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
   +BQBO
   
   3FCPSOʯ
   IUUQTQIQDPOQIQHSKQ
2. ࣗݾ঺հ w ࢁాɹ঵ʢ΍·ͩɹ͠ΐ͏ʣ
   w ίωώτגࣜձࣾͰαʔόʔαΠυΤϯδχ ΞΛ΍͓ͬͯΓ·͢ɻ
   w Ұ൪ಘҙͳͷ͸ɺ1)1Ͱ͸ͳ͘$44Ͱ͢ɻ
3. ૣ଎Ͱ͕͢
4. 1)1ͷ೔෇ܭࢉͬͯ
   Ͳ͏͢Δͷ͕ϕετͳΜͩΖ͏ɾɾʁ
5. ʮQIQ
   ೔෇ʯʮQIQ
   ೔෇
   ܭࢉʯ
   Ͱݕࡧͨ͠ܦݧ͸͋Γ·ͤΜ͔ʁ
6. TUSUPUJNFʁ
   EBUF
   EBUFUJNFʁ
7. ࠓ೔ͷൃදͰɺ࣮૷ͷ໎͍Λ
   গ͠Ͱ΋ݮΒͤΕ͹خ͍͠Ͱ͢ɻ
8. 
   ຊ೔࿩͢͜ͱ w EBUFؔ਺ͱϑΥʔϚοτॻࣜʹ͍ͭͯ
   w %BUF5JNFΫϥεɺ%BUF5JNF*NNVUBCMFΫϥεʹ͍ͭͯ
   w ೔෇΍࣌ࠁͷϥΠϒϥϦʹ͍ͭͯ
9. ͦΕͰ͸ɺຊฤελʔτͰ͢ɻ
10. EBUFؔ਺ͱ
    ϑΥʔϚοτॻࣜ
11. ·ͣ͸EBUFؔ਺ʹ͍ͭͯ஌Γ·͠ΐ͏
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
13. ͱ͜ΖͰϑΥʔϚοτจࣈྻͬͯʁ
14. GPSNBUύϥϝʔλจࣈྻͱ͸ʁ w ͦͷ໊ͷ௨Γɺ೔෇ͷϑΥʔϚοτʹ༻͍Δɻ
    w ޙड़͢Δ%BUF5JNFɺ%BUF5JNF*NNVUBCMFΫϥεͰ΋࢖༻Մೳɻ
    w ೔ɺिɺ݄ɺ೥ɺ࣌ɺλΠϜκʔϯͳͲ༷ʑͳछྨ͕͋Δɻ
    
    
    ˠ
    ࣍ϖʔδҎ߱Ͱઆ໌͍͖ͯ͠·͢ɻ
    ࢀߟ
    
    IUUQTXXXQIQOFUNBOVBMKBEBUFUJNFGPSNBUQIQ
15. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ೔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
16. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ೔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
17. GPSNBUύϥϝʔλจࣈྻ
    
