Error Identifier: callable.notSupported
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 Foo
{
public function doFoo(): void
{
$callable = $this->doFoo(...);
}
}
Why is it reported? #
First-class callable syntax (foo(...)) was introduced in PHP 8.1. When PHPStan is configured to analyse code for a PHP version earlier than 8.1, using this syntax is not valid and will cause a syntax error at runtime.
This error is also reported when trying to create a callable from the new operator (e.g., new Foo(...)), which is not supported in any PHP version.
How to fix it #
Use a Closure::fromCallable() call or a closure wrapper instead of the first-class callable syntax:
<?php declare(strict_types = 1);
class Foo
{
public function doFoo(): void
{
- $callable = $this->doFoo(...);
+ $callable = Closure::fromCallable([$this, 'doFoo']);
}
}
Or configure PHPStan to analyse the code for PHP 8.1 or later by setting the phpVersion option in the configuration file.
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.