Stop using var_dump(); Embrace step debugging

EE CONF 2017 Presentation

Transcript

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2. Stop using var_dump(); embrace step debugging 2
3. Step debugging is stopping code execution on a specific line of code, then advancing the application 1 line of code at a time. 3
4. {exp:channel:entries channel="foo" var_dump="yes" } {entry_id} {/exp:channel:entries} 4
5. {exp:channel:entries channel="foo"} ={title}={entry_id}={some_custom_field}= {/exp:channel:entries} 5
6. {exp:channel:entries channel="foo"} <pre>{entry_id}</pre> {/exp:channel:entries} 6
7. var_dump(); 7
8. var_dump($entry); die; object(BoldMinded\Publisher\Service\Entry\Entry) private 'request' => object(BoldMinded\Publisher\Service\Request) private 'siteId' => int 1 private 'entryId' => null private 'defaultLanguage' => object(BoldMinded\Publisher\Model\Language) protected 'id' => int 1 protected 'short_name' => string 'en' (length=2) protected 'short_name_segment' => string 'en' (length=2) protected 'long_name' => string 'English' (length=7) protected 'locale' => string 'en_EN' (length=5) protected 'language_pack' => string 'english' (length=7) protected 'cat_url_indicator' => string 'category' (length=8) protected 'is_default' => string 'y' (length=1) protected 'is_enabled' => string 'y' (length=1) protected 'direction' => string 'ltr' (length=3) protected 'sites' => string '[1]' (length=3) protected '_name' => string 'publisher:Language' (length=18) 8
9. Pros — Easy — No special tools necessary — Works anywhere 9
10. Cons — Slow — Lacks context 10
11. Alternative function writeToFile($fileName, $data) { $file = PATH_CACHE.$fileName.'.txt'; $stream = fopen($file, 'a+'); fwrite($stream, print_r($data, TRUE) ."\n"); fclose($stream); } 11
12. Xdebug is a PHP extension which provides debugging and profiling capabilities. 12
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15. Installing and Configuring apt-get install php-xdebug vim /etc/php/apache2/php.ini zend_extension=xdebug.so xdebug.remote_connect_back=1 xdebug.remote_autostart=0 xdebug.remote_enable=1 xdebug.show_exception_trace=1 15
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17. Tools — PhpStorm — SublimeText w/ plugin ¯\_(ϑ)_/¯ — Microsoft Code w/ plugin 17
18. Navigating — Setting breakpoints 18
19. Navigating — Conditional breakpoints 19
20. Navigating — Stepping over 20
21. Navigating — Stepping into 21
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26. Tools — https://www.jetbrains.com/phpstorm/marklets/ — Xdebug Helper in Chrome Store — ?XDEBUG_SESSION_START=PHPSTORM 26
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29. Demo <blink>Click Here!</blink> 29
30. Useful breakpoint locations in EE — system/ee/legacy/libraries/Core.php function generate_page() — system/ee/EllisLab/Addons/channel/mod.channel.php function entries() — system/ee/legacy/libraries/Template.php function run_template_engine() 30
31. Personal favorites — Call stack while debugging — Easier to debug loops — Can see EE template code at different parse states 31
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33. Remote step debugging zend_extension=xdebug.so xdebug.remote_connect_back=0 xdebug.remote_autostart=0 xdebug.remote_enable=1 33
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37. Demo 37
38. Hark, there be dragons. 38
39. Truth You will inevitably lose productivity getting step debug working. 39
40. But You will gain that time back 10 fold when you're debugging. I promise. 40
41. Tips Using repeatable scripts to configure environments will make things easier. — Ansible — PuPHPet — Docker 41
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43. Questions? 43
44. Thank You! — @litzinger — @boldminded — boldminded.com 44