#phpcon 良いコードを書けるようになるコツは「エラーを気にする」 〜プログラマにとってエラーとは何なのか〜

Transcript

1. 

   PHP Conference 2023
   
   
   Hideki Kinjyo
   
   
   GitHub: o0h / Twitter: @o0h_
   

   

   [ൃද൛]
   

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2. ࣗݾ঺հ
   /
   GitHub: @o0h / X: @o0h_
   FW CakePHP
   
   
   

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3. ⏳estimate: 0 1 /25
   

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4. ⏳estimate: 0 1 /25
   

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5. 

   ⏳estimate: 0 1 /25
   

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6. ҧ͏ʂʂ
   Τϥʔ͸ఢ͡Όͳ͍ɺ
   ༑ୡͳΜͩʂʂ
   ⏳estimate: 1 /25
   

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7. ͜ΜͳࣄΛ࿩͍͖ͯ͠·͢
   PHP
   
   ⏳estimate: 1 2 /25
   ˒খ͞ͳએ఻ίʔφʔ˒
   

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8. ͜Μͳ΋ͷΛ࣋ͬͯؼͬͯ΋Β͍͍ͨ
   PHP
   
   ⏳estimate: 1 2 /25
   

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9. ͓͠ͳ͕͖
   1.
   2. PHP
   3.
   4. PRO
   5. PHP
   
   ⏳estimate: 1 2 /25
   

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10. §1
    

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11. ϓϩάϥϛϯάݴޠ͸ͳͥʮΤϥʔʯΛݴͬͯ͘Δͷʁ
    =
    
    ⏳estimate: 1 2 /25
    

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12. PHP Software Developers
    

    

    

    ⏳estimate: 1 2 /25
    

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13. PHP Software Developers
    

    

    

    ૝͍
    ⏳estimate: 2 /25
    

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14. ⏳estimate: 2 /25
    

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15. ⏳estimate: 2 /25
    

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16. Τϥʔͷ͋Δੈքɺͳ͍ੈքɾɾɾͲ͕ͬͪྑ͍Ͱ͔͢ʁ
    :
    31
    :
    :
    :
    
    ⏳estimate: 2~3 /25
    

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17. Τϥʔͷ͋Δੈքɺͳ͍ੈքɾɾɾͲ͕ͬͪྑ͍Ͱ͔͢ʁ
    (= )
    =>
    =>
    =>
    
    ⏳estimate: 2~3 /25
    

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18. Τϥʔͷ͋Δੈքͷํ͕ɺ༏͍͠ੈք
    2
    
    ⏳estimate: 2~3 /25
    

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19. PHP 👀
    ⏳estimate: 2~3 /25
    

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20. ྫ͑͹sprintf()ͷྫ
    (%
    )
    switch
    
    src:
    IUUQTHJUIVCDPNQIQQIQTSDCMPCQIQFYUTUBOEBSEGPSNBUUFE@QSJOUD--
    

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21. ྫ͑͹sprintf()ͷྫ
    case (default )
    
    ⏳estimate: 3 /25
    

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22. ྫ͑͹sprintf()ͷྫ
    
    src:
    IUUQTHJUIVCDPNQIQQIQTSDCMPCQIQFYUTUBOEBSEGPSNBUUFE@QSJOUD--
    (% )
    

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23. 

    ⏳estimate: 3 /25
    

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24. Τϥʔɺ͑Βʙ͍👏
    :
    :
    
    ⏳estimate: 3~4 /25
    

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25. §2
    PHP
    

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26. §2 PHP
    .1
    .2 PHP
    

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27. Τϥʔʹ͸ʮఔ౓ʯ͕͋Δͧ
    ( )
    

    
    ⏳estimate: 4 /25
    

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28. [ࣸਅ]
    
