今こそ理解する PHPの日時計算 / Understand date manipulation of PHP

https://phpcon.php.gr.jp/2020/
PHP Conference Japan 2020 Re:born で発表する資料です。

資料中のURL
https://www.php.net/manual/ja/datetime.format.php
https://www.php.net/manual/ja/dateinterval.format.php
https://www.php.net/manual/ja/language.oop5.object-comparison.php

https://github.com/briannesbitt/Carbon
https://github.com/cakephp/chronos

https://t-wada.hatenablog.jp/entry/design-for-testability

Transcript

1. ࠓͦ͜ཧղ͢Δ
   1)1ͷ೔࣌ܭࢉ
   ʮ1)1$POGFSFODF+BQBO3FCPSOʯ
   IUUQTQIQDPOQIQHSKQ
   

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2. ࣗݾ঺հ
   w ࢁాɹ঵ʢ΍·ͩɹ͠ΐ͏ʣ
   w ίωώτגࣜձࣾͰαʔόʔαΠυΤϯδχ
   ΞΛ΍͓ͬͯΓ·͢ɻ
   w Ұ൪ಘҙͳͷ͸ɺ1)1Ͱ͸ͳ͘$44Ͱ͢ɻ
   

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3. ૣ଎Ͱ͕͢
   

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4. 1)1ͷ೔෇ܭࢉͬͯ
   Ͳ͏͢Δͷ͕ϕετͳΜͩΖ͏ɾɾʁ
   

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5. ʮQIQ೔෇ʯʮQIQ೔෇ܭࢉʯ
   Ͱݕࡧͨ͠ܦݧ͸͋Γ·ͤΜ͔ʁ
   

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6. TUSUPUJNFʁ
   EBUF EBUFUJNFʁ
   

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7. ࠓ೔ͷൃදͰɺ࣮૷ͷ໎͍Λ
   গ͠Ͱ΋ݮΒͤΕ͹خ͍͠Ͱ͢ɻ
   

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8. ຊ೔࿩͢͜ͱ
   w EBUFؔ਺ͱϑΥʔϚοτॻࣜʹ͍ͭͯ
   w %BUF5JNFΫϥεɺ%BUF5JNF*NNVUBCMFΫϥεʹ͍ͭͯ
   w ೔෇΍࣌ࠁͷϥΠϒϥϦʹ͍ͭͯ
   

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9. ͦΕͰ͸ɺຊฤελʔτͰ͢ɻ
   

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10. EBUFؔ਺ͱ
    ϑΥʔϚοτॻࣜ
    

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11. ·ͣ͸EBUFؔ਺ʹ͍ͭͯ஌Γ·͠ΐ͏
    

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12. EBUFؔ਺ʹ͍ͭͯ
    date (string $format [, int $timestamp = time()]) : string
    Ҿ਺ͷtimestampΛɺҾ਺ͷϑΥʔϚοτจࣈྻʢ$formatʣͰϑΥʔϚοτͯ͠ɺจࣈྻΛฦ͢ɻ
    echo date("Y-m-d H:i:s”); // 2020-12-12 15:55:00
    

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13. ͱ͜ΖͰϑΥʔϚοτจࣈྻͬͯʁ
    

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14. GPSNBUύϥϝʔλจࣈྻͱ͸ʁ
    w ͦͷ໊ͷ௨Γɺ೔෇ͷϑΥʔϚοτʹ༻͍Δɻ
    w ޙड़͢Δ%BUF5JNFɺ%BUF5JNF*NNVUBCMFΫϥεͰ΋࢖༻Մೳɻ
    w ೔ɺिɺ݄ɺ೥ɺ࣌ɺλΠϜκʔϯͳͲ༷ʑͳछྨ͕͋Δɻ
    ˠ࣍ϖʔδҎ߱Ͱઆ໌͍͖ͯ͠·͢ɻ
    ࢀߟIUUQTXXXQIQOFUNBOVBMKBEBUFUJNFGPSNBUQIQ
    

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15. GPSNBUύϥϝʔλจࣈྻʮ೔ʯᶃ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    %
    ࡾจࣈͷςΩετܗࣜ
    ͷ༵೔ɻ
    .POɺ4VO
    E
    ೋܻͷ਺ࣈͷ೔ɻ
    ઌ಄ʹθϩ͕ͭ͘ɻ
    ɺ
    K
    ೋܻͷ਺ࣈͷ೔ɻ
    ઌ಄ʹθϩ͕͔ͭͳ͍ɻ
    ɺ
    Mʢ-ͷখจࣈʣ ϑϧεϖϧܗࣜͷ༵೔ɻ
    4VOEBZɺ.POEBZɺ
    5VFTEBZɾɾ
    

