Error Identifier: requireImplements.nonObject

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);

/**
 * @phpstan-require-implements int
 */
trait MyTrait // ERROR: PHPDoc tag @phpstan-require-implements contains non-object type int.
{
}

Why is it reported? #

The @phpstan-require-implements PHPDoc tag must reference an interface (object) type. Scalar types like int, string, bool, union types, or other non-object types cannot be implemented by a class and are therefore not valid in this tag.

How to fix it #

Replace the non-object type with an interface:

 <?php declare(strict_types = 1);
 
+interface Countable
+{
+	public function count(): int;
+}
+
 /**
- * @phpstan-require-implements int
+ * @phpstan-require-implements Countable
  */
 trait MyTrait
 {
 }

If the requirement is about a specific type constraint that is not an interface, consider whether @phpstan-require-extends (for classes) or another mechanism is more appropriate.

How to ignore this error #

You can use the identifier requireImplements.nonObject to ignore this error using a comment:

// @phpstan-ignore requireImplements.nonObject
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: requireImplements.nonObject

Rules that report this error #

PHPStan\Rules\PhpDoc\RequireImplementsDefinitionTraitRule [1]

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