Getting started with PHP core development - Dutch PHP Conference 2018

Joind.in: https://joind.in/talk/4783a

While PHP’s open source community is thriving, only a relatively small number of PHP developers contribute to the number one tool they use on a daily basis: PHP itself. Although it may seem daunting to help out on a project written in C, requiring compilation and linking, getting started is actually pretty easy. In this talk I would like to share my own recent experiences of beginning to contribute to PHP itself. We will see different ways to contribute and cover some practical tips, workflows and resources, so you can start giving back to your programming language straight away!

Transcript

1. Getting started with PHP core development
   @arnoutboks
   Arnout Boks
   #dpc18
   08-06-2018
   

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2. @arnoutboks #dpc18
   PHP Open Source projects
   

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3. @arnoutboks #dpc18
   PHP Open Source projects
   4175 contributors
   418 contributors
   689 contributors
   1497 contributors
   

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4. @arnoutboks #dpc18
   PHP Open Source projects
   4175 contributors
   418 contributors
   689 contributors
   1497 contributors
   

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5. @arnoutboks #dpc18
   PHP Open Source projects
   4175 contributors
   418 contributors
   689 contributors
   1497 contributors
   497 contributors?
   

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6. @arnoutboks #dpc18
   We all use PHP intensively
   Why not contribute something back?
   

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7. @arnoutboks #dpc18
   The catch
   

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8. @arnoutboks #dpc18
   The catch
   

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9. @arnoutboks #dpc18
   The core
   

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10. @arnoutboks #dpc18
    The core
    

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11. @arnoutboks #dpc18
    My own journey
    to the core
    

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12. @arnoutboks #dpc18
    Once upon a time…
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagName(
    "bar"
    )->length;
    

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13. @arnoutboks #dpc18
    Once upon a time…
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagName(
    "bar"
    )->length; // returns 2
    

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14. @arnoutboks #dpc18
    Once upon a time…
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagNameNS(
    "http://www.example.com", "bar"
    )->length;
    

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15. @arnoutboks #dpc18
    Once upon a time…
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagNameNS(
    "http://www.example.com", "bar"
    )->length; // returns 1
    

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16. @arnoutboks #dpc18
    Once upon a time…
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagNameNS(
    "", "bar"
    )->length;
    

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17. @arnoutboks #dpc18
    Once upon a time…
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagNameNS(
    "", "bar"
    )->length; // returns 0!
    

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18. @arnoutboks #dpc18
    Once upon a time…
    

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19. Reporting bugs
    Gotta squash them all
    

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20. @arnoutboks #dpc18
    bugs.php.net
    PHP bug tracker
    

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21. @arnoutboks #dpc18
    Write good bug reports
    https://bugs.php.net/how-to-report.php
    

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22. @arnoutboks #dpc18
    Search for existing bugs
    

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23. @arnoutboks #dpc18
    Sharpen bug details
    Report different platform/version:
    Don’t post “me too” comments –
    Do post other relevant details
    

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24. @arnoutboks #dpc18
    Help triaging bugs!
    https://bugs.php.net/random
    

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25. Building PHP from git
    Living on the edge
    

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26. @arnoutboks #dpc18
    1. Install dependencies
    • git
    • build-essential
    • autoconf
    • automake
    • libtool
    • re2c
    • bison
    • libxml2-dev
    Using apt-get, yum or similar
    

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27. @arnoutboks #dpc18
    2. Clone php-src
    $ git clone https://github.com/php/php-
    src.git
    

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28. @arnoutboks #dpc18
    3. Generate ./configure script
    $ ./buildconf
    Uses autoconf to build ./configure from:
    • configure.ac
    • acinclude.m4
    • sapi/*/config.m4
    • ext/*/config.m4
    

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29. @arnoutboks #dpc18
    4. Run ./configure script
    $ ./configure
    Configure a default PHP build:
    $ ./configure --disable-cgi --disable-dom
    --enable-opcache --with-sqlite3=/path
    /to/sqlite3
    Customize extensions/SAPIs:
    $ ./configure --help
    See all options
    

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30. @arnoutboks #dpc18
    5. Compile
    $ make
    $ make –j`nproc`
    To use all available cores (faster):
    

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31. @arnoutboks #dpc18
    6. Run!
    $ sapi/cli/php --version
    Binaries are in sapi/cli/php and sapi/cgi/php-cgi:
    