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16. GPSNBUύϥϝʔλจࣈྻʮ೔ʯᶄ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    4
    ӳޠܗࣜͷং਺ɻ
    ΞϧϑΝϕοτจࣈɻ
    TUɺOEɺSEɺUI
    /
    *40ܗࣜͰ
    ਺஋දݱ͞Ε༵ͨ೔ɻ
    ʢ݄༵೔ʣʙʢ೔༵೔ʣ
    Xʢ8ͷখจࣈʣ ༵೔ͷ਺஋ ʢ೔༵೔ʣʙʢ౔༵೔ʣ
    ͉ʢ;ͷখจࣈʣ
    ೥ؒͷ௨ࢉ೔ɻ
    θϩ͔Β࢝·Δɻ
    ʙ
    ˞Ӟ೥ͷ৔߹͸·Ͱ
    

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17. GPSNBUύϥϝʔλจࣈྻʮिʯ
    LP
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    8ʢେจࣈʣ
    *40ܗࣜͰ
    ݄༵೔࢝·Γͷि൪߸
    ʢ೥ͷୈि໨ʣ
    ※ ISO-8601ܗࣜͷ࢓༷ʹบ͕͋Γ·͢ɻ࣍ͷεϥΠυͰղઆ͠·͢ɻ
    

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18. िͱ༵೔ͷܾΊ͝ͱʢ*40ʣ
    w ͢΂ͯͷि͸࢝·Γ͸ʮ݄༵೔ʯ
    w ͋Δ೥ͷ࠷ॳͷि͸ͦͷ೥ͷ࠷ॳͷ໦༵೔ΛؚΉिɻ
    w ྫ͸ʮՐ༵೔ʯɻि൪߸͸͍ͭ͘ʁ
    w ೥݄೔͸ʮ౔༵೔ʯ
    

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19. GPSNBUύϥϝʔλจࣈྻʮ݄ʯᶃ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    ' ϑϧεϖϧͷ݄ɻ +BOVBSZʙ%FDFNCFS
    . จࣈܗࣜͷ݄ɻ +BOʙ%FD
    

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20. GPSNBUύϥϝʔλจࣈྻʮ݄ʯᶄ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    N
    ਺ࣈͰ݄Λදݱɻ
    ઌ಄ʹθϩ͕ͭ͘ɻ
    ʙ
    O
    ਺ࣈͰ݄Λදݱɻ
    ઌ಄ʹθϩ͕͔ͭͳ͍ɻ
    ʙ
    U ࢦఆ݄ͨ͠ͷ݄਺ ɺɺɺ
    

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21. GPSNBUύϥϝʔλจࣈྻʮ೥ʯ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    : ܻͷ਺ࣈͷ೥ ɺ
    Z ܻͷ਺ࣈͷ೥ ɺ
    - Ӟ೥Ͱ͋Δ͔Ͳ͏͔
    ͳΒӞ೥
    ͳΒӞ೥Ͱ͸ͳ͍
    Pʢ0ͷখจࣈʣ
    *40ܗࣜͷि൪߸
    ͔Βܾఆ͞Εͨ೥
    ɺ
    ˞஋͕૝ఆͱζϨΔ৔߹͕͋Δ
    

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22. GPSNBUύϥϝʔλจࣈྻʮ࣌ʯᶃ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    B
    ޕલɺ·ͨ͸ޕޙ
    ʢখจࣈʣ
    BNɺQN
    "
    ޕલɺ·ͨ͸ޕޙ
    ʢେจࣈʣ
    ".ɺ1.
    # 4XBUDIΠϯλʔωοτ࣌ؒ ʙ
    

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23. GPSNBUύϥϝʔλจࣈྻʮ࣌ʯᶄ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    (
    ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͸͔ͭͳ͍ɻ
    ʙ
    H
    ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͸͔ͭͳ͍ɻ
    ʙ
    )
    ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͕ͭ͘ɻ
    ʙ
    I
    ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͸ͭ͘ɻ
    ʙ
    

