Error Identifier: postInc.type

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 = new \stdClass();
$value++; // ERROR: Cannot use ++ on stdClass.

Why is it reported? #

The post-increment operator ($value++) is only valid for numeric types (int, float), strings, and in some PHP versions null and bool. Attempting to increment a value of a type that does not support this operation will either produce unexpected results or trigger a deprecation/error depending on the PHP version.

How to fix it #

Ensure the variable has a type that supports the increment operator:

 <?php declare(strict_types = 1);
 
-$value = new \stdClass();
-$value++;
+$value = 0;
+$value++;

Or perform the arithmetic explicitly on a supported type:

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

How to ignore this error #

You can use the identifier postInc.type to ignore this error using a comment:

// @phpstan-ignore postInc.type
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: postInc.type

Rules that report this error #

PHPStan\Rules\Operators\InvalidIncDecOperationRule [1]

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