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Commitdabd9ce

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minor#17288 [PropertyAccess] Document nullsafe operator usage (fsoedjede)
This PR was merged into the 6.2 branch.Discussion----------[PropertyAccess] Document nullsafe operator usage<!--If your pull request fixes a BUG, use the oldest maintained branch that containsthe bug (seehttps://symfony.com/releases for the list of maintained branches).If your pull request documents a NEW FEATURE, use the same Symfony branch wherethe feature was introduced (and `6.x` for features of unreleased versions).-->Doc PR forsymfony/symfony#47511Commits-------6a5d2ee [PropertyAccess] Document nullsafe operator usage
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‎components/property_access.rst‎

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@@ -63,6 +63,9 @@ method::
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// Symfony\Component\PropertyAccess\Exception\NoSuchIndexException
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$value = $propertyAccessor->getValue($person, '[age]');
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// You can avoid the exception by adding the nullsafe operator
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$value = $propertyAccessor->getValue($person, '[age?]');
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You can also use multi dimensional arrays::
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// ...
@@ -101,6 +104,36 @@ To read from properties, use the "dot" notation::
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var_dump($propertyAccessor->getValue($person, 'children[0].firstName')); // 'Bar'
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..tip::
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You can give an object graph with nullable object.
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Given an object graph ``comment.person.profile``, where ``person`` is optional (can be null),
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you can call the property accessor with ``comment.person?.profile`` (using the nullsafe
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operator) to avoid exception.
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For example::
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class Person
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{
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}
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class Comment
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{
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public ?Person $person = null;
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public string $message;
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}
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$comment = new Comment();
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$comment->message = 'test';
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// This code throws an exception of type
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// Symfony\Component\PropertyAccess\Exception\UnexpectedTypeException
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var_dump($propertyAccessor->getValue($comment, 'person.firstname'));
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// The code now returns null, instead of throwing an exception of type
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// Symfony\Component\PropertyAccess\Exception\UnexpectedTypeException,
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var_dump($propertyAccessor->getValue($comment, 'person?.firstname')); // null
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..caution::
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Accessing public properties is the last option used by ``PropertyAccessor``.

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