    ʮिʯ LP จࣈྻ આ໌ ໭Γ஋ͷྫ 8ʢେจࣈʣ *40ܗࣜͰ
    ݄༵೔࢝·Γͷि൪߸ ʢ೥ͷୈि໨ʣ ※ ISO-8601ܗࣜͷ࢓༷ʹบ͕͋Γ·͢ɻ࣍ͷεϥΠυͰղઆ͠·͢ɻ
18. िͱ༵೔ͷܾΊ͝ͱʢ*40ʣ w ͢΂ͯͷि͸࢝·Γ͸ʮ݄༵೔ʯ
    w ͋Δ೥ͷ࠷ॳͷि͸ͦͷ೥ͷ࠷ॳͷ໦༵೔ΛؚΉिɻ
    w ྫ
    ͸ʮՐ༵೔ʯɻि൪߸͸͍ͭ͘ʁ
    w ೥݄೔͸ʮ౔༵೔ʯ
19. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ݄ʯᶃ จࣈྻ આ໌ ໭Γ஋ͷྫ ' ϑϧεϖϧͷ݄ɻ +BOVBSZ
    ʙ
    %FDFNCFS . จࣈܗࣜͷ݄ɻ +BO
    ʙ
    %FD
20. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ݄ʯᶄ จࣈྻ આ໌ ໭Γ஋ͷྫ N ਺ࣈͰ݄Λදݱɻ
    ઌ಄ʹθϩ͕ͭ͘ɻ 
    ʙ
     O ਺ࣈͰ݄Λදݱɻ
    ઌ಄ʹθϩ͕͔ͭͳ͍ɻ 
    ʙ
     U ࢦఆ݄ͨ͠ͷ݄਺ ɺɺɺ
21. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ೥ʯ จࣈྻ આ໌ ໭Γ஋ͷྫ : ܻͷ਺ࣈͷ೥ ɺ Z ܻͷ਺ࣈͷ೥ ɺ - Ӟ೥Ͱ͋Δ͔Ͳ͏͔ ͳΒӞ೥
    ͳΒӞ೥Ͱ͸ͳ͍ Pʢ0ͷখจࣈʣ *40ܗࣜͷि൪߸
    ͔Βܾఆ͞Εͨ೥ ɺ
    ˞஋͕૝ఆͱζϨΔ৔߹͕͋Δ
22. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ࣌ʯᶃ จࣈྻ આ໌ ໭Γ஋ͷྫ B ޕલɺ·ͨ͸ޕޙ
    ʢখจࣈʣ BNɺQN " ޕલɺ·ͨ͸ޕޙ
    ʢେจࣈʣ ".ɺ1. # 4XBUDIΠϯλʔωοτ࣌ؒ 
    ʙ
    
23. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ࣌ʯᶄ จࣈྻ આ໌ ໭Γ஋ͷྫ ( ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͸͔ͭͳ͍ɻ 
    ʙ
     H ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͸͔ͭͳ͍ɻ 
    ʙ
     ) ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͕ͭ͘ɻ 
    ʙ
     I ࣌ؒ୯Ґͷ࣌ɻ
    θϩ͸ͭ͘ɻ 
    ʙ
    
24. GPSNBUύϥϝʔλจࣈྻ
    
    ʮ࣌ʯᶅ จࣈྻ આ໌ ໭Γ஋ͷྫ J ෼ɻθϩ͕ͭ͘ɻ 
    ʙ
     T ඵɻθϩ͕ͭ͘ɻ 
    ʙ
     V ϚΠΫϩඵ  W ϛϦඵ
    ˞1)1Ҏ߱  ˞͢΂ͯখจࣈ
25. GPSNBUύϥϝʔλจࣈྻ
    
    λΠϜκʔϯࣝผࢠ จࣈྻ આ໌ ໭Γ஋ͷྫ F λΠϜκʔϯࣝผࢠ "TJB5PLZP *ʢ*ͷେจࣈʣ αϚʔλΠϜத͔Ͳ͏͔ ͳΒαϚʔλΠϜதɻ
    ͳΒͦ͏Ͱ͸ͳ͍ɻ 0 (.5ͱͷ࣌ࠩɻ࣌ؒͱ෼ͷ ؒʹίϩϯ͕ೖΒͳ͍ɻ l z 1 (.5ͱͷ࣌ࠩɻ࣌ؒͱ෼ͷ ؒʹίϩϯ͕ೖΔɻ l z 5 λΠϜκʔϯུশ +45
26. ϑΥʔϚοτจࣈྻΛ၆ᛌͨ͠ײ૝ w ࢖͏ػձ͕͋·Γͳͦ͞͏ͳจࣈྻ͕͍͔ͭ͋͘Δɻ
    w ೔ຊࠃ಺ͳΒɺαϚʔλΠϜͷҙࣝ͸ෆཁɻ
    w େจࣈখจࣈͰҙຯ͕େ͖͘มΘΔจࣈ͕΍΍͍͜͠ɻ
    w ʮPʯͱʮ0ʯͱ͔ɻ
    w ༵೔΍݄Λ೔ຊޠදهͰग़ྗͰ͖ͳͯ͘ෆศɻ
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
28. ༨ஊ
    
