PHPのstreamで遊ぶ

#phpblt 4回目で話したネタです

Transcript

1. STREAMͰ༡Ϳ
   PHPBLT#4
   

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2. ͓લͩΕΑʁ
   Hiraku
   ▸ composerʹจ۟ݴͬͯΔਓ
   ▸ ޫ͕஗͍ͱจ۟ݴͬͯΔਓ
   ▸ PHPerྺ8೥͙Β͍
   

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3. STREAM
   ҙࣝͯ͠Δʁ
   

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4. PHPʹ͓͚Δ
   STREAM
   

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5. fopen, fclose, freadͳͲ
   CݴޠͰॻ͍ͯ͋Δ෦෼
   SplFileObject, file_get_contents
   ετϦʔϜ (file://, php://, http://ͳͲ)
   ਂ෵
   PHPer͕ීஈ

   ৮ͬͯΔॴ
   ΩϥΩϥͨ͠
   ΍ͭ
   

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6. ΋͏ͪΐͬͱਅ໘໨ͳઆ໌
   PHPͷSTREAMͱ͸
   ▸ UNIXͷϑΝΠϧهड़ࢠ(FD)ʹ૬౰͢ΔPHPػೳ
   ▸ resourceܕͷҰछ
   ▸ is_resource($fp) === true
   ▸ get_resource_type($fp) === 'stream'
   ▸ fopen()ͰऔΕΔ΄͔ɺSTDOUT΍STDIN΋͜ͷ஥ؒ
   

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7. ίʔυͰݴ͑͹
   $fs = fopen('hoge.txt', 'r');
   //↑これがストリームリソース
   $file = new SplFileObject('hoge.txt');
   //↑内部的にはストリームリソースが存在している
   

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8. ৭ʑछྨ͕͋Δ
   ▸ ϑΝΠϧύεͷઌ಄ͷ"file:// ..."ͷ෦෼Ͱ෼ذ͍ͯ͠Δ
   ▸ লུ͢Δͱfile://ͷҙຯʹͳΔ
   ▸ http:// ͱ͔ php:// ͱ͔ data:// ΋͋ΔΑ
   

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9. ΈΜͳҙࣝͤͣʹ

   ࢖͍ͬͯΔ͸ͣʂ
   

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10. PHPͷ"ετϦʔϜ"͕࣋ͭ
    ػೳ
    ϑΝΠϧγεςϜ

    Λந৅Խͨ͠΋ͷ
    ڊେͳσʔλΛѻ͑Δ
    ௨৴Λந৅Խ ฒߦॲཧ
    

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11. ໊લΑ͘ͳ͍ΑͶɻɻ
    ▸ Node.jsͷstreamsͱ͸ҧ͏
    ▸ σΟϨΫτϦͷ֓೦͕͋Δ
    ▸ ύΠϓͱ͔ιέοτͱ͔
    ▸ ඇಉظ͚ͨ͠Ε͹ࣗ෼Ͱॻ͘
    ▸ όΠφϦྻ͔͠ѻ͑ͳ͍
    

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12. STREAMͰ༡Ϳ
    

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13. fopen, fclose, freadͳͲ
    CݴޠͰॻ͍ͯ͋Δ෦෼
    SplFileObject, file_get_contents
    ετϦʔϜ (file://, php://, http://ͳͲ)
    ਂ෵
    PHPer͕ීஈ

    ৮ͬͯΔॴ
    ΩϥΩϥͨ͠
    ΍ͭ
    

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14. =حົͳ͜ͱ͕Ͱ͖Δ
    ਂ෵ʹ͍ۙͱ͍͏͜ͱ͸
    

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15. STREAMͰ༡Ϳ
    ωλ1
    

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16. ͝ଘ஌Ͱ͠ΐ͏͔
    ૊ΈࠐΈͷstream͸ফͤΔ
    ▸ stream_wrapper_unregisterؔ਺
    ▸ Ϋϥε΍ؔ਺͸(ී௨)ফͤͳ͍͚Ͳɺ

    stream͸ඪ४ػೳͰফͤΔ
    PHPͰػೳΛ
    ফͤΔͷ͸ΊͣΒ͍͠
    

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17. ͼͬ͘Γ͢Δ΄ͲPHP͕໾ʹཱͨͳ͘ͳΔtips
    stream_wrapper_unregister('file')
    ▸ file://ͷొ࿥Λফ͢
    ▸ require 'hoge.php'; Ͱ͖ͳ͘ͳΔ
    ▸ file_get_contents('hoge.php'); Ͱ͖ͳ͘ͳΔ
    Կ΋Ͱ͖ͳ͍ʂ
    

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18. ΍ͬͯΈΔ
    $ php -a
    Interactive shell
    php > stream_wrapper_unregister('file');
    php > echo file_get_contents('hoge.txt');
    PHP Warning: file_get_contents(): file:// wrapper is disabled in the server
    configuration in php shell code on line 1
    PHP Stack trace:
    PHP 1. {main}() php shell code:0
    PHP 2. file_get_contents() php shell code:1
    

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19. STREAMͰ༡Ϳ
    ωλ2
    

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20. ͝ଘ஌Ͱ͠ΐ͏͔
    ফͨ͠stream͸ࣗ࡞൛ʹஔ͖׵͑ΒΕΔ
    ▸ stream_wrapper_registerؔ਺
    ▸ streamWrapperͬΆ͍ΫϥεΛPHPͰ࣮૷ͯ͠ొ࿥
    ▸ http://php.net/manual/ja/class.streamwrapper.php
    stream૚ͰͷϞοΫԽ
    

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21. class Aori
    {
    private $finished = false;
    function stream_open($path, $mode, $options, &$opened_path) {
    return true;
    }
    function stream_read(int $count) {
    if ($this->finished) {
    return false;
    }
    $this->finished = true;
    return 'うるせーバーカ';
    }
    function stream_eof() {
    return $this->finished;
    }
    function stream_stat() {
    return [];
    }
    }
    stream_wrapper_unregister('file');
    stream_wrapper_register('file', 'Aori');
    

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22. php > require 's1.php';
    php > require 's1.php';
    うるせーバーカ
    php > require 's';
    うるせーバーカ
    php > echo file_get_contents('hoge');
    うるせーバーカ
    ἤͬͯ͘ΔPHP͕Ͱ͖ͨ
    

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23. STREAMͷϞοΫԽʂʂͬͯॻ͍͚ͨͲ
    ▸ requireͱ͔ͷΫϥεಡΈࠐΈ·ͰϞοΫԽ͞ΕͪΌ͏
    ▸ ݩͷfile://͕࢖͑ͳ͘ͳΔ
    ▸ ͭΑ͗ͯ͢໾ʹཱͨͳ͍…
    

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24. STREAMͰ༡Ϳ
    ωλ3
    

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25. PHP PREPROCESSOR
    

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26. ωλͩͬͨΜͰ͚͢Ͳ
    ͓୊
    ▸ setter/getterΛ୹͘ॻ͖͍ͨ...
    ▸ ϚδοΫϝιου͸νϟϥ͍͔Βݏ
    

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27. ϚΫϩͬΆ͍΋ͷΛ࡞Δ
    ▸ PHPͷίʔυΛు͘PHPͷίʔυΛॻ͘
    ▸ 1ճ࣮ߦͨ݁͠ՌΛrequire/file_get_contentsʹ౉͢
    ▸ ͱ͍͏ͷΛstreamWrapperͰ࡞Δ
    

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28. σϞ
    

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29. STREAM
    ໘ന͍Αʂ
    

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