PHP のドキュメントを読んで PHP のことをもっと知ろう

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

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

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

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

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

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

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

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

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

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

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

*NQMFNFOUFE 12

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

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

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

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

"DDFQUFE 1FOEJOH*NQMFNFOUFE 17

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

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

7PUJOH 20

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

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

6OEFS%JTDVTTJPO 23

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

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

%FDMJOF 26

1SPQFSUZ"DDFTTPST4ZOUBY w ΫϥεͷϓϩύςΟͷΞΫηαఆٛ w ΊͬͪΌཉ͔ͬͨ͠ͷʹͳΜͰ 27

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

·ͱΊΔͱ 29

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

͍͞͝ʹ 31

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

PHP のドキュメントを読んで PHP のことをもっと知ろう

PHP のドキュメントを読んで PHP のことをもっと知ろう

Katsuhiro OGAWA

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

খ઒༤େ (͓͕Θ͔ͭͻΖ) @ﬁvestr Racing Driver (Amateur) Author of "Perfect PHP"

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

1)1 w εΧϥʔλΠϓώϯτ w ϦλʔϯλΠϓώϯτ w ԋࢉࢠ /VMM߹ମԋࢉࢠ w

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

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

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

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

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

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

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

*NQMFNFOUFE 12

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

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

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

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

"DDFQUFE 1FOEJOH*NQMFNFOUFE 17

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

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

7PUJOH 20

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

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

6OEFS%JTDVTTJPO 23

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

trait LoggerInjectTrait implements LoggerAwareInterface { protected $logger; /** @Inject */

%FDMJOF 26

1SPQFSUZ"DDFTTPST4ZOUBY w ΫϥεͷϓϩύςΟͷΞΫηαఆٛ w ΊͬͪΌཉ͔ͬͨ͠ͷʹͳΜͰ 27

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

·ͱΊΔͱ 29

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

͍͞͝ʹ 31

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