJE3FUVSO5ZQF w WPJE ໭Γ஋͕ͳ͍ ΛϦλʔϯ
 λΠϓώϯτ͕ఆٛͰ͖ΔΑ͏ʹ 13

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function process($data) :void { ...
 } 14

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<>4VQQPSU$MBTT$POTUBOU7JTJCJMJUZ w Ϋϥεఆ਺ʹΞΫηεम০ࢠΛ
 ઃఆͰ͖ΔΑ͏ʹ͢Δ 15

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class Foo { private const BAR = 'baz'; } 16

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"DDFQUFE 1FOEJOH*NQMFNFOUFE 17

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"MMPXTQFDJGZJOHLFZTJOMJTU w MJTU Ͱ࿈૝഑ྻͷΩʔΛࢦఆͯ͠
 ల։Ͱ͖ΔΑ͏ʹ͢Δ 18

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list( 'type' => $type, 'value' => $value, ) = $attrs; 19

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7PUJOH 20

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(FOFSBMJ[FTVQQPSUPGOFHBUJWFTUSJOHP⒎TFUT w จࣈྻͷΦϑηοτࢦఆʹϚΠφεͷ஋Λ
 ࢦఆͰ͖ΔΑ͏ʹ͢Δ w TVCTUSͳͲؔ਺Ͱ͸αϙʔτ͞Ε͍ͯͨ w ͍·ͷͱ͜Ζ൓ର͸Ͱ͍ͯͳ͍ͷͰ௨Γͦ͏ 21

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$str = 'abcdef'; var_dump($str[-2]); // => string(1) "e" 22

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6OEFS%JTDVTTJPO 23

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5SBJUTXJUIJOUFSGBDFT w τϨΠτʹΠϯλʔϑΣΠεΛ
 ࣮૷Ͱ͖ΔΑ͏ʹ͢Δ w ͢͹Β͍͠ w ͥͻ࣮૷͍͖͍ͯͨͩͨ͠ 24

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trait LoggerInjectTrait implements LoggerAwareInterface { protected $logger; /** @Inject */ public function setLogger(LoggerInterface $logger) { $this->logger = $logger; } } 25

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%FDMJOF 26

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1SPQFSUZ"DDFTTPST4ZOUBY w ΫϥεͷϓϩύςΟͷΞΫηαఆٛ w ΊͬͪΌཉ͔ͬͨ͠ͷʹͳΜͰ 27

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$MBTT.FUBEBUB "OOPUBUJPOT w ΞϊςʔγϣϯͷωΠςΟϒαϙʔτ͸
 ٫Լ͞Ε͍ͯΔ w %PDίϝϯτͷΞϊςʔγϣϯΛѻ͏ ʮ"OOPUBUJPOTJOEPDCMPDLʯ΋
 *OBDUJWFʹͳ͍ͬͯΔ 28

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·ͱΊΔͱ 29

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1)1υΩϡϝϯτΛಡ΋͏ w ҠߦΨΠυΛಡΉͱϦϦʔεͷ಺༰͕
 ೺ѲͰ͖·͢ w 3'$ΛಡΉͱࠓޙͷػೳ௥ՃͳͲͷಈ޲Λ
 ݟΔ͜ͱ͕Ͱ͖·͢ 30

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͍͞͝ʹ 31

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1)1ΤϯδχΞͱ J04ΤϯδχΞͱ "OESPJEΤϯδχΞͱ σβΠφʔͱ ͱ΋͔͘Ұॹʹಇ͍ͯ͘ΕΔํΛืू͍ͯ͠·͢ʂʂ 32