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24. GPSNBUύϥϝʔλจࣈྻʮ࣌ʯᶅ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    J ෼ɻθϩ͕ͭ͘ɻ ʙ
    T ඵɻθϩ͕ͭ͘ɻ ʙ
    V ϚΠΫϩඵ
    W
    ϛϦඵ
    ˞1)1Ҏ߱
    
    ˞͢΂ͯখจࣈ
    

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25. GPSNBUύϥϝʔλจࣈྻλΠϜκʔϯࣝผࢠ
    จࣈྻ આ໌ ໭Γ஋ͷྫ
    F λΠϜκʔϯࣝผࢠ "TJB5PLZP
    *ʢ*ͷେจࣈʣ αϚʔλΠϜத͔Ͳ͏͔
    ͳΒαϚʔλΠϜதɻ
    ͳΒͦ͏Ͱ͸ͳ͍ɻ
    0
    (.5ͱͷ࣌ࠩɻ࣌ؒͱ෼ͷ
    ؒʹίϩϯ͕ೖΒͳ͍ɻ
    lz
    1
    (.5ͱͷ࣌ࠩɻ࣌ؒͱ෼ͷ
    ؒʹίϩϯ͕ೖΔɻ
    lz
    5 λΠϜκʔϯུশ +45
    

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26. ϑΥʔϚοτจࣈྻΛ၆ᛌͨ͠ײ૝
    w ࢖͏ػձ͕͋·Γͳͦ͞͏ͳจࣈྻ͕͍͔ͭ͋͘Δɻ
    w ೔ຊࠃ಺ͳΒɺαϚʔλΠϜͷҙࣝ͸ෆཁɻ
    w େจࣈখจࣈͰҙຯ͕େ͖͘มΘΔจࣈ͕΍΍͍͜͠ɻ
    w ʮPʯͱʮ0ʯͱ͔ɻ
    w ༵೔΍݄Λ೔ຊޠදهͰग़ྗͰ͖ͳͯ͘ෆศɻ
    

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27. บ͕͋Δͱײ͡Δͱ͜Ζ
    w ͕͔ͭ͘Ͳ͏͔ͷҧ͍
    w ೔ͷʮEʯʮKʯɺ݄ͷʮNʯʮOʯ
    w िͷ࢝·Γ͕ʮ೔༵೔ʯ͔ʮ݄༵೔ʯͷͭͷύλʔϯ
    w *40ܗࣜͷʮ/ʯͩͱʮ݄༵೔ʯ
    w 64"ํࣜͷʮXʯͩͱʮ೔༵೔ʯ
    w ˞1)1͕ѱ͍Θ͚Ͱ͸ͳ͘ɺ೔෇ͱ࣌ࠁͷදه͕ͦ΋ͦ΋ෳࡶɻ
    

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28. ༨ஊ౾஌ࣝ
    // MEMO: จࣈྻΛϑΥʔϚοτจࣈྻͱͯ͠ѻ͍ͨ͘ͳ͍৔߹ͷখٕ
    // 2020೥12݄12೔ʹ࣮ߦ
    date_default_timezone_set('Asia/Tokyo');
    echo date("\T\o\d\a\y \i\s Y-m-d l \!"); // ʮToday is 2020-12-12 Saturday !ʯ
    จࣈྻΛΤεέʔϓ͢Ε͹ɺϑΥʔϚοτจࣈྻͱͯ͠ݟͳ͞Εͳ͘ͳΓ·͢ɻ
    

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29. %BUF5JNFΫϥε
    %BUF5JNF*NNVUBCMFΫϥεͷ࿩
    

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30. ਖ਼௚ݴ͏ͱɺ
    ͜ͷ2ͭΛ࢖͓ͬͯ͘ͷ͕҆ṛ
    ޙड़͠·͕͢ɺ
    ׬શͰ͸ͳ͍Ͱ͢ɻ
    

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31. TUSUPUJNFؔ਺
    strtotime ( string $datetime [, int $now = time() ] ) : int
    ӳจܗࣜͷ೔෇ΛUnixλΠϜελϯϓʢintܕʣʹม׵͢Δγϯϓϧͳؔ਺ɻ
    Ҿ਺ʹ࢖༻Ͱ͖Δ$datetimeʢ೔෇ͱ࣌ࠁͷॻࣜʣ͸DateTimeɺDateTimeImmutable
    Ͱڞ௨ͷ΋ͷ͕࢖༻Մೳɻ
    var_dump(strtotime('2020-12-10') < strtotime(‘now'));
    // ͜ͷॻ͖ํͰൺֱΛͨ͠ܦݧ͕͋Δਓ͸ଟ͍͸ͣ
    

