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Edit File: InvalidIncDecOperationRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Operators;

use PHPStan\Type\ErrorType;
use PHPStan\Type\VerbosityLevel;

class InvalidIncDecOperationRule implements \PHPStan\Rules\Rule
{

/** @var bool */
	private $checkThisOnly;

public function __construct(bool $checkThisOnly)
	{
		$this->checkThisOnly = $checkThisOnly;
	}

public function getNodeType(): string
	{
		return \PhpParser\Node\Expr::class;
	}

/**
	 * @param \PhpParser\Node\Expr $node
	 * @param \PHPStan\Analyser\Scope $scope
	 * @return string[]
	 */
	public function processNode(\PhpParser\Node $node, \PHPStan\Analyser\Scope $scope): array
	{
		if (
			!$node instanceof \PhpParser\Node\Expr\PreInc
			&& !$node instanceof \PhpParser\Node\Expr\PostInc
			&& !$node instanceof \PhpParser\Node\Expr\PreDec
			&& !$node instanceof \PhpParser\Node\Expr\PostDec
		) {
			return [];
		}

$operatorString = $node instanceof \PhpParser\Node\Expr\PreInc || $node instanceof \PhpParser\Node\Expr\PostInc ? '++' : '--';

if (
			!$node->var instanceof \PhpParser\Node\Expr\Variable
			&& !$node->var instanceof \PhpParser\Node\Expr\ArrayDimFetch
			&& !$node->var instanceof \PhpParser\Node\Expr\PropertyFetch
			&& !$node->var instanceof \PhpParser\Node\Expr\StaticPropertyFetch
		) {
			return [
				sprintf(
					'Cannot use %s on a non-variable.',
					$operatorString
				),
			];
		}

if (!$this->checkThisOnly) {
			$varType = $scope->getType($node->var);
			if (!$varType->toString() instanceof ErrorType) {
				return [];
			}
			if (!$varType->toNumber() instanceof ErrorType) {
				return [];
			}

return [
				sprintf(
					'Cannot use %s on %s.',
					$operatorString,
					$varType->describe(VerbosityLevel::value())
				),
			];
		}

return [];
	}

}