    
    (্) ৅ҹ ενʔϜࣜՃ࣪ث EE-RQ35ܕ/EE-RQ50ܕ औѻઆ໌ॻ
    
    
    (Լ) ΞΠϦεΦʔϠϚ ਅۭอଘϑʔυγʔϥʔ VPF-385T औѻઆ໌ॻ
    
    
    ࢀߟ: Ոి඼Λ҆શʹ࢖͏ͨΊͷϚʔΫʛҰൠࡒஂ๏ਓՈి੡඼ڠձ https://aeha.or.jp/safety/mark/index.html
    ৘ใͷ෼ྨͷྫ: ՈిͷϚχϡΞϧ
    :
    :
    
    

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29. ৘ใͷ෼ྨͷྫ: ՈిͷϚχϡΞϧ
    
    [ࣸਅ]
    
    
    ৅ҹ ενʔϜࣜՃ࣪ث EE-RQ35ܕ/EE-RQ50ܕ औѻઆ໌ॻ
    

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30. ৘ใ͕෼ྨ͞Ε͍ͯΔͱศརͰ͢Ͷʂ
    
    ⏳estimate: 5 /25
    

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31. ͲΜͳʮఔ౓ʯ͕͋Δʁ
    :
    :
    ( ):
    :
    
    ⏳estimate: 5~6 /25
    

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32. §2 PHP
    .1
    .2 PHP
    ⏳estimate: 5~6 /25
    

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33. PHPʹ͓͚ΔΤϥʔఆ਺(ΤϥʔϨϕϧ)
    
    IUUQTXXXQIQOFUNBOVBMKBFSSPSGVODDPOTUBOUTQIQ
    

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34. PHPͷΤϥʔܥ౷
    
    

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35. PHPͷΤϥʔܥ౷
    
    ͦΕͧΕɺ఻͑Α͏ͱ͍ͯ͠Δҙਤ͕ҧͬͨΓ
    

    ΋ͨΒ݁͢Ռ͕ҧ͏Μͩͳʙ ۠ผ͕͋ΔΜͩͳʙ
    
    ⏳estimate: 6 /25
    

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36. PHPͷΤϥʔͨͪʙ͜Ε͚ͩ͸֮͑Α͏ʙ
    E_ERROR => [ ] PHP
    E_WARNING => [ ] PHP
    E_NOTICE => [ ] PHP
    
    ⏳estimate: 6 /25
    

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37. E_ERROR / ॏେ
    (Throwable)
    
    ⏳estimate: 6~7 /25
    

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38. E_WARNING / ܯࠂ
    ( )
    ( ) URL
    
    

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39. E_NOTICE / ஫ҙ
    
    

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40. §3
    

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41. §3
    .1
    .2
    ⏳estimate: 7 /25
    

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42. ྑ͘ͳͦ͞͏ͳίʔυͱ͍͏ͷ͕͋Δ
    
    ⏳estimate: 7 /25
    

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43. ᐆດ͞ʹ͍ͭͯ: shin1x1͞Μʮ੍໿ͷྗʯ
    
    https://speakerdeck.com/shin1x1/restricting-states
    ⏳estimate: 7~8 /25
    

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44. ᐆດ͞ʹ͍ͭͯ: shin1x1͞Μʮ੍໿ͷྗʯ
    
    https://speakerdeck.com/shin1x1/restricting-states
    ⏳estimate: 7~8 /25
    

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45. ᐆດ͞ʹ͍ͭͯ: shin1x1͞Μʮ੍໿ͷྗʯ
    
    https://speakerdeck.com/shin1x1/restricting-states
    ⏳estimate: 7~8 /25
    

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46. ᐆດ͞ʹ͍ͭͯ: shin1x1͞Μʮ੍໿ͷྗʯ
    
    https://speakerdeck.com/shin1x1/restricting-states
    ⏳estimate: 8 /25
    

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47. ᐆດ͞ʹ͍ͭͯ: t-wada͞Μͷʮ༧๷ʹউΔ๷ޚͳ͠ʯ
    
    https://speakerdeck.com/twada/growing-reliable-code-phperkaigi-2022
    ⏳estimate: 8 /25
    

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48. ᐆດ͞ʹ͍ͭͯ: t-wada͞Μͷʮ༧๷ʹউΔ๷ޚͳ͠ʯ
    
    https://speakerdeck.com/twada/growing-reliable-code-phperkaigi-2022
    ⏳estimate: 8 /25
    