    ౾஌ࣝ // 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
29. %BUF5JNFΫϥε
    %BUF5JNF*NNVUBCMFΫϥεͷ࿩
30. ਖ਼௚ݴ͏ͱɺ ͜ͷ2ͭΛ࢖͓ͬͯ͘ͷ͕҆ṛ ޙड़͠·͕͢ɺ
    ׬શͰ͸ͳ͍Ͱ͢ɻ
31. TUSUPUJNFؔ਺ strtotime ( string $datetime [, int $now = time() ] ) : int ӳจܗࣜͷ೔෇ΛUnixλΠϜελϯϓʢintܕʣʹม׵͢Δγϯϓϧͳؔ਺ɻ Ҿ਺ʹ࢖༻Ͱ͖Δ$datetimeʢ೔෇ͱ࣌ࠁͷॻࣜʣ͸DateTimeɺDateTimeImmutable Ͱڞ௨ͷ΋ͷ͕࢖༻Մೳɻ <?php var_dump(strtotime('2020-12-10') < strtotime(‘now')); // ͜ͷॻ͖ํͰൺֱΛͨ͠ܦݧ͕͋Δਓ͸ଟ͍͸ͣ
32. %BUF5JNFΫϥε ೔෇࣌ࠁΛఆٛ͢ΔΫϥεͰ͢ɻ ೔෇΍࣌ࠁͷՃݮࢉɺൺֱɺλΠϜκʔϯઃఆɺϑΥʔϚοτग़ྗͳͲ͕ߦ͑Δϝιου͕࣮૷͞Ε͍ͯ·͢ɻ <?php $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
33. %BUF5JNFΫϥεͷศརͳͱ͜Ζʂ w ೔෇΍࣌ࠁͷՃݮࢉɺλΠϜελϯϓͷมߋɻ
    w EBUFؔ਺ͱಉ͡ϑΥʔϚοτܗࣜɻ
    w %BUF5JNFΦϒδΣΫτಉ࢜ΛൺֱՄೳͰɺࠩ෼ݕग़΋Մೳɻ
34. ̍ͭͣͭݟ͍͖ͯ·͠ΐ͏
35. ೔෇΍࣌ؒͷՃݮࢉ
36. ೔෇΍࣌ࠁͷՃݮࢉ <?php $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
37. %BUF*OUFSWBMΫϥεͱ͸ʁ
38. %BUF*OUFSWBMΫϥεͱ͸ ೔෇ͷִؒΛදݱ͢ΔΫϥεͰ͢ɻ࢖͑Δํࣜ͸೥ɺ݄ɺ೔ɺ࣌ؒɺ෼ɺඵɺϚΠΫϩඵͳͲɻ P(Periodͷུ) Y(೥) M(݄) D(೔) Hʢ࣌ʣIʢ෼ʣSʢඵʣFʢϚΠΫϩඵʣ ʮେ͖͍୯Ґ͸ࠨʹએݴʯʮ਺஋͸୯Ґͷલʹॻ͘ʯͱ͍͏2ͭͷϧʔϧ͕͋Γ·͢ɻ <?php $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
39. λΠϜελϯϓͷมߋ <?php $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
40. ೔෇ͱ࣌ࠁͷॻࣜʹ͍ͭͯ w ࣌ࠁͷॻࣜ
    w ೔෇ͷॻࣜ
    w ෳ߹తͳॻࣜ
    w ૬ରతͳॻࣜ
41. ೔෇ͱ࣌ࠁͷॻࣜ
    
    ࣌ࠁ $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
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’);
43. ೔෇ͱ࣌ࠁͷॻࣜ
    
    ෳ߹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
44. ೔෇ͱ࣌ࠁͷॻࣜ
    
    ૬ରతͳॻࣜᶃ /* 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
45. ೔෇ͱ࣌ࠁͷॻࣜ
    
    ૬ରతͳॻࣜᶄ $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
46. ศརͳͷ͸ؒҧ͍ͳ͍Ͱ͢ɻ
    Ͱ͕͢ɺ᠘΋͋Γ·͢ɻ
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’); // ??
48. ૝ఆ֎ͷղऍ
    