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32. @arnoutboks #dpc18
    Subsequent builds
    $ make
    Just run
    Recompiles only files that have changed
    

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33. @arnoutboks #dpc18
    Cleanup scripts
    $ make clean
    # try again
    $ make distclean
    # try again
    $ ./buildconf –force
    $ ./configure
    # try again
    If compilation fails, try (subsequently):
    Might be needed after git pull/git checkout
    

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34. @arnoutboks #dpc18
    https://wiki.php.net/
    internals/windows/stepbystepbuild
    Building for Windows
    

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35. @arnoutboks #dpc18
    

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36. @arnoutboks #dpc18
    • ramsey/vagrant-php-src-
    dev
    • rlerdorf/php7dev
    Vagrant boxes for compiling PHP
    

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37. @arnoutboks #dpc18
    Or use Docker:
    aboks/php-src-devtools
    

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38. @arnoutboks #dpc18
    Using php-src-devtools
    $ composer global require aboks/php-src-
    devtools
    $ git clone https://github.com/php/php-
    src.git && cd php-src
    $ php-src-devtools build
    

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39. Running tests for PHP
    Human-driven CI
    

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40. @arnoutboks #dpc18
    Running tests
    $ sapi/cli/php run-tests.php –p
    `pwd`/sapi/cli/php
    

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41. @arnoutboks #dpc18
    Running tests
    $ sapi/cli/php run-tests.php –p
    `pwd`/sapi/cli/php
    $ sapi/cli/php run-tests.php -P
    

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42. @arnoutboks #dpc18
    Running tests
    $ sapi/cli/php run-tests.php –p
    `pwd`/sapi/cli/php
    $ sapi/cli/php run-tests.php -P
    $ make test
    # (or, with php-src-devtools)
    $ php-src-devtools test
    

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43. @arnoutboks #dpc18
    Running tests
    $ make test
    […]
    PASS Trivial "Hello World" test [tests/basic/001.phpt]
    SKIP Check libcurl config on windows
    [ext/curl/tests/check_win_config.phpt] reason: for
    windows only
    FAIL Compiled regex cache limit [ext/pcre/tests/cache_limit.phpt]
    XFAIL Inconsistencies when accessing protected members
    [Zend/tests/access_modifiers_008.phpt]
    XFAIL REASON: Discussion: http://marc.info/?l=php-
    internals&m=120221184420957&w=2
    […10000 more lines of output…]
    

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44. @arnoutboks #dpc18
    Running tests
    $ make test
    […]
    =========================================
    TEST RESULT SUMMARY
    -----------------------------------------
    Number of tests : 14896 12520
    Tests skipped : 2376 ( 16.0%) --------
    Tests warned : 2 ( 0.0%) ( 0.0%)
    Tests failed : 175 ( 1.2%) ( 1.4%)
    Expected fail : 44 ( 0.3%) ( 0.4%)
    Tests passed : 12299 ( 82.6%) ( 98.2%)
    -----------------------------------------
    Time taken : 2937 seconds
    

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45. @arnoutboks #dpc18
    Running tests
    $ make test
    […]
    You may have found a problem in PHP.
    This report can be automatically sent to the PHP QA team at
    http://qa.php.net/reports and
    http://news.php.net/php.qa.reports
    This gives us a better understanding of PHP's behavior.
    If you don't want to send the report immediately you can
    choose
    option "s" to save it. You can then email it to qa-
    reports@lists.php.net later.
    Do you want to send this report now? [Yns]:|
    

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46. @arnoutboks #dpc18
    Options for running tests
    $ make test TESTS=path/to/my/test.phpt
    $ make test TESTS=ext/dom
    $ make test TESTS="--verbose ext/dom"
    $ make test TESTS=--help
    

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47. Writing tests for PHP
    “the best bug report”
    

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48. @arnoutboks #dpc18
    Steps to reproduce for bug #67474
    Test script:
    ---------------
    $doc = new DOMDocument();
    $doc->loadXML('');
    $list = $doc->getElementsByTagNameNS('', 'a');
    echo $list->length;
    Expected result:
    ----------------
    1
    Actual result:
    --------------
    0
    

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49. @arnoutboks #dpc18
    Testing tools
    Typical PHP project:
    • Written in PHP
    • Tests written in PHP
    (PHPUnit, PHPSpec, CodeCeption)
    The PHP core:
    • Written in C
    • Tests written in …
    

