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Package var-exporter
Short Description Allows exporting any serializable PHP data structure to plain PHP code
License MIT
Homepage https://symfony.com
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Informations about the package var-exporter
VarExporter Component
The VarExporter component provides various tools to deal with the internal state of objects:
VarExporter::export()allows exporting any serializable PHP data structure to plain PHP code. While doing so, it preserves all the semantics associated with the serialization mechanism of PHP (__wakeup,__sleep,Serializable,__serialize,__unserialize);Instantiator::instantiate()creates an object and sets its properties without calling its constructor nor any other methods;Hydrator::hydrate()can set the properties of an existing object;Lazy*Traitcan make a class behave as a lazy-loading ghost or virtual proxy.
VarExporter::export()
The reason to use VarExporter::export() vs serialize() or
igbinary is performance: thanks to
OPcache, the resulting code is significantly faster and more memory efficient
than using unserialize() or igbinary_unserialize().
Unlike var_export(), this works on any serializable PHP value.
It also provides a few improvements over var_export()/serialize():
- the output is PSR-2 compatible;
- the output can be re-indented without messing up with
\ror\nin the data; - missing classes throw a
ClassNotFoundExceptioninstead of being unserialized toPHP_Incomplete_Classobjects; - references involving
SplObjectStorage,ArrayObjectorArrayIteratorinstances are preserved; Reflection*,IteratorIteratorandRecursiveIteratorIteratorclasses throw an exception when being serialized (their unserialized version is broken anyway, see https://bugs.php.net/76737).
Instantiator and Hydrator
Instantiator::instantiate($class) creates an object of the given class without
calling its constructor nor any other methods.
Hydrator::hydrate() sets the properties of an existing object, including
private and protected ones. For example:
Lazy Proxies
Since version 8.4, PHP provides support for lazy objects via the reflection API. This native API works with concrete classes. It doesn't with abstracts nor with internal ones.
This components provides helpers to generate lazy objects using the decorator pattern, which works with abstract or internal classes and with interfaces:
In addition, this component provides traits and methods to aid in implementing the ghost and proxy strategies in previous versions of PHP. Those are deprecated when using PHP 8.4.
