sebvie/php-object-history

Record the change of a PHP object and display it in a csv file

v1.0.1 2019-11-14 13:57 UTC

Requires

• php: >=7.0

Requires (Dev)

• phpunit/phpunit: *

mit

• JSebastian Viereck

• object
• history

README

php-object-history

The package records changes of a PHP object and persists it to a storage. This can be useful if you have a stream of data and you only want the get the change set and throw away the other data to reduce memory usage.

Installation:

composer require sebvie/php-object-history

Example:

Inititate Storage and Comparer:

use PhpObjectHistory\Comparer\ObjectComparer;
use PhpObjectHistory\Storage\CsvFileStorage;
use PhpObjectHistory\ObjectHistory;

$storage = new CsvFileStorage();
$storage->setCsvFilePath($filePath);

$objectComparer = new ObjectComparer();

$objectHistory = new ObjectHistory(
    $storage,
    $objectComparer
);

Add objects:

$object = new \stdClass();
$object->testProperty = 1;
$object->testPropertyUnchanged = true;

$objectHistory->addObject($object);

$object = new \stdClass();
$object->testProperty = 2;
$object->testPropertyUnchanged = true;

$objectHistory->addObject($object);

Result is csv file containing:

testProperty,testPropertyUnchanged
1;true
2

Custom Formatters

You can add custom Formatters to flatten your object:

use PhpObjectHistory\Formatter\ObjectFormatterInterface

class ToStringFormatter implements ObjectFormatterInterface
{

    /**
     * @param object $object
     * @return string
     */
    public function format(object $object): string
    {
        return $object->__toString();
    }

    /**
     * @param object $object
     * @return bool
     */
    public function supports(object $object): bool
    {
        return method_exists($object, '__toString');
    }
}

add the formatter:

$formatter = new CustomFormatter();

$storage = new CsvFileStorage();
$storage->setCsvFilePath($filePath);
$storage->getObjectFormatterHandler()->addFormatter($formatter);

$objectComparer = new ObjectComparer();
$objectComparer->getObjectFormatterHandler()->addFormatter($formatter);

Implement custom Storages

use PhpObjectHistory\Entity\ObjectChange;

class InMemoryStorage implements StorageInterface
{
    
    /**
     * @var array
     */
    protected $result = [];
    
    /**
     * @param object $object
     */
    public function setInitialObject(object $object): void
    {
        $this->result[] = $object;
    }

    /**
     * @param ObjectChange[] $objectChanges
     */
    public function addObjectChanges(array $objectChanges): void
    {
        if (empty($objectChanges)) {
            return;
        }

        $this->result[] = $objectChanges;
    }

    /**
     * @return array
     */
    public function getResult(): array
    {
        return $this->result;
    }

}

Available Storage

• CsvFileStorage
• InMemoryStorage

Available Formatters

• DatetimeFormatter
• ToStringFormatter

ignore object properties

You can ignore changes of certian properties. This will not trigger an object change.

This is useful when you have properties like timestamps which always change but can be ignored.

$ignoreAttributes = ['boolProperty'];
$objectComparer = new ObjectComparer();
$objectComparer->setIgnoreAttributes($ignoreAttributes);