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50. @arnoutboks #dpc18
    PHP is tested using
    PHPT tests
    No C skills required
    

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51. @arnoutboks #dpc18
    PHPT tests
    • Basically plaintext with sections
    • Some sections (can) contain PHP code
    • Let PHP print some output…
    • …and check against expected output
    

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52. @arnoutboks #dpc18
    Very simple PHPT test
    --TEST--
    Basic arithmetic - addition
    --FILE--
    var_dump(42 + 1);
    ?>
    --EXPECT--
    int(43)
    

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53. @arnoutboks #dpc18
    Very simple PHPT test
    --TEST--
    Basic arithmetic - addition
    --FILE--
    var_dump(42 + 1);
    ?>
    --EXPECT--
    int(43)
    

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54. @arnoutboks #dpc18
    PHPT test for bug #67474
    --TEST--
    Bug #67474 getElementsByTagNameNS and default namespace
    --FILE--
    $doc = new DOMDocument();
    $doc->loadXML('');
    $list = $doc->getElementsByTagNameNS('', 'a');
    var_dump($list->length);
    ?>
    --EXPECT--
    int(1)
    

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55. @arnoutboks #dpc18
    Running our PHPT test
    $ make test TESTS=ext/dom/tests/bug67474.phpt
    […]
    =============================================
    FAILED TEST SUMMARY
    ---------------------------------------------
    Bug #67474 getElementsByTagNameNS and default
    namespace [ext/dom/tests/bug67474.phpt]
    =============================================
    

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56. @arnoutboks #dpc18
    Running our PHPT test
    Files generated for our failing test:
    bug67474.php contents of the FILE section
    bug67474.sh shell script for running the .php file
    bug67474.exp expected output
    bug67474.out actual output
    bug67474.diff diff between expected and actual
    bug67474.log log file, including the expected and
    actual output
    

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57. @arnoutboks #dpc18
    Running our PHPT test
    $ cat ext/dom/tests/bug67474.log
    ---- EXPECTED OUTPUT
    int(1)
    ---- ACTUAL OUTPUT
    int(0)
    ---- FAILED
    

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58. @arnoutboks #dpc18
    Running our PHPT test
    

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59. @arnoutboks #dpc18
    Sections in PHPT files
    GET, POST, PUT, COOKIE, HEADERS: Simulate HTTP input
    to the PHP script in FILE
    --GET--
    foo=bar&baz=qux
    --COOKIE--
    foo=bar;baz=qux
    --FILE--
    
    --EXPECT--
    string(6) "barbar"
    

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60. @arnoutboks #dpc18
    Sections in PHPT files
    EXPECTF, EXPECTREGEX: Expect the output to match a
    certain format
    --FILE--
    $fp = fopen(__FILE__, 'r');
    var_dump($fp);
    ?>
    --EXPECTF--
    resource(%d) of type (stream)
    

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61. @arnoutboks #dpc18
    More sections in PHPT files
    SKIPIF: Skips the test if the code in SKIPIF generates
    output containing ‘skip’ somewhere
    CLEAN: Cleans up after the test
    INI: Specifies custom php.ini directives for the test
    XFAIL: Indicates the test is expected to fail, and gives an
    explanation why
    

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62. @arnoutboks #dpc18
    Easy way to get started
    without C skills
    

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63. @arnoutboks #dpc18
    Finding untested code
    gcov.php.net
    

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64. @arnoutboks #dpc18
    Resources
    • https://qa.php.net/write-test.php
    • https://www.sammyk.me/compiling-php-from-source-
    writing-tests-for-php-source
    • https://phptestfest.org/tutorials/
    • http://www.phpinternalsbook.com/#testing-php-
    source
    • https://github.com/PHPTestFestBrasil/phptt
    • https://gist.github.com/SammyK/4a5cf70d0973731d0c
    85b151a323ea2d
    

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65. Editing the PHP source
    Your own custom PHP
    

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66. @arnoutboks #dpc18
    A shot at fixing #67474: recap
    
    
    
    
    $doc = /* … (DOMDocument) */;
    $doc->getElementsByTagNameNS(
    "", "bar"
    )->length; // returns 0!
    