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32. %BUF5JNFΫϥε
    ೔෇࣌ࠁΛఆٛ͢ΔΫϥεͰ͢ɻ
    ೔෇΍࣌ࠁͷՃݮࢉɺൺֱɺλΠϜκʔϯઃఆɺϑΥʔϚοτग़ྗͳͲ͕ߦ͑Δϝιου͕࣮૷͞Ε͍ͯ·͢ɻ
    $date = new DateTime('now', new DateTimeZone('Asia/Tokyo'));
    $date->add(new DateInterval(‘P2Y3D'));
    $date->modify('+1 day');
    echo $date->format('Y-m-d H:i:s');
    ઌఔઆ໌ͨ͠
    ϑΥʔϚοτจࣈྻ
    

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33. %BUF5JNFΫϥεͷศརͳͱ͜Ζʂ
    w ೔෇΍࣌ࠁͷՃݮࢉɺλΠϜελϯϓͷมߋɻ
    w EBUFؔ਺ͱಉ͡ϑΥʔϚοτܗࣜɻ
    w %BUF5JNFΦϒδΣΫτಉ࢜ΛൺֱՄೳͰɺࠩ෼ݕग़΋Մೳɻ
    

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34. ̍ͭͣͭݟ͍͖ͯ·͠ΐ͏
    

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35. ೔෇΍࣌ؒͷՃݮࢉ
    

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36. ೔෇΍࣌ࠁͷՃݮࢉ $date = new DateTime(‘2020-12-12’);
    // DateTimeΦϒδΣΫτʹ2೥ͱ3೥ΛՃ͑Δɻ
    $date->add(new DateInterval(‘P2Y3D'));
    // DateTimeΦϒδΣΫτ͔Β1೥ɺ1ϲ݄ɺ1೔ΛҾ͘ɻ
    $date->sub(new DateInterval('P1Y1M1D'));
    echo $date->format(‘Y-m-d'); // 2021-11-14
    w %BUF5JNFBEE
    w %BUF5JNFTVC
    ػೳࣗମ͸ඇৗʹγϯϓϧ
    

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37. %BUF*OUFSWBMΫϥεͱ͸ʁ
    

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38. %BUF*OUFSWBMΫϥεͱ͸
    ೔෇ͷִؒΛදݱ͢ΔΫϥεͰ͢ɻ࢖͑Δํࣜ͸೥ɺ݄ɺ೔ɺ࣌ؒɺ෼ɺඵɺϚΠΫϩඵͳͲɻ
    P(Periodͷུ) Y(೥) M(݄) D(೔) Hʢ࣌ʣIʢ෼ʣSʢඵʣFʢϚΠΫϩඵʣ
    ʮେ͖͍୯Ґ͸ࠨʹએݴʯʮ਺஋͸୯Ґͷલʹॻ͘ʯͱ͍͏2ͭͷϧʔϧ͕͋Γ·͢ɻ
    $date = new DateTime('2020-12-12 15:00:00', new DateTimeZone('Asia/Tokyo'));
    $date->add(new DateInterval('P1Y2M3D')); // 1೥ɺ2ϲ݄ɺ3೔ΛՃࢉ
    $date->add(new DateInterval('PT6H4M10S')); // 6࣌ؒɺ4෼ɺ10ඵΛՃࢉ
    echo $date->format('Y-m-d H:i:s.u'); // 2022-02-15 21:04:10.000000
    

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39. λΠϜελϯϓͷมߋ
    $date = new DateTime(
    '2020-12-12',
    new DateTimeZone('Asia/Tokyo')
    );
    // $modifierʢ೔෇/࣌ࠁ จࣈྻʣΛҾ਺ʹΘͨ͢
    $date->modify('last day of next month');
    echo $date->format(‘Y-m-d'); // 2021-01-31
    w %BUF5JNFNPEJGZ
    BEEɺTVCΑΓ΋
    ࣗ༝౓͕ߴ͍
    

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40. ೔෇ͱ࣌ࠁͷॻࣜʹ͍ͭͯ
    w ࣌ࠁͷॻࣜ
    w ೔෇ͷॻࣜ
    w ෳ߹తͳॻࣜ
    w ૬ରతͳॻࣜ
    

