Error Identifier: cast.int

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);

$value = (int) new \stdClass();

Why is it reported? #

The expression being cast to int is of a type that cannot be converted to an integer. PHP does not support casting certain types (such as objects) to int, and attempting to do so will result in an error at runtime.

In the example above, an stdClass object cannot be cast to int.

How to fix it #

Extract the numeric value from the object or expression before casting:

 <?php declare(strict_types = 1);
 
-$value = (int) new \stdClass();
+$obj = new \stdClass();
+$obj->value = 42;
+$value = (int) $obj->value;

Or ensure the expression produces a type that can be cast to int, such as string, float, or bool:

 <?php declare(strict_types = 1);
 
-$value = (int) new \stdClass();
+$value = (int) '42';

How to ignore this error #

You can use the identifier cast.int to ignore this error using a comment:

// @phpstan-ignore cast.int
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: cast.int

Rules that report this error #

PHPStan\Rules\Cast\InvalidCastRule [1]

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