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67. @arnoutboks #dpc18
    A shot at fixing #67474
    php-src/ext/dom/
    • attr.c
    • document.c
    • dom_ce.h
    • dom_fe.h
    • element.c
    • node.c
    • php_dom.c
    • xpath.c
    • …
    

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68. @arnoutboks #dpc18
    A shot at fixing #67474
    const zend_function_entry php_dom_document_class_functions[] = {
    // ...
    PHP_FALIAS(createAttributeNS,
    dom_document_create_attribute_ns,
    arginfo_dom_document_create_attribute_ns)
    PHP_FALIAS(getElementsByTagNameNS,
    dom_document_get_elements_by_tag_name_ns,
    arginfo_dom_document_get_elements_by_tag_name_ns)
    PHP_FALIAS(getElementById, dom_document_get_element_by_id,
    arginfo_dom_document_get_element_by_id)
    // ...
    PHP_ME(domdocument, __construct,
    arginfo_dom_document_construct, ZEND_ACC_PUBLIC)
    PHP_FE_END
    };
    

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69. @arnoutboks #dpc18
    C macros
    

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70. @arnoutboks #dpc18
    C macros
    #define MIN(a,b) a < b ? a : b
    int c = MIN(42,7)
    // ^ is converted into
    // int c = 42 < 7 ? 42 : 7
    

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71. @arnoutboks #dpc18
    A shot at fixing #67474
    const zend_function_entry php_dom_document_class_functions[] = {
    // ...
    PHP_FALIAS(createAttributeNS,
    dom_document_create_attribute_ns,
    arginfo_dom_document_create_attribute_ns)
    PHP_FALIAS(getElementsByTagNameNS,
    dom_document_get_elements_by_tag_name_ns,
    arginfo_dom_document_get_elements_by_tag_name_ns)
    PHP_FALIAS(getElementById, dom_document_get_element_by_id,
    arginfo_dom_document_get_element_by_id)
    // ...
    PHP_ME(domdocument, __construct,
    arginfo_dom_document_construct, ZEND_ACC_PUBLIC)
    PHP_FE_END
    };
    

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72. @arnoutboks #dpc18
    A shot at fixing #67474
    PHP_FUNCTION(dom_document_get_elements_by_tag_name_ns)
    {
    // ...
    if (zend_parse_method_parameters(ZEND_NUM_ARGS(), getThis(),
    "Oss", &id, dom_document_class_entry, &uri, &uri_len, &name, &name_len) ==
    FAILURE) {
    return;
    }
    // ...
    local = xmlCharStrndup(name, name_len);
    nsuri = xmlCharStrndup(uri, uri_len);
    dom_namednode_iter(intern, 0, namednode, NULL, local, nsuri);
    }
    

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73. @arnoutboks #dpc18
    zend_parse_parameters (‘ZPP’)
    PHP_FUNCTION(dom_document_get_elements_by_tag_name_ns)
    {
    // ...
    if (zend_parse_method_parameters(ZEND_NUM_ARGS(), getThis(),
    "Oss", &id, dom_document_class_entry, &uri, &uri_len, &name, &name_len) ==
    FAILURE) {
    return;
    }
    // ...
    local = xmlCharStrndup(name, name_len);
    nsuri = xmlCharStrndup(uri, uri_len);
    dom_namednode_iter(intern, 0, namednode, NULL, local, nsuri);
    }
    s: string
    s: string
    O: object of given class
    

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74. @arnoutboks #dpc18
    zend_parse_parameters (‘ZPP’)
    Specifier Type
    a array
    b boolean
    d double/float
    l long/int
    o object (any type)
    O object (specific type)
    r resource
    s string
    z mixed
    

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75. @arnoutboks #dpc18
    zend_parse_parameters (‘ZPP’)
    Modifier Effect
    * variable number of arguments (0 or more)
    + variable number of arguments (1 or more)
    ! optional argument
    | remaining arguments are optional
    See README.PARAMETER_PARSING_API
    

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76. @arnoutboks #dpc18
    A shot at fixing #67474
    PHP_FUNCTION(dom_document_get_elements_by_tag_name_ns)
    {
    // ...
    if (zend_parse_method_parameters(ZEND_NUM_ARGS(), getThis(),
    "Oss", &id, dom_document_class_entry, &uri, &uri_len, &name, &name_len) ==
    FAILURE) {
    return;
    }
    // ...
    local = xmlCharStrndup(name, name_len);
    nsuri = xmlCharStrndup(uri, uri_len);
    dom_namednode_iter(intern, 0, namednode, NULL, local, nsuri);
    }
    