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41. ೔෇ͱ࣌ࠁͷॻࣜ࣌ࠁ
    $date = new DateTime(‘T151130'); // ೔෇Λলུ͢Δͱɺࠓͷ೔෇ʹͳΔ
    echo $date->format('Y-m-d H:i:s’); // 2020-12-12 15:11:30
    $date = new DateTime(‘7:19:19 PM’); // ώϡʔϚϯϦʔμϒϧ
    echo $date->format('Y-m-d H:i:s’); // 2020-12-12 19:19:19
    $date = new DateTime(‘2010'); // ※ ඇਪ঑
    echo $date->format('Y-m-d H:i:s’); // 2020-12-12 00:00:00
    

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42. ೔෇ͱ࣌ࠁͷॻࣜ೔෇
    $date = new DateTime('2020-12-12');
    echo $date->format('Y-m-d H:i:s’); // 2020-12-12 00:00:00
    $date = new DateTime('December 12th, 2020’); // ӳޠݍͷදه
    echo $date->format('Y-m-d H:i:s’);
    $date = new DateTime(’12/12/20'); // ΞϝϦΧࣜͷ೥݄೔ʢޙड़͠·͕͢ɺ᠘͕͋Γ·͢ʣ
    echo $date->format('Y-m-d H:i:s’);
    

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43. ೔෇ͱ࣌ࠁͷॻࣜෳ߹తͳॻࣜ
    $date = new DateTime('2020-12-12 15:00:00’); // MySQLͷDateॻࣜ
    echo $date->format('Y-m-d H:i:s’);
    $date = new DateTime(‘2020-W51'); // ISO ͷ೥ɺि൪߸
    echo $date->format('Y-m-d H:i:s’); // 2020-12-14 00:00:00
    $date = new DateTime('12/Dec/2020:15:00:00 +0900’); // Apacheϩάʹ͓͚Δ࣌ࠁॻࣜ
    echo $date->format('Y-m-d H:i:s’); // 2020-12-12 15:00:00
    

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44. ೔෇ͱ࣌ࠁͷॻࣜ૬ରతͳॻࣜᶃ
    /* modifyؔ਺ʹ࢖͏ͷ͸ɺجຊతʹ͜ͷॻࣜͰ͢ */
    $date = new DateTime('last day’); // ʮ࠷ޙͷ೔ʯͰ͸ͳ͘ʮࡢ೔ʯ
    echo $date->format(‘Y-m-d’); // 2020-12-11
    $date = new DateTime('last day of Feb 2020’); // ʮࡢ೔ʯͰ͸ͳ͘ʮ݄ͷ࠷ऴ೔ʯ
    echo $date->format(‘Y-m-d'); // 2020—02-29
    $date = new DateTime('2020-12-12');
    $date->modify('-1 week’);
    echo $date->format(‘Y-m-d’); // 2020-12-05
    

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45. ೔෇ͱ࣌ࠁͷॻࣜ૬ରతͳॻࣜᶄ
    $date = new DateTime('2020-12-12');
    $date->modify(‘Monday'); // dayname ʮ࣍ʹ΍ͬͯ͘Δࢦఆ͞Ε༵ͨ೔ʯ※᠘͕͋Γ·͢
    echo $date->format('Y-m-d l’); // 2020-12-14 Monday
    $date = new DateTime(‘2020-12-12’); // ౔༵೔
    echo $date->format(‘Monday this week’); // weekday + last/this/next week
    echo $date->format('Y-m-d l'); // 2020-12-07 Monday
    $date = new DateTime('2020-12-12');
    $date->modify('Monday +7 weeks’); // ॻࣜΛ૊Έ߹ΘͤΔ͜ͱ΋Մೳ
    echo $date->format('Y-m-d l’); // 2021-02-01 Monday
    

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46. ศརͳͷ͸ؒҧ͍ͳ͍Ͱ͢ɻ
    Ͱ͕͢ɺ᠘΋͋Γ·͢ɻ
    

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47. ૝ఆ֎ͷղऍ
    $date = new DateTime(‘2500');
    echo $date->format('Y-m-d H:i:s’); // ??
    $date = new DateTime('2020-01-31');
    $date->modify('+1 month’);
    echo $date->format(‘Y-m-d'); // ??
    $date = new DateTime('00/07/20');
    echo $date->format('Y-m-d’); // ??
    

