src/Fixer/ClassUsage/DateTimeImmutableFixer.php
protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $isInNamespace = false;
        $isImported = false; // e.g. use DateTime;

        for ($index = 0, $limit = $tokens->count(); $index < $limit; ++$index) {
            $token = $tokens[$index];

            if ($token->isGivenKind(T_NAMESPACE)) {
                $isInNamespace = true;

                continue;
            }

            if ($token->isGivenKind(T_USE) && $isInNamespace) {
                $nextIndex = $tokens->getNextMeaningfulToken($index);
                if ('datetime' !== strtolower($tokens[$nextIndex]->getContent())) {
                    continue;
                }
                $nextNextIndex = $tokens->getNextMeaningfulToken($nextIndex);
                if ($tokens[$nextNextIndex]->equals(';')) {
                    $isImported = true;
                }

                $index = $nextNextIndex;

                continue;
            }

            if (!$token->isGivenKind(T_STRING)) {
                continue;
            }

            $lowercaseContent = strtolower($token->getContent());

            if ('datetime' === $lowercaseContent) {
                $this->fixClassUsage($tokens, $index, $isInNamespace, $isImported);
                $limit = $tokens->count(); // update limit, as fixing class usage may insert new token
            } elseif ('date_create' === $lowercaseContent) {
                $this->fixFunctionUsage($tokens, $index, 'date_create_immutable');
            } elseif ('date_create_from_format' === $lowercaseContent) {
                $this->fixFunctionUsage($tokens, $index, 'date_create_immutable_from_format');
            }
        }
    }
protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $isInNamespace = false;
        $isImported = false; // e.g. use DateTime;

        for ($index = 0, $limit = $tokens->count(); $index < $limit; ++$index) {
            $token = $tokens[$index];

            if ($token->isGivenKind(T_NAMESPACE)) {
                $isInNamespace = true;

                continue;
            }

            if ($token->isGivenKind(T_USE) && $isInNamespace) {
                $nextIndex = $tokens->getNextMeaningfulToken($index);
                if ('datetime' !== strtolower($tokens[$nextIndex]->getContent())) {
                    continue;
                }
                $nextNextIndex = $tokens->getNextMeaningfulToken($nextIndex);
                if ($tokens[$nextNextIndex]->equals(';')) {
                    $isImported = true;
                }

                $index = $nextNextIndex;

                continue;
            }

            if (!$token->isGivenKind(T_STRING)) {
                continue;
            }

            $lowercaseContent = strtolower($token->getContent());

            if ('datetime' === $lowercaseContent) {
                $this->fixClassUsage($tokens, $index, $isInNamespace, $isImported);
                $limit = $tokens->count(); // update limit, as fixing class usage may insert new token
            } elseif ('date_create' === $lowercaseContent) {
                $this->fixFunctionUsage($tokens, $index, 'date_create_immutable');
            } elseif ('date_create_from_format' === $lowercaseContent) {
                $this->fixFunctionUsage($tokens, $index, 'date_create_immutable_from_format');
            }
        }
    }
{@inheritdoc}