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77. @arnoutboks #dpc18
    A shot at fixing #67474
    xmlNode *dom_get_elements_by_tag_name_ns_raw(
    xmlNodePtr nodep, char *ns, char *local /* ... */
    ) { // ...
    if (
    ns == NULL ||
    (nodep->ns != NULL && (
    xmlStrEqual(nodep->ns->href, (xmlChar *)ns) ||
    xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)
    ))
    ) { /* namespace matches */ } // ...
    }
    Eventually:
    

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78. @arnoutboks #dpc18
    A shot at fixing #67474
    xmlNode *dom_get_elements_by_tag_name_ns_raw(
    xmlNodePtr nodep, char *ns, char *local /* ... */
    ) { // ...
    if (
    ns == NULL ||
    (nodep->ns != NULL && (
    xmlStrEqual(nodep->ns->href, (xmlChar *)ns) ||
    xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)
    ))
    ) { /* namespace matches */ } // ...
    }
    Eventually:
    element to ‘test’ filter namespace and
    local name
    

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79. @arnoutboks #dpc18
    A shot at fixing #67474
    xmlNode *dom_get_elements_by_tag_name_ns_raw(
    xmlNodePtr nodep, char *ns, char *local /* ... */
    ) { // ...
    if (
    ns == NULL ||
    (nodep->ns != NULL && (
    xmlStrEqual(nodep->ns->href, (xmlChar *)ns) ||
    xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)
    ))
    ) { /* namespace matches */ } // ...
    }
    Eventually:
    “no namespace filter”
    

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80. @arnoutboks #dpc18
    A shot at fixing #67474
    xmlNode *dom_get_elements_by_tag_name_ns_raw(
    xmlNodePtr nodep, char *ns, char *local /* ... */
    ) { // ...
    if (
    ns == NULL ||
    (nodep->ns != NULL && (
    xmlStrEqual(nodep->ns->href, (xmlChar *)ns) ||
    xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)
    ))
    ) { /* namespace matches */ } // ...
    }
    Eventually:
    “node has a namespace”, and
    “it matches the filter”
    or “filter is a wildcard”
    

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81. @arnoutboks #dpc18
    A shot at fixing #67474
    xmlNode *dom_get_elements_by_tag_name_ns_raw(
    xmlNodePtr nodep, char *ns, char *local /* ... */
    ) { // ...
    if (
    ns == NULL ||
    (nodep->ns == NULL && !strcmp(ns, "")) ||
    (nodep->ns != NULL && (
    xmlStrEqual(nodep->ns->href, (xmlChar *)ns) ||
    xmlStrEqual((xmlChar *)"*", (xmlChar *)ns)
    ))
    ) { /* namespace matches */ } // ...
    }
    Fix:
    “node has empty namespace”, and
    “filter is empty namespace”
    

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82. @arnoutboks #dpc18
    A shot at fixing #67474
    $ make test TESTS=ext/dom/tests/bug67474.phpt
    […]
    =============================================
    Running selected tests.
    PASS Bug #67474 getElementsByTagNameNS and
    default namespace [ext/dom/tests/bug67474.phpt]
    =============================================
    Number of tests : 1 1
    Tests passed : 1 (100.0%) (100.0%)
    

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83. @arnoutboks #dpc18
    PR for #67474
    Submit bug fixes to the oldest supported branch:
    http://php.net/supported-versions.php
    

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84. @arnoutboks #dpc18
    The Release Managers
    PHP
    7.1
    Davey Shafik
    @dshafik
    Joe Watkins
    @krakjoe
    PHP
    7.2
    Remi Collet
    @RemiCollet
    Sara Golemon
    @SaraMG
    PHP
    7.3
    Christoph M.
    Becker
    @cmbecker69
    Stanislav
    Malyshev
    @smalyshev
    

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85. @arnoutboks #dpc18
    PR for #67474: 2 hours later…
    

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86. @arnoutboks #dpc18
    It’s not THAT difficult
    • Read past the C details and macros
    • Focus on the logic
    • See where variables come from and go to
    • Try and see what happens
    • Rely on the tests
    

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87. @arnoutboks #dpc18
    You can do this!
    