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48. ૝ఆ֎ͷղऍछ໌͔͠
    $date = new DateTime(‘2500’); // 2459Λ௒͑Δͱɺʮ೥ʯͩͱݟͳ͞ΕΔɻ
    echo $date->format('Y-m-d H:i:s’); // 2500-12-12 15:00:00
    $date = new DateTime(‘2020-01-31');
    $date->modify('+1 month');
    echo $date->format(‘Y-m-d'); // 2020–02-31͕ΦʔόʔϑϩʔΛىͯ͜͠ɺ2020-03-02ʹͳΔɻ
    // ΞϝϦΧࣜͷ೔෇ղऍͱݟͳ͞ΕΔ
    $date = new DateTime(’00/07/20'); // 2020-00-07
    echo $date->format('Y-m-d’); // 2019-12-07
    ɾZZNNEE
    ɾNNEEZ
    

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49. ༨ஊαϚʔλΠϜͷ᠘
    // MEMO: ΞϝϦΧͷ2020೥ͷαϚʔλΠϜͷऴΘΓ͸ɺ11݄1೔ͷਂ໷2࣌
    // ޕલ2͔࣌Βޕલ1࣌ʹɺ1͚࣌ؒͩ໭Γ·͢
    $dt = new DateTimeImmutable(
    '2020-11-01 01:00:00',
    new DateTimeZone('America/New_York')
    );
    echo $dt->add(new DateInterval('PT10H'))->format('Y-m-d H:i:s’);
    // 2020-11-01 10:00:00
    echo $dt->modify('+10 hours')->format('Y-m-d H:i:s’);
    // 2020-11-01 11:00:00
    

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50. ެࣜυΩϡϝϯτʹࡌ͍ͬͯΔ࿩
    ͹͔ΓͳͷͰɺ͝Ұಡ͋Εʂ
    

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51. %BUF5JNFΦϒδΣΫτͷൺֱ
    

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52. ͜Ε·Ͱͷ೔෇ൺֱ
    // dateಉ࢜Λൺֱͨ͠Γɺstrtotimeؔ਺ͷ݁Ռಉ࢜Λൺֱͨ͠Γ
    $targetDate = date('2020-12-12');
    var_dump(strtotime($targetDate) < strtotime(‘now’));
    // MEMO: strtotime͸UnixλΠϜελϯϓΛฦ͢ͷͰɺλΠϜκʔϯ͸UTCݻఆʹͳͬͯ͠·͏ɻ
    // MEMO: date͸ฦΓ஋͕StringͳͷͰɺฦΓ஋ͷՃ޻͕ෆศɻ
    

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53. ͜Ε͔Βͷ೔෇ൺֱᶃ
    $dt = new DateTime('2020-12-25');
    var_dump($dt < new DateTime(‘2020-12-12‘)); // bool(false)
    $dt = new DateTime(‘2020-12-10');
    var_dump($dt < new DateTime(‘2020-12-12’)); // bool(true)
    %BUF5JNFΦϒδΣΫτಉ࢜
    ΛൺֱՄೳʂʂ
    

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54. ͜Ε͔Βͷ೔෇ൺֱᶄ
    // Question: ΠίʔϧͰൺֱͯ͠΋ͪΌΜͱಈ͘ʁ
    $dt = new DateTime('2020-12-12 15:00:00');
    var_dump($dt == new DateTime('2020-12-12 15:00:00’)); // ??
    var_dump($dt === new DateTime('2020-12-12 15:00:00’)); // ??
    USVFʁGBMTFʁ
    

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55. ͜Ε͔Βͷ೔෇ൺֱᶄ
    $dt = new DateTime('2020-12-12 15:00:00');
    var_dump($dt == new DateTime('2020-12-12 15:00:00’)); // true
    var_dump($dt === new DateTime('2020-12-12 15:00:00’)); // false
    // MEMO: === ͸ಉ͡Ϋϥεͷಉ͡ΠϯελϯεΛൺֱͨ͠৔߹Ͱͳ͍ͱɺtrueʹ͸ͳΒͳ͍ɻ
    // https://www.php.net/manual/ja/language.oop5.object-comparison.php
    

