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Error Identifier: generics.templateDefaultOutOfBounds

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);

/**
 * @template T of int
 * @template U of string = int
 */
class Container
{
}

Why is it reported? #

The default type specified for a @template tag is not a subtype of the template’s bound. In the example above, U is bounded by string (via of string), but the default is int, which is not a subtype of string.

How to fix it #

Change the default type so that it satisfies the bound constraint:

 <?php declare(strict_types = 1);
 
 /**
  * @template T of int
- * @template U of string = int
+ * @template U of string = string
  */
 class Container
 {
 }

Alternatively, change the bound to accommodate the desired default:

 <?php declare(strict_types = 1);
 
 /**
  * @template T of int
- * @template U of string = int
+ * @template U of string|int = int
  */
 class Container
 {
 }

How to ignore this error #

You can use the identifier generics.templateDefaultOutOfBounds to ignore this error using a comment:

// @phpstan-ignore generics.templateDefaultOutOfBounds
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: generics.templateDefaultOutOfBounds

Rules that report this error #

• PHPStan\Rules\Generics\ClassTemplateTypeRule [1]
• PHPStan\Rules\Generics\FunctionTemplateTypeRule [1]
• PHPStan\Rules\Generics\InterfaceTemplateTypeRule [1]
• PHPStan\Rules\Generics\MethodTagTemplateTypeRule [1]
• PHPStan\Rules\Generics\MethodTagTemplateTypeTraitRule [1]
• PHPStan\Rules\Generics\MethodTemplateTypeRule [1]
• PHPStan\Rules\Generics\TraitTemplateTypeRule [1]
• PHPStan\Rules\PhpDoc\IncompatiblePhpDocTypeRule [1]
• PHPStan\Rules\PhpDoc\IncompatiblePropertyHookPhpDocTypeRule [1]
• PHPStan\Rules\PhpDoc\IncompatiblePropertyPhpDocTypeRule [1]

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