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Error Identifier: return.deprecatedInterface

Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.

Code example #

<?php declare(strict_types = 1);

/** @deprecated Use NewInterface instead */
interface OldInterface
{
}

function createHandler(): OldInterface
{
    // ...
}

Why is it reported? #

This error is reported by the phpstan-deprecation-rules extension.

The native return type declaration of a function or method references an interface that is marked as @deprecated. Using a deprecated interface in a return type creates a dependency on a symbol that is scheduled for removal or replacement. Callers of this function will also depend on the deprecated interface.

How to fix it #

Replace the deprecated interface in the return type with its recommended replacement:

 <?php declare(strict_types = 1);
 
-function createHandler(): OldInterface
+function createHandler(): NewInterface
 {
     // ...
 }

If the function is itself deprecated, the error will not be reported. Mark the function as deprecated to suppress the error if the function is part of a deprecation migration:

 <?php declare(strict_types = 1);
 
+/** @deprecated Use createNewHandler() instead */
 function createHandler(): OldInterface
 {
     // ...
 }

How to ignore this error #

You can use the identifier return.deprecatedInterface to ignore this error using a comment:

// @phpstan-ignore return.deprecatedInterface
codeThatProducesTheError();

You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:

parameters:
	ignoreErrors:
		-
			identifier: return.deprecatedInterface

Rules that report this error #

• PHPStan\Rules\Deprecations\RestrictedDeprecatedClassNameUsageExtension [1] phpstan/phpstan-deprecation-rules

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