Error Identifier: smaller.invalid

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(\stdClass $object, int $number): void
{
	if ($object < $number) {
		// ...
	}
}

Why is it reported? #

The < (less than) comparison is used between types that cannot be meaningfully compared, resulting in a TypeError at runtime. Since PHP 8.0, comparing incompatible types with relational operators (<, >, <=, >=) throws a TypeError. In this example, comparing a \stdClass object with an int is not a valid operation.

How to fix it #

Compare values of compatible types. Extract a comparable value from the object first:

 <?php declare(strict_types = 1);
 
 function doFoo(\stdClass $object, int $number): void
 {
-	if ($object < $number) {
+	if ($object->value < $number) {
 		// ...
 	}
 }

Or ensure both operands have comparable types:

 <?php declare(strict_types = 1);
 
-function doFoo(\stdClass $object, int $number): void
+function doFoo(int $a, int $number): void
 {
-	if ($object < $number) {
+	if ($a < $number) {
 		// ...
 	}
 }

How to ignore this error #

You can use the identifier smaller.invalid to ignore this error using a comment:

// @phpstan-ignore smaller.invalid
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: smaller.invalid

Rules that report this error #

PHPStan\Rules\Operators\InvalidComparisonOperationRule [1]

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