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56. ͜Ε͔Βͷ೔෇ൺֱᶅ
    $dt = new DateTime('2020-12-12');
    $diff = $dt->diff(new DateTime('last day of Dec 2020'));
    echo $diff->format(‘%a’); // 19
    echo $diff->format('%R%a days'); // +19 days
    // a: diffؔ਺ͷ݁Ռʹ࢖༻ͨ͠৔߹ɺ૯೔਺
    // R: ϓϥε͔ϚΠφε
    // https://www.php.net/manual/ja/dateinterval.format.php
    ࠩ෼΋ݕग़Մೳʂʂ
    

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57. %BUF5JNF*NNVUBCMFΫϥε
    

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58. Πϛϡʔλϒϧͳ%BUF5JNFΫϥε
    $dt = new DateTimeImmutable('2020-12-12');
    echo $dt->modify('+1 week’)->format(‘Y-m-d’); // ??
    echo $dt->modify('+1 day’)->format(‘Y-m-d'); // ??
    $dt = new DateTime('2020-12-12');
    echo $dt->modify('+1 week’)->format('Y-m-d'); // ??
    echo $dt->modify('+1 day’)->format('Y-m-d'); // ??
    

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59. Πϛϡʔλϒϧͳ%BUF5JNFΫϥε
    $dt = new DateTimeImmutable('2020-12-12');
    echo $dt->modify('+1 week’)->format(‘Y-m-d’); // 2020-12-19
    echo $dt->modify('+1 day’)->format(‘Y-m-d'); // 2020-12-13
    $dt = new DateTime('2020-12-12');
    echo $dt->modify('+1 week’)->format('Y-m-d'); // 2020-12-19
    echo $dt->modify('+1 day’)->format('Y-m-d'); // 2020-12-20
    Πϯελϯεͷঢ়ଶ͕ෆม
    

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60. த਎ͷՃ޻͕ෆཁͳΒ
    %BUF5JNF*NNVUBCMFΫϥε
    

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61. ೔෇΍࣌ࠁͷϥΠϒϥϦ
    

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62. %BUF5JNFΫϥεͰ
    ࿫͑ͳ͍͜ͱ΋࣮͸͋Γ·͢ɻ
    

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63. %BUF5JNFΫϥεͰͰ͖ͳ͍͜ͱ
    w ೔ຊޠ΁ͷϩʔΧϥΠζ
    w ςετίʔυ࣮૷࣌ͷϞοΫΞοϓ
    

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64. ͦΕΒΛղܾ͢ΔϥΠϒϥϦ܊
    w $BSCPO
    w IUUQTHJUIVCDPNCSJBOOFTCJUU$BSCPO
    w $BLF1)1$ISPOPT
    w IUUQTHJUIVCDPNDBLFQIQDISPOPT
    w ˞$BLF1)1ʹݶఆ͞Εͨ࿩ଟΊͳͷͰɺࠓճ͸$BSCPOͷ࿩ΛϝΠ
    ϯʹ͠·͢
    

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65. ೔ຊޠ΁ͷϩʔΧϥΠζʲૉͷ1)1ฤʳ
    // ೔ຊޠද͍͚ࣔͨ͠ͲͰ͖ͳ͍
    $dt = new DateTime('2020-12-12', new DateTimeZone('Asia/Tokyo'));
    echo $dt->format('Y-m-d F l’); // 2020-12-12 December Saturday
    $dt->format(’N w’); // 6 6
    // MEMO: N͸1ʢ݄༵೔ʣʙ7ʢ೔༵೔ʣɺw͸1ʢ೔༵೔ʣʙ6ʢ౔༵೔ʣ
    // ͜ΕΒΛ༵೔ʹม׵͢Δؔ਺Λࣗ࡞͢Δํ๏΋ΞϦ
    

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66. ೔ຊޠ΁ͷϩʔΧϥΠζʲ$BSCPOฤʳ
    // MEMO: Carbon v2.42.0ͷ࣮ߦ݁Ռ
    $carbon = new Carbon('2020-12-12');
    $date = $carbon->locale('ja');
    echo $date->locale(); // ja
    echo $date->monthName; // 12݄
    echo $date->dayName; // ౔༵೔
    ೔ຊޠͰදࣔͰ͖Δʂʂ
    

