Error Identifier: staticMethod.resultDiscarded

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 Parser
{
    #[\NoDiscard]
    public static function parse(string $input): array
    {
        return explode(',', $input);
    }
}

Parser::parse('a,b,c');

Why is it reported? #

The static method is marked with the #[\NoDiscard] attribute (available since PHP 8.5), which indicates that its return value must not be ignored. Calling the method on a separate line without using the return value means the result is being discarded, which is likely a mistake.

The #[\NoDiscard] attribute is used for methods where the return value is the primary purpose of the call, and ignoring it means the call serves no useful purpose.

How to fix it #

Use the return value of the method call:

 <?php declare(strict_types = 1);
 
-Parser::parse('a,b,c');
+$result = Parser::parse('a,b,c');

If the return value is intentionally not needed, use a (void) cast to explicitly acknowledge the discard:

 <?php declare(strict_types = 1);
 
-(void) Parser::parse('a,b,c');
+$result = Parser::parse('a,b,c');

Non-ignorable error #

This error cannot be ignored using @phpstan-ignore or the ignoreErrors configuration. Non-ignorable errors indicate code that would cause a crash or a fatal error at runtime, or a fundamental problem in the analysed code that must be addressed.

Rules that report this error #

PHPStan\Rules\Methods\CallToStaticMethodStatementWithNoDiscardRule [1]

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