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Error Identifier: new.noConstructor

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
{
}

new Foo(1, 2, 3); // ERROR: Class Foo does not have a constructor and must be instantiated without any parameters.

Why is it reported? #

A class that does not define a __construct() method is being instantiated with arguments. Since the class has no constructor, it does not accept any parameters during instantiation. Passing arguments to new for such a class is a runtime error in PHP.

How to fix it #

Remove the arguments from the instantiation:

 <?php declare(strict_types = 1);
 
-new Foo(1, 2, 3);
+new Foo();

Or add a constructor to the class if the parameters are needed:

 <?php declare(strict_types = 1);
 
 class Foo
 {
+	public function __construct(
+		private int $a,
+		private int $b,
+		private int $c,
+	) {
+	}
 }

 new Foo(1, 2, 3);

How to ignore this error #

You can use the identifier new.noConstructor to ignore this error using a comment:

// @phpstan-ignore new.noConstructor
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: new.noConstructor

Rules that report this error #

• PHPStan\Rules\Classes\InstantiationRule [1]

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