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49. ྑ͘ͳ͍ίʔυ͕͜͏ͯ͠ੜ·ΕΔͧ
    ( )
    
    ⏳estimate: 8~9 /25
    

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50. ΤϥʔͱՄೳੑ
    ❌
    

    ⭕
    
    ⏳estimate: 8~9 /25
    

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51. ͜ͷίʔυ͸ո͍͕͠ɾɾɾ
    
    ⏳estimate: 9 /25
    

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52. ͜ͷίʔυ͸ո͍͕͠ɾɾɾ
    PHP
    
    ⏳estimate: 9~10 /25
    

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53. §3
    .1
    .2
    ⏳estimate: 9~10 /25
    

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54. Α͘ͳͦ͞͏ͳίʔυΛආ͚ΔͨΊʹ
    
    ⏳estimate: 10 /25
    

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55. Τϥʔɺcase-by-case
    ( ) ( )
    
    ⏳estimate: 10 /25
    

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56. ࣮ྫʂϓϩάϥϛϯά
    ( )
    

    
    ⏳estimate: 10~11 /25
    

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57. ࣮ྫʂPHP
    ( )
    
    

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58. ࣮ྫʂPHP
    :
    

    include E_WARNING
    require E_ERROR
    

    https://www.php.net/manual/ja/function.include.php
    
    ⏳estimate: 10~11 /25
    

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59. ΤϥʔϨϕϧ͸ओ؍తʹܾ·Δ(ଆ໘΋͋Δ)
    
    ⏳estimate: 11 /25
    

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60. ίϨ͸͋ͳͨͷ௚؍ʹ߹͏ʁ
    E_ERROR
    
    

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61. ΤϥʔʹࣖΛ܏͚͍ͯ͜͏ʙ
    
    ⏳estimate: 11 /25
    

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62. ΤϥʔʹࣖΛ܏͚͍ͯ͜͏ʙ
    
 

    

    
    ⏳estimate: 11~12 /25
    

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63. §4
    PRO
    

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64. Τϥʔɺා͍Ͱ͔͢ʁ
    ( )
    
    ⏳estimate: 12 /25
    

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65. ΤϥʔͷPRO͕ɺ஌͍ͬͯΔ͜ͱ
    
 

    ( )
    

    

    
    ⏳estimate: 12~13 /25
    

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66. Τϥʔ͕࣍ͷʮ૝ఆ֎ʯʮᐆດʯΛݺͿ
    (
    )
    
    [ग़య]
    

    ᴷAndreas Zeller, தా लج, ࠓా ণ޺, େؠ ঘ޺, ஛ా ߳බ, ٶݪ ٱඒࢠ, फܗ ࣿ৫
    

    σόοάͷཧ࿦ͱ࣮ફ ―ͳͥϓϩάϥϜ͸͏·͘ಈ͔ͳ͍ͷ͔ P3 - P4
    

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67. όά͸ʮൟ৩ʯ͢Δ
    1 1
    
    [ग़య]
    

    ᴷ Shore, James, Warden, Shane, ฏು ݈ࣇ, ໦Լ ࢙඙, ࡫Ҫ ਸ࢘
    

    ΞʔτɾΦϒɾΞδϟΠϧσϕϩοϓϝϯτ : ૊৫Λ੒ޭʹಋ͘ΤΫετϦʔϜϓϩάϥϛϯά P169
    

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68. Τϥʔ͕ڭ͑ͯ͘ΕΔ͜ͱɾ͘Εͳ͍͜ͱ
    

    
    ⏳estimate: 13~14 /25
    

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69. ͖ͬ͞ͷίʔυ: Կ͕ਖ਼͍͠ʁ
    
    $taxRate
    1.8
    fl
    oat
    0.8
    fl
    oat
    80(%) int
    ⏳estimate: 13~14 /25
    

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70. ผͷྫ: ߏจΤϥʔ
    ( )
    7 if{}
    if {} 🤮
    
