SilverStripe PHP5

PHP5.4 And SilverStripeOr me geeking off about the latest thing I managed to compile

Who am I?Simon Welsh - @simon_wDeveloper for RentBoxStudying at VUWhttp://simon.geek.nz/

AgendaTraitsJSONOther things

Other thingsBinary number format 0b00101000 0b00000010Callable type hint function doStuffWithCallback($input, callback $callback) { ... }Short array syntax [4, 5, ‘index’ => ‘value’]Improved parse error messages Parse error: syntax error, unexpected :: (T_PAAMAYIM_NEKUDOTAYIM)in - on line 2

Other things<?= Shouldn’t use with SilverStripe, but now always enabled (even without short tags)Array dereferencing $secondItem = DataObject::get(‘SiteTree’)[2];Removed functionality Safe mode Magic quotes Register globals break/continue $var;

JSONConvert::raw2json() just calls json_encode()Current output isn’t very useful:DataObject: {"destroyed":false,"class":"Member"}DataObjectSet: {"class":"DataObjectSet"}Could use JSONDataFormatter Instance methods do the converting Non-recursive Can’t add information not in a ﬁeld/relation Code assumes it’s called as part of the API

JSONThe JsonSerializable interface andjsonSerialize() method tie intojson_encode()A class implementing JsonSerializablereturns what gets serialised in thejsonSerialize() method.Allows for a completely customisableserialisation process.

JSONAs it is accessed through json_encode(),it allows for recursion.Convert::raw2json() uses it automaticallyin 5.4, and it can even be emulated in ≤5.3.You can deﬁne everything that goes intoit, wether that’s ﬁelds, relations or someother calculated value.

JSONclass DataObject extends ViewableData implementsDataObjectInterface, i18nEntityProvider { ......class DataObjectSet extends ViewableData implementsIteratorAggregate, Countable { ......

JSONclass DataObject extends ViewableData implementsDataObjectInterface, i18nEntityProvider,JsonSerializable { public function jsonSerialize() { return $this->record; } ......class DataObjectSet extends ViewableData implementsIteratorAggregate, Countable, JsonSerializable { public function jsonSerialize() { return $this->items; } ......

JSONBefore:{"destroyed":false,"class":"Member"}{"class":"DataObjectSet"}After:{"ClassName":"Member","Created":"2011-08-2018:15:59","LastEdited":"2011-08-2018:35:25","FirstName":"DefaultAdmin","NumVisit":"1","LastVisited":"2011-08-2022:09:51.437521","Bounced":"0","Locale":"en_NZ","FailedLoginCount":"0","ID":1,"RecordClassName":"Member"}[{"ClassName":"Member","Created":"2011-08-2018:15:59","LastEdited":"2011-08-2018:35:25","FirstName":"DefaultAdmin","NumVisit":"1","LastVisited":"2011-08-2022:09:51.437521","Bounced":"0","Locale":"en_NZ","FailedLoginCount":"0","ID":1,"RecordClassName":"Member"}]

JSONpublic function jsonSerialize() { $extended = $this->extendedCan(jsonSerialize, null); if($extended !== null) { return $extended; } return $this->record;}[ { "Date": "11 Feb 2011", "Issue": "Grounds", "Notes": "Grounds are very mature and the whole section needs to be ...", "Fixed": true, "FixedDate": "19 Apr 2011", "How": null, "Cost": "$0.00", "Type": "Outdoor Maintenance", "Urgent": false, "Contractor": null, "ID": 9, "Actions": [ { "ID": 7, "Title": "Grounds and stove", "Finished": false, } ] }, { ...

TraitsHorizontal code reuse“In computer programming, a trait is acollection of methods, used as a "simpleconceptual model for structuring objectoriented programs".”Similar to DataObjectDecorators/Extensions

TraitsSimilar deceleration to classes andinterfaces:trait MyTrait { ... }Can only deﬁne methods, so no propertiesMethods can be abstract and staticMethod visibility need not be respectedTraits can be composed from other traits

TraitsTraits inject their methods into the classthat is including the traitInjected methods can be renamed, havetheir visibility changed and cherry-pickedin the case of conﬂictsDefault precedence for methods is currentclass, traits, then inherited methods.

TraitsTraits are mainly for horizontal codereuse. That is having the same code indifferent classes in different parts ofthe inheritance structure.Allows for less code duplication withoutsome nasty inheritance structure.

Traitsspl_autoload_register(function($className) { if(strtolower(substr($className, -5)) == trait) { if(file_exists(__DIR__ . "/traits/$className.php")) { include __DIR__ . "/traits/$className.php"; } }});

Traitstrait AddressData { public function setAddressData($data) { $data = json_decode($data, true); ... $this->Street = sprintf(%s%s %s, $data[number],empty($data[alpha]) ? : $data[alpha], $data[street]); ... if($suburb && $suburb->exists()) { $this->SuburbID = $suburb->ID; } else { $suburb = new Suburb; $suburb->Name = $data[suburb]; $suburb->DistrictID = $this->DistrictID; $this->SuburbID = $suburb->write(); } $this->setField(AddressData, json_encode($data)); }}

Traitsclass Property extends DataObject { use AddressData; public static $db = [ ... ‘AddressData’ => ‘Text’, ...];}class CustomMember extends DataObjectDecorator { use AddressData; public function extraStatics() { return [‘db’ => [ ... ‘AddressData’ => ‘Text’, ...]]; }}

More InformationPHP documentation: http://php.net/JsonSerializable http://php.net/traitsCurrent change log: http://svn.php.net/viewvc/php/php-src/branches/ PHP_5_4/NEWS?view=markupSVN Instructions: http://php.net/svn.phpThese slides: http://simon.geek.nz/silverstripe-and-php5-4-talk/ http://assets.simon.geek.nz/Talks/SilverStripe-PHP5.4.pdf

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SilverStripe PHP5

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