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67. %BUF5JNFͱͷޓ׵ੑ͸͋Δͷʁ
    w ͋Γ·͢ɻ%BUF5JNFΫϥεͱ%BUF5JNF*NNVUBCMFΫϥεͷৼΔ෣
    ͍͸ͦͷ··࢖͑·͢ɻ
    w $BSCPO͸%BUF5JNFΫϥεͷ֦ுɻ
    w $BLF1)1$ISPOPT͸%BUF5JNF*NNVUBCMFΫϥεͷ֦ுɻ
    w ࡶͳදݱΛ͢ΔͱɺͭͷϥΠϒϥϦ͸%BUF5JNFͷ্Ґޓ׵Ͱ͢ɻ
    

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68. ༨ஊ$BLF1)1͕$BSCPOΛ࢖ͬͯͳ͍ཧ༝͸ʁ
    w $BLF1)1͸·Ͱ$BSCPOΛ࢖͍ͬͯͨɻ
    w ͔͠͠ɺ$BSCPO͸όʔδϣϯܥͷࠒ͸ϛϡʔλϒϧͳΦϒδΣΫτ
    ͔͠࡞Εͳ͔ͬͨɻ
    w $ISPOPT͕%BUF5JNF*NNVUBCMFΫϥεͷ֦ு࿏ઢͰ։ൃ͞Εͨͷ͸
    ͦͷӨڹɻ
    w $BSCPOܥͰ͸ΠϛϡʔλϒϧͳΦϒδΣΫτΛѻ͑ΔΑ͏ʹͳͬ
    ͍ͯΔɻ
    

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69. ͯ͞ɺ͕࣍࠷ޙͷτϐοΫͰ͢
    

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70. ೔͕࣌བྷΉςετίʔυ
    

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71. ೔͕࣌བྷΉςετίʔυ͸೉͍͠
    w ྫ࣌Λա͗Δલ͸ʮ͜Μʹͪ͸ʯɻ࣌Λա͗ͨޙ͸ʮ͜Μ͹
    Μ͸ʯΛฦؔ͢਺͕͋Δͱ͠·͢ɻ
    w ͜ͷؔ਺ͷςετίʔυΛ࣌ʹಈ͔͢ͱʮ͜Μʹͪ͸ʯ͕ظ଴஋
    ʹͳΓ·͕͢ɺ࣌ʹಈ͔͢ͱʮ͜Μ͹Μ͸ʯ͕ظ଴஋ʹͳΓ·͢ɻ
    w ࢀߟIUUQTUXBEBIBUFOBCMPHKQFOUSZEFTJHOGPSUFTUBCJMJUZ
    

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72. ςετίʔυ͸
    RepeatableͰͳ͚Ε͹ͳΒͳ͍
    

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73. ςετίʔυͷϞοΫΞοϓΛ͢Δ
    // ςετίʔυ࣮ߦલʹ೔࣌Λݻఆ͠ɺظ଴஋Λ੍ޚ͢Δɻ
    Carbon::setTestNow(new Carbon('2020-12-12 17:00:00’));
    $result = greet();
    $this->assertEquals($result, ‘͜Μʹͪ͸'); // True
    Carbon::setTestNow(new Carbon('2020-12-12 19:00:00'));
    $result = greet();
    $this->assertEquals($result, ‘͜Μ͹Μ͸'); // False
    $ISPOPTͰ΋ಉ༷ͷػೳ͕
    ఏڙ͞Ε͍ͯΔͷͰ҆৺ʂ
    

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74. %BUF5JNFΫϥε
    ͍͚֮͑ͯͨͩ·͔ͨ͠ʁ
    

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75. ·ͱΊ
    

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76. ·ͱΊ
    w ೔࣌Λѻ͏࣌͸%BUF5JNF*NNVUBCMFΫϥεΛ࢖͏΂͠ɻ
    w ެࣜυΩϡϝϯτͰʮϑΥʔϚοτจࣈྻʯ΍ʮ೔෇΍࣌ࠁͷॻࣜʯ
    ͷบΛ஌͓ͬͯ͘΂͠ɻ
    w αϚʔλΠϜͷ࿩΋ॻ͍ͯ͋Γ·͢ɻ
    w %BUF5JNFΫϥεͷ஌ࣝ͸ϥΠϒϥϦͰ΋ͦͷ··׆͔ͤΔɻ
    w ੵۃతʹϥΠϒϥϦΛཔΔ΂͠ɻ
    

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77. ࢿྉ΍ൃදʹର͢ΔϑΟʔυόοΫΛ
    ͓଴͓ͪͯ͠Γ·͢ɻ
    

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78. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ
    

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