HHVM

Get started with HHVM. Learn about running and debugging your application on HHVM and why HHVM can be so much faster than Zend PHP!

http://www.phpconference.nl/

Transcript

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2. asm89
   /
   @iam_asm89
   

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5. History
   

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7. HPHPc
   ● Open-sourced 2010
   ● 6x speedup vs Zend VM
   

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8. HPHPc
   ● Compiled PHP C++
   →
   

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9. HPHPc
   ● No eval
   ● No dynamic functions
   ● Two execution engines
   

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11. JIT compiler
    

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12. JIT compiler
    ● Zend VM
    – PHP Opcodes Runs on VM
    → →
    

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13. JIT compiler
    ● HHVM
    – PHP HHBC (ByteCode) HHIR (Intermediate Representation)
    → →
    Machine code
    →
    

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14. Getting
    started
    

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15. $ sudo wget -O - http://dl.hhvm.com/conf/hhvm.gpg.key \
    > | sudo apt-key add -
    $ echo deb http://dl.hhvm.com/ubuntu trusty main \
    > | sudo tee /etc/apt/sources.list.d/hhvm.list
    $ sudo apt-get update
    $ sudo apt-get install hhvm
    https://github.com/facebook/hhvm/wiki/Prebuilt-packages-on-Ubuntu-14.04
    

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16. Homebrew
    https://github.com/facebook/hhvm/wiki/Building-and-installing-HHVM-on-OSX-10.9
    

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17. fastcgi
    https://github.com/facebook/hhvm/wiki/FastCGI
    

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18. $ hhvm hi-dpc.php
    hi dpc!
    

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19. Can I run
    HHVM?
    

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20. http://hhvm.com/frameworks/
    

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21. Try it!
    

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22. Why HHVM?
    

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23. Not just
    PHP...
    

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24. What is at stake?
    ● Consequence of subtle bugs:
    – Corrupt database, etc..
    ● Consequence of difficult APIs:
    – Copy pasta, $needle or $haystack first
    ● Consequence of difficult refactoring
    – Bad APIs stay bad
    

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25. Technical
    debt
    

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28. ● A statically typed language for HHVM
    ● Compatible with PHP:
    – Interoperates with no overhead
    – Same representation at runtime
    ● Evolved from PHP:
    – If you know PHP, you know Hack!
    ● Designed for incremental adoption:
    – Gradual typing
    

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31. Demo
    

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32. Hack type system
    ● What must be annotated?
    – Class members
    – Function parameters
    – Return types
    The rest is inferred
    

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33. Hack types
    ● All PHP types: int, MyClassName, array
    ● Nullable: ?int, ?MyClassName
    ● Mixed: anything (careful)
    ● Tuples: (int, bool, X)
    ● Closures: (function(int): int)
    ● Collections: Vector, Map
    ● Generics: A, foo(T $x): T
    ● Constraints: foo(T $x): T
    

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34. Not just
    types
    

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35. Type annotations at run time
    function foo(int $x): void { .. }
    foo('baz');
    // Output
    Fatal error: Expected int, string given
    function bar(): bool { return 3.14; }
    // Output
    Fatal error: Expected bool, float given
    

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36. λ expressions
    

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37. PHP closure expressions
    // PHP closure syntax
    $b = 42;
    $fn = function($a) use ($b) { return $a + $b; };
    $x = $fn(42);
    

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38. Hack lambda expressions
    // PHP closure syntax
    $b = 42;
    $fn = function($a) use ($b) { return $a + $b; };
    $x = $fn(42);
    // Hack lambda syntax
    $b = 42;
    $fn = $a ==> $a + $b;
    $x = $fn(42);
    

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39. Benefits of Lambda Expressions
    ● More concise
    ● Auto capturing references
    ● Makes it easier to use callback-based APIs (wait for it..)
    

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40. Collections
    

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41. The Hack Collections framework is a set of language features and
    APIs that serve as a complete alternative to PHP arrays
    // PHP arrays
    $a = array(1, 2, 3);
    $b = array('a' => 4, 'b' => 5);
    function foo(array $c): void { .. }
    // Hack collections
    $a = Vector {1, 2, 3};
    $b = Map {'a' => 4, 'b' => 5};
    function foo(Map $c): void { .. }
    

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42. Map/filter example
    // PHP arrays
    $x = array_filter(array_map($fn1, $a), $fn2);
    

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43. Map/filter example
    // PHP arrays
    $x = array_filter(array_map($fn1, $a), $fn2);
    // Hack collections
    $x = $a->map($fn1)->filter($fn2);
    

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44. Map/filter example
    // PHP arrays
    $x = array_filter(
    array_map(
    function($a) use ($b) { return $a + $b; },
    $array
    ),
    function($a) { return $a > 10; }
    );
    

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45. Map/filter example
    // PHP arrays
    $x = array_filter(
    array_map(
    function($a) use ($b) { return $a + $b; },
    $array
    ),
    function($a) { return $a > 10; }
    );
    // Hack collections
    $x = $a->map($a ==> $a + $b)
    ->filter($a ==> $a > 10);
    

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46. Demo
    

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47. More features
    ● Async/await
    ● Constructor promotion
    ● Trailing comma's in function calls
    ● Trait requirements
    ● User attributes (<> class C {})
    ● <>
    ● ...
    

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48. Try it!
    

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49. https://github.com/facebook/hhvm
    #hhvm @ freenode IRC
    

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50. @iam_asm89
    https://joind.in/10863
    

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