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Error Identifier: property.unresolvableType

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);

class UserService
{
	/** @var string&int */
	private $identifier;
}

Why is it reported? #

The PHPDoc type for a class property contains a type that PHPStan cannot resolve. This typically happens when the type is an intersection of incompatible types (like string&int which no value can ever satisfy), references a misspelled or undefined class, or uses invalid type syntax.

In the example above, string&int is an intersection type that can never exist because no value can be both a string and an int at the same time.

How to fix it #

Correct the PHPDoc type so it references valid, compatible types:

 class UserService
 {
-	/** @var string&int */
+	/** @var string */
 	private $identifier;
 }

If the property should accept multiple types, use a union type instead of an intersection:

 class UserService
 {
-	/** @var string&int */
+	/** @var string|int */
 	private $identifier;
 }

How to ignore this error #

You can use the identifier property.unresolvableType to ignore this error using a comment:

// @phpstan-ignore property.unresolvableType
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: property.unresolvableType

Rules that report this error #

• PHPStan\Rules\PhpDoc\IncompatiblePropertyPhpDocTypeRule [1]

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