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https://issues.apache.org/jira/browse/NETBEANS-6078?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17567701#comment-17567701
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Tomáš Procházka commented on NETBEANS-6078:
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I was not able to reproduce this issue in NetBeans 14.
> Remove `mixed` type from JsonSerializable
> -----------------------------------------
>
> Key: NETBEANS-6078
> URL: https://issues.apache.org/jira/browse/NETBEANS-6078
> Project: NetBeans
> Issue Type: Improvement
> Components: php - Code Analysis
> Reporter: Fabian Grutschus
> Assignee: Tomáš Procházka
> Priority: Minor
>
> Hello,
> I get the following error when using JsonSerializable in a PHP project:
> {quote}{className} is not abstract and does not override abstract method
> jsonSerialize() in \JsonSerializable
> {quote}
> The PHP code is the following:
>
> {code:java}
> <?php
> class ClassName implements JsonSerializable {
> public function jsonSerialize(): array {
> return [];
> }
> }
> {code}
>
> As of PHP 8 {{JsonSerializable::jsonSerialize()}} has the return type mixed
> defined and Netbeans now defines that return type. But it is perfectly fine
> to change the return type of an interface method with return type mixed.
> From the RFC:
> {quote}"The mixed return type could be narrowed in a subclass as this is
> covariant and is allowed in LSP." ([https://wiki.php.net/rfc/mixed_type_v2])
> {quote}
> The error is very misleading and wrong. So I propose removing `mixed` again
> from the interface definition in Netbeans.
> Thank you!
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