    छ໌͔͠ $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
49. ༨ஊ
    
    αϚʔλΠϜͷ᠘ // 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
50. ެࣜυΩϡϝϯτʹࡌ͍ͬͯΔ࿩
    ͹͔ΓͳͷͰɺ͝Ұಡ͋Εʂ
51. %BUF5JNFΦϒδΣΫτͷൺֱ
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
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
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
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
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
57. %BUF5JNF*NNVUBCMFΫϥε
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'); // ??
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
60. த਎ͷՃ޻͕ෆཁͳΒ
    %BUF5JNF*NNVUBCMFΫϥε
61. ೔෇΍࣌ࠁͷϥΠϒϥϦ
62. %BUF5JNFΫϥεͰ
    ࿫͑ͳ͍͜ͱ΋࣮͸͋Γ·͢ɻ
63. %BUF5JNFΫϥεͰͰ͖ͳ͍͜ͱ w ೔ຊޠ΁ͷϩʔΧϥΠζ
    w ςετίʔυ࣮૷࣌ͷϞοΫΞοϓ
64. ͦΕΒΛղܾ͢ΔϥΠϒϥϦ܊ w $BSCPO
    w IUUQTHJUIVCDPNCSJBOOFTCJUU$BSCPO
    w $BLF1)1
    $ISPOPT
    w IUUQTHJUIVCDPNDBLFQIQDISPOPT
    w ˞$BLF1)1ʹݶఆ͞Εͨ࿩ଟΊͳͷͰɺࠓճ͸$BSCPOͷ࿩ΛϝΠ ϯʹ͠·͢
65. ೔ຊޠ΁ͷϩʔΧϥΠζ
    ʲૉͷ1)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 $dt->format(’N w’); // 6 6 // MEMO: N͸1ʢ݄༵೔ʣʙ7ʢ೔༵೔ʣɺw͸1ʢ೔༵೔ʣʙ6ʢ౔༵೔ʣ // ͜ΕΒΛ༵೔ʹม׵͢Δؔ਺Λࣗ࡞͢Δํ๏΋ΞϦ
66. ೔ຊޠ΁ͷϩʔΧϥΠζ
    ʲ$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
67. %BUF5JNFͱͷޓ׵ੑ͸͋Δͷʁ w ͋Γ·͢ɻ%BUF5JNFΫϥεͱ%BUF5JNF*NNVUBCMFΫϥεͷৼΔ෣ ͍͸ͦͷ··࢖͑·͢ɻ
    w $BSCPO͸%BUF5JNFΫϥεͷ֦ுɻ
    w $BLF1)1
    $ISPOPT͸%BUF5JNF*NNVUBCMFΫϥεͷ֦ுɻ
    w ࡶͳදݱΛ͢ΔͱɺͭͷϥΠϒϥϦ͸%BUF5JNFͷ্Ґޓ׵Ͱ͢ɻ
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 $BSCPO
    ܥͰ͸ΠϛϡʔλϒϧͳΦϒδΣΫτΛѻ͑ΔΑ͏ʹͳͬ ͍ͯΔɻ
69. ͯ͞ɺ͕࣍࠷ޙͷτϐοΫͰ͢
70. ೔͕࣌བྷΉςετίʔυ
71. ೔͕࣌བྷΉςετίʔυ͸೉͍͠ w ྫ
    
    ࣌Λա͗Δલ͸ʮ͜Μʹͪ͸ʯɻ࣌Λա͗ͨޙ͸ʮ͜Μ͹ Μ͸ʯΛฦؔ͢਺͕͋Δͱ͠·͢ɻ
    w ͜ͷؔ਺ͷςετίʔυΛ࣌ʹಈ͔͢ͱʮ͜Μʹͪ͸ʯ͕ظ଴஋ ʹͳΓ·͕͢ɺ࣌ʹಈ͔͢ͱʮ͜Μ͹Μ͸ʯ͕ظ଴஋ʹͳΓ·͢ɻ
    w ࢀߟ
    
    IUUQTUXBEBIBUFOBCMPHKQFOUSZEFTJHOGPSUFTUBCJMJUZ
72. ςετίʔυ͸ RepeatableͰͳ͚Ε͹ͳΒͳ͍
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
74. %BUF5JNFΫϥε
    ͍͚֮͑ͯͨͩ·͔ͨ͠ʁ
75. ·ͱΊ
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
77. ࢿྉ΍ൃදʹର͢ΔϑΟʔυόοΫΛ ͓଴͓ͪͯ͠Γ·͢ɻ
78. ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