src/Fixer/Basic/NonPrintableCharacterFixer.php
protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $replacements = [];
        $escapeSequences = [];
        foreach ($this->symbolsReplace as $character => list($replacement, $codepoint)) {
            $replacements[$character] = $replacement;
            $escapeSequences[$character] = '\u{'.$codepoint.'}';
        }

        foreach ($tokens as $index => $token) {
            $content = $token->getContent();

            if (
                $this->configuration['use_escape_sequences_in_strings']
                && $token->isGivenKind([T_CONSTANT_ENCAPSED_STRING, T_ENCAPSED_AND_WHITESPACE])
            ) {
                if (!Preg::match('/'.implode('|', array_keys($escapeSequences)).'/', $content)) {
                    continue;
                }

                $previousToken = $tokens[$index - 1];
                $stringTypeChanged = false;

                if ($previousToken->isGivenKind(T_START_HEREDOC)) {
                    $previousTokenContent = $previousToken->getContent();

                    if (false !== strpos($previousTokenContent, '\'')) {
                        $tokens[$index - 1] = new Token([T_START_HEREDOC, str_replace('\'', '', $previousTokenContent)]);
                        $stringTypeChanged = true;
                    }
                } elseif ("'" === $content[0]) {
                    $content = Preg::replace('/^\'(.*)\'$/', '"$1"', $content);
                    $stringTypeChanged = true;
                }

                if ($stringTypeChanged) {
                    $content = Preg::replace('/([\\\\$])/', '\\\\$1', $content);
                }

                $tokens[$index] = new Token([$token->getId(), strtr($content, $escapeSequences)]);

                continue;
            }

            if ($token->isGivenKind(self::$tokens)) {
                $tokens[$index] = new Token([$token->getId(), strtr($content, $replacements)]);
            }
        }
    }
protected function applyFix(\SplFileInfo $file, Tokens $tokens)
    {
        $replacements = [];
        $escapeSequences = [];
        foreach ($this->symbolsReplace as $character => list($replacement, $codepoint)) {
            $replacements[$character] = $replacement;
            $escapeSequences[$character] = '\u{'.$codepoint.'}';
        }

        foreach ($tokens as $index => $token) {
            $content = $token->getContent();

            if (
                $this->configuration['use_escape_sequences_in_strings']
                && $token->isGivenKind([T_CONSTANT_ENCAPSED_STRING, T_ENCAPSED_AND_WHITESPACE])
            ) {
                if (!Preg::match('/'.implode('|', array_keys($escapeSequences)).'/', $content)) {
                    continue;
                }

                $previousToken = $tokens[$index - 1];
                $stringTypeChanged = false;

                if ($previousToken->isGivenKind(T_START_HEREDOC)) {
                    $previousTokenContent = $previousToken->getContent();

                    if (false !== strpos($previousTokenContent, '\'')) {
                        $tokens[$index - 1] = new Token([T_START_HEREDOC, str_replace('\'', '', $previousTokenContent)]);
                        $stringTypeChanged = true;
                    }
                } elseif ("'" === $content[0]) {
                    $content = Preg::replace('/^\'(.*)\'$/', '"$1"', $content);
                    $stringTypeChanged = true;
                }

                if ($stringTypeChanged) {
                    $content = Preg::replace('/([\\\\$])/', '\\\\$1', $content);
                }

                $tokens[$index] = new Token([$token->getId(), strtr($content, $escapeSequences)]);

                continue;
            }

            if ($token->isGivenKind(self::$tokens)) {
                $tokens[$index] = new Token([$token->getId(), strtr($content, $replacements)]);
            }
        }
    }
{@inheritdoc}