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Error Identifier: argument.unpackNonIterable

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);

function doFoo(int $value): void
{
    sprintf('%s %s', ...$value);
}

Why is it reported? #

The argument unpacking operator ... can only be used with iterable values (arrays or objects implementing Traversable). Attempting to unpack a non-iterable value like an int, string, or object that does not implement Traversable is a runtime error.

How to fix it #

Pass an iterable value to the unpacking operator:

 <?php declare(strict_types = 1);
 
-function doFoo(int $value): void
+function doFoo(array $values): void
 {
-    sprintf('%s %s', ...$value);
+    sprintf('%s %s', ...$values);
 }

Or pass the arguments directly without unpacking:

 <?php declare(strict_types = 1);
 
 function doFoo(int $value): void
 {
-    sprintf('%s %s', ...$value);
+    sprintf('%s', $value);
 }

How to ignore this error #

You can use the identifier argument.unpackNonIterable to ignore this error using a comment:

// @phpstan-ignore argument.unpackNonIterable
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: argument.unpackNonIterable

Rules that report this error #

• PHPStan\Rules\Classes\ClassAttributesRule [1]
• PHPStan\Rules\Classes\ClassConstantAttributesRule [1]
• PHPStan\Rules\Classes\InstantiationRule [1]
• PHPStan\Rules\Constants\ConstantAttributesRule [1]
• PHPStan\Rules\EnumCases\EnumCaseAttributesRule [1]
• PHPStan\Rules\Functions\ArrowFunctionAttributesRule [1]
• PHPStan\Rules\Functions\CallCallablesRule [1]
• PHPStan\Rules\Functions\CallToFunctionParametersRule [1]
• PHPStan\Rules\Functions\CallUserFuncRule [1]
• PHPStan\Rules\Functions\ClosureAttributesRule [1]
• PHPStan\Rules\Functions\FunctionAttributesRule [1]
• PHPStan\Rules\Functions\ParamAttributesRule [1]
• PHPStan\Rules\Methods\CallMethodsRule [1]
• PHPStan\Rules\Methods\CallStaticMethodsRule [1]
• PHPStan\Rules\Methods\MethodAttributesRule [1]
• PHPStan\Rules\Properties\PropertyAttributesRule [1]
• PHPStan\Rules\Properties\PropertyHookAttributesRule [1]
• PHPStan\Rules\Traits\TraitAttributesRule [1]

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