Make your own annotations with Doctrine Annotation

Code
<?php

use Doctrine\Common\Annotations\SimpleAnnotationReader;

class Foo
{
    /**
     * @MyAnnotation(defaultValue="bar")
     */
    private $bar;
}

/**
 * @Annotation
 */
class MyAnnotation
{
    public $defaultValue;
}

$ref = new ReflectionClass('Foo');
$prop = $ref->getProperty('bar');

$parser = new SimpleAnnotationReader();
// or getPropertyAnnotations to get all annotations of a property
$myAnnotation = $parser
    ->getPropertyAnnotation($prop, 'MyAnnotation');

echo $myAnnotation->defaultValue;
Result
bar