    ⏳estimate: 13~14 /25
    

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71. ผͷྫ: ߏจΤϥʔɺ͜ΕͩͬͨΒͲ͏ݟ͑Δʁ
    class{}
    
    

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72. ผͷྫ: ߏจΤϥʔɺݟͨ໨ͰมΘΒͳ͍҆৺ײ
    
    ⏳estimate: 14 /25
    

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73. Τϥʔͱ஥ྑ͘ͳΔʹ͸
    PRO
    
    ⏳estimate: 14~15 /25
    

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74. Τϥʔ͸ఢ͡Όͳ͍ɺ༑ୡͳΜͩʂʂ →ͦͷ৺͸ʁ
    
    ⏳estimate: 15~16 /25
    

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75. Τϥʔͱ஥ྑ͘ͳΔͨΊͷίπ΋௫Έ·͠ΐ͏ʂ
    

    ( )
    =
    ( )
    
    ⏳estimate: 16 /25
    

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76. §5
    PHP
    

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77. §5 PHP
    .1
    .2
    ⏳estimate: 16~17 /25
    

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78. ϓϩάϥϛϯάʹͱͬͯΤϥʔ͸ॏཁ
    
    ⏳estimate: 16~17 /25
    

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79. PHP͸Ͳ͏͖ͯͨ͠ʁˠΑ͘࿩୊ʹͳΔ΍ͭ
    PHP5 -> PHP7
    Throwable/Error
    E_STRICT : E_NOTICE, E_WARNING, E_DEPRECATED
    PHP7 -> PHP8
    warning -> Error
    PHP8 -> PHP9
    Error (8.2 Deprecated)
    Error
    
    

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80. ᐆດ͞ͱͷઓ͍
    PHP
    
    ⏳estimate: 17~18 /25
    

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81. ᐆດ͞ͱͷઓ͍
    E_WARNING/E_NOTICE Error throw
    E_NOTICE (7.4 )
    E_NOTICE php.ini these are warnings
    which often result from a bug in your code, but it's possible
    that it was intentional
    
    ⏳estimate: 17~18 /25
    

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82. php-src grep
    7.x NOTICE
    WARNING
    8.x
    WARNING
    E_NOTICE/
    

    E_WARNINGͷग़ݱ਺
    git --no-pager grep E_NOTICE -- 'ext/**/*.c' | wc -l
    

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83. RFCͳͲ
    PHP: rfc:engine_warnings
    

    https://wiki.php.net/rfc/engine_warnings
    PHP: rfc:consistent_type_errors
    

    https://wiki.php.net/rfc/consistent_type_errors
    Pull requests · php/php-src
    

    https://github.com/php/php-src/pulls?q=label%3A%22Warning+promotion%22
    PHP: rfc:unde
    fi
    ned_property_error_promotion
    

    https://wiki.php.net/rfc/unde
    fi
    ned_property_error_promotion
    PHP: rfc:unde
    fi
    ned_variable_error_promotion
    

    https://wiki.php.net/rfc/unde
    fi
    ned_variable_error_promotion
    
    

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84. §5 PHP
    .1
    .2
    

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85. ͜Ε͔ΒͲ͏ͳΓͦ͏ʁ
    NOTICE
    

    PHP
    Error WARNING
    (DEPRECATED )
    TypeError/ValueError
    
    

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86. ͜Ε͔ΒͲ͏͍ͯ͘͠ʁ
    PHP7.0
    
    ⏳estimate: 20 /25
    

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87. ͜Ε͔ΒͲ͏͍ͯ͘͠ʁ
    E_NOTICE/E_WARNING
    (`===` strict )
    PHPStan Psalm
    PHP
    
    ⏳estimate: 21 /25
    

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88. View Slide

89. Τϥʔͱ্ख͘෇͖߹͏ͱɺ೉͕͠͞ݮΔ
    PHP
    

    
    ⏳estimate: 21~22 /25
    

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91. ͓͠·͍ʂ
    ͓෇͖߹͍͍͖ͨͩ
    

    ͋Γ͕ͱ͏͍͟͝·ͨ͠
    

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