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88. @arnoutboks #dpc18
    Bug fixes vs. features
    • Bug fixes
    • PR against oldest supported branch
    • No RFC needed
    • Refer to bug in bug tracker
    • Features
    • PR against master
    • Formal RFC needed
    

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89. @arnoutboks #dpc18
    RFC Process
    • Introduce idea, measure initial reaction
    • Formal proposal
    • Discussion period
    • Voting
    See https://wiki.php.net/rfc/howto &
    https://benramsey.com/talks/2015/06/dpc-contributing-core/
    

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90. @arnoutboks #dpc18
    Resources
    • http://php.net/internals
    • https://wiki.php.net/internals
    • https://wiki.php.net/internals/references
    • http://www.phpinternalsbook.com/
    • http://blog.jpauli.tech/
    • https://nikic.github.io/
    • https://blog.ircmaxell.com/search/label/PHP-Internals
    • https://www.sammyk.me/how-to-find-and-patch-a-
    bug-in-php-source-php-internals
    • https://externals.io
    

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91. @arnoutboks #dpc18
    Some time later…
    

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92. Documentation for PHP
    Contributing to the manual
    

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93. @arnoutboks #dpc18
    edit.php.net
    PHP Docbook Online Editor
    ‘Easiest’ way to get started
    (if you can figure out how it works)
    

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94. @arnoutboks #dpc18
    edit.php.net
    

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95. @arnoutboks #dpc18
    edit.php.net
    

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96. @arnoutboks #dpc18
    edit.php.net
    

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97. @arnoutboks #dpc18
    1. Find the correct file
    Under “All files” in the left menu
    Top-level directory per language
    • reference//
    • functions/.xml
    • .xml
    • /.xml
    • language/.xml
    

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98. @arnoutboks #dpc18
    1. Find the correct file
    Tip: Use the “edit” link from the documentation itself
    

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99. @arnoutboks #dpc18
    2. Make your changes
    Documentation is written using DocBook XML
    http://tdg.docbook.org/tdg/5.2/
    

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100. @arnoutboks #dpc18
     2. Make your changes
     Documentation is written using DocBook XML
     (or just peek in other docs)
     

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101. @arnoutboks #dpc18
     3. Preview changes
     Seems broken at the moment
     

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102. @arnoutboks #dpc18
     4. Submit as patch
     

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103. @arnoutboks #dpc18
     Tip: submit a docs patch
     instead of user note
     

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104. @arnoutboks #dpc18
     Don’t like edit.php.net?
     Make it better!
     

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105. @arnoutboks #dpc18
     Don’t like edit.php.net?
     Or set up your own development environment:
     https://www.sammyk.me/how-to-contribute-to-php-
     documentation
     

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106. @arnoutboks #dpc18
     Where to help?
     • Bugs of type “Doc” in bug tracker
     • check-missing-docs.php
     • “Failures to meet strict standards”
     (in edit.php.net sidebar)
     • Translations
     • Missing translations
     • Out-of-date translations
     • Translations needing review
     • Translations with errors
     

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107. @arnoutboks #dpc18
     Where to help?
     

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108. Recap
     Ways to contribute to PHP
     

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109. @arnoutboks #dpc18
     Numerous ways to contribute
     • Bug reports
     • Bug triaging
     • Running tests
     • Writing tests
     • Bug fixes
     • New features
     • Documentation patches
     • Documentation translations
     • Tools
     

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110. @arnoutboks #dpc18
     Why contribute?
     • Get ‘own’ bugs fixed
     • Fix ‘own’ bugs
     • Make PHP better
     • Make PHP more popular
     • Learn PHP
     • Learn C
     • Give back to the community
     

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111. @arnoutboks #dpc18
     You don’t have to be an expert
     to contribute to the PHP core
     

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112. @arnoutboks #dpc18
     Feedback & Questions
     @arnoutboks
     @arnoutboks
     @aboks
     Arnout Boks
     Please leave your feedback on joind.in:
     https://joind.in/talk/4783a
     

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113. @arnoutboks #dpc18
     Image Credits
     • https://photojournal.jpl.nasa.gov/jpeg/PIA19058.jpg
     • https://www.flickr.com/photos/vivianejl/22990832
     • https://www.flickr.com/photos/dhuiz/13609080315/
     • https://www.flickr.com/photos/gotovan/8671348572
     • https://www.flickr.com/photos/sidelong/246816211
     • https://www.flickr.com/photos/pezon64/23764268828
     • https://www.flickr.com/photos/crdot/6855538268/
     • https://www.flickr.com/photos/borkurdotnet/9682277597
     

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