#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〜

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

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

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⏳estimate: 0 1 /25

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⏳estimate: 0 1 /25

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  ⏳estimate: 0 1 /25

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

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

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

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

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§1

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ϓϩάϥϛϯάݴޠ͸ͳͥʮΤϥʔʯΛݴͬͯ͘Δͷʁ = ⏳estimate: 1 2 /25

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PHP Software Developers       ⏳estimate: 1 2 /25

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PHP Software Developers       ૝͍ ⏳estimate: 2 /25

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⏳estimate: 2 /25

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⏳estimate: 2 /25

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

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

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

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PHP 👀 ⏳estimate: 2~3 /25

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

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

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

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  ⏳estimate: 3 /25

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Τϥʔɺ͑Βʙ͍👏 : : ⏳estimate: 3~4 /25

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§2 PHP

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§2 PHP .1 .2 PHP

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Τϥʔʹ͸ʮఔ౓ʯ͕͋Δͧ ( )   ⏳estimate: 4 /25

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

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৘ใ͕෼ྨ͞Ε͍ͯΔͱศརͰ͢Ͷʂ ⏳estimate: 5 /25

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

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§2 PHP .1 .2 PHP ⏳estimate: 5~6 /25

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PHPʹ͓͚ΔΤϥʔఆ਺(ΤϥʔϨϕϧ) IUUQTXXXQIQOFUNBOVBMKBFSSPSGVODDPOTUBOUTQIQ

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PHPͷΤϥʔܥ౷

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PHPͷΤϥʔܥ౷ ͦΕͧΕɺ఻͑Α͏ͱ͍ͯ͠Δҙਤ͕ҧͬͨΓ   ΋ͨΒ݁͢Ռ͕ҧ͏Μͩͳʙ ۠ผ͕͋ΔΜͩͳʙ ⏳estimate: 6 /25

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

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

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E_WARNING / ܯࠂ ( ) ( ) URL

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E_NOTICE / ஫ҙ

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§3

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§3 .1 .2 ⏳estimate: 7 /25

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ྑ͘ͳͦ͞͏ͳίʔυͱ͍͏ͷ͕͋Δ ⏳estimate: 7 /25

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

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

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

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

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

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

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

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ΤϥʔͱՄೳੑ ❌   ⭕ ⏳estimate: 8~9 /25

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͜ͷίʔυ͸ո͍͕͠ɾɾɾ ⏳estimate: 9 /25

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͜ͷίʔυ͸ո͍͕͠ɾɾɾ PHP ⏳estimate: 9~10 /25

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§3 .1 .2 ⏳estimate: 9~10 /25

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Α͘ͳͦ͞͏ͳίʔυΛආ͚ΔͨΊʹ ⏳estimate: 10 /25

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

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࣮ྫʂϓϩάϥϛϯά ( )   ⏳estimate: 10~11 /25

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࣮ྫʂPHP ( )

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

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

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ίϨ͸͋ͳͨͷ௚؍ʹ߹͏ʁ E_ERROR

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ΤϥʔʹࣖΛ܏͚͍ͯ͜͏ʙ ⏳estimate: 11 /25

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ΤϥʔʹࣖΛ܏͚͍ͯ͜͏ʙ       ⏳estimate: 11~12 /25

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§4 PRO

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Τϥʔɺා͍Ͱ͔͢ʁ ( ) ⏳estimate: 12 /25

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ΤϥʔͷPRO͕ɺ஌͍ͬͯΔ͜ͱ     ( )     ⏳estimate: 12~13 /25

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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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όά͸ʮൟ৩ʯ͢Δ 1 1 [ग़య]   ᴷ Shore, James, Warden, Shane, ฏು ݈ࣇ, ໦Լ ࢙඙, ࡫Ҫ ਸ࢘   ΞʔτɾΦϒɾΞδϟΠϧσϕϩοϓϝϯτ : ૊৫Λ੒ޭʹಋ͘ΤΫετϦʔϜϓϩάϥϛϯά P169

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Τϥʔ͕ڭ͑ͯ͘ΕΔ͜ͱɾ͘Εͳ͍͜ͱ   ⏳estimate: 13~14 /25

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

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

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ผͷྫ: ߏจΤϥʔɺ͜ΕͩͬͨΒͲ͏ݟ͑Δʁ class{}

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

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Τϥʔͱ஥ྑ͘ͳΔʹ͸ PRO ⏳estimate: 14~15 /25

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

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Τϥʔͱ஥ྑ͘ͳΔͨΊͷίπ΋௫Έ·͠ΐ͏ʂ   ( ) = ( ) ⏳estimate: 16 /25

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§5 PHP

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§5 PHP .1 .2 ⏳estimate: 16~17 /25

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ϓϩάϥϛϯάʹͱͬͯΤϥʔ͸ॏཁ ⏳estimate: 16~17 /25

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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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ᐆດ͞ͱͷઓ͍ PHP ⏳estimate: 17~18 /25

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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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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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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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§5 PHP .1 .2

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͜Ε͔ΒͲ͏ͳΓͦ͏ʁ NOTICE   PHP Error WARNING (DEPRECATED ) TypeError/ValueError

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͜Ε͔ΒͲ͏͍ͯ͘͠ʁ PHP7.0 ⏳estimate: 20 /25

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