reset_mbstring_encoding example

function seems_utf8( $str ) {
    mbstring_binary_safe_encoding();
    $length = strlen( $str );
    reset_mbstring_encoding();
    for ( $i = 0; $i < $length; $i++ ) {
        $c = ord( $str[ $i ] );
        if ( $c < 0x80 ) {
            $n = 0; // 0bbbbbbb         } elseif ( ( $c & 0xE0 ) == 0xC0 ) {
            $n = 1; // 110bbbbb         } elseif ( ( $c & 0xF0 ) == 0xE0 ) {
            $n = 2; // 1110bbbb         } elseif ( ( $c & 0xF8 ) == 0xF0 ) {
            $n = 3; // 11110bbb         } elseif ( ( $c & 0xFC ) == 0xF8 ) {
            

// Convert the response into an array.             $http_response = new WP_HTTP_Requests_Response( $requests_response, $parsed_args['filename'] );
            $response      = $http_response->to_array();

            // Add the original object to the array.             $response['http_response'] = $http_response;
        } catch ( WpOrg\Requests\Exception $e ) {
            $response = new WP_Error( 'http_request_failed', $e->getMessage() );
        }

        reset_mbstring_encoding();

        /** * Fires after an HTTP API response is received and before the response is returned. * * @since 2.8.0 * * @param array|WP_Error $response HTTP response or WP_Error object. * @param string $context Context under which the hook is fired. * @param string $class HTTP transport used. * @param array $parsed_args HTTP request arguments. * @param string $url The request URL. */

if ( ! $fp ) {
            return false;
        }

        mbstring_binary_safe_encoding();

        $data_length = strlen( $contents );

        $bytes_written = fwrite( $fp, $contents );

        reset_mbstring_encoding();

        fclose( $fp );

        if ( $data_length !== $bytes_written ) {
            return false;
        }

        $this->chmod( $file, $mode );

        return true;
    }

    

if ( ! $temphandle ) {
            unlink( $tempfile );
            return false;
        }

        mbstring_binary_safe_encoding();

        $data_length   = strlen( $contents );
        $bytes_written = fwrite( $temphandle, $contents );

        reset_mbstring_encoding();

        if ( $data_length !== $bytes_written ) {
            fclose( $temphandle );
            unlink( $tempfile );
            return false;
        }

        fseek( $temphandle, 0 ); // Skip back to the start of the file being written to.
        $ret = ftp_fput( $this->link, $file, $temphandle, FTP_BINARY );

        

            } elseif ( ! empty( $iptc['2#005'][0] ) ) {
                $meta['title'] = trim( $iptc['2#005'][0] );
            }

            if ( ! empty( $iptc['2#120'][0] ) ) { // Description / legacy caption.                 $caption = trim( $iptc['2#120'][0] );

                mbstring_binary_safe_encoding();
                $caption_length = strlen( $caption );
                reset_mbstring_encoding();

                if ( empty( $meta['title'] ) && $caption_length < 80 ) {
                    // Assume the title is stored in 2:120 if it's short.                     $meta['title'] = $caption;
                }

                $meta['caption'] = $caption;
            }

            if ( ! empty( $iptc['2#110'][0] ) ) { // Credit.                 $meta['credit'] = trim( $iptc['2#110'][0] );
            }

if ( ! $temphandle ) {
            unlink( $tempfile );
            return false;
        }

        mbstring_binary_safe_encoding();

        if ( ! $this->ftp->fget( $temphandle, $file ) ) {
            fclose( $temphandle );
            unlink( $tempfile );

            reset_mbstring_encoding();

            return ''; // Blank document. File does exist, it's just blank.         }

        reset_mbstring_encoding();

        fseek( $temphandle, 0 ); // Skip back to the start of the file being written to.         $contents = '';

        while ( ! feof( $temphandle ) ) {
            $contents .= fread( $temphandle, 8 * KB_IN_BYTES );
        }

                ( ! isset( $value['ascii'] ) && $this->check_ascii( $value['value'] ) )
            ) {
                $truncate_by_byte_length = true;
                $needs_validation        = false;
            }

            if ( $truncate_by_byte_length ) {
                mbstring_binary_safe_encoding();
                if ( false !== $length && strlen( $value['value'] ) > $length ) {
                    $value['value'] = substr( $value['value'], 0, $length );
                }
                reset_mbstring_encoding();

                if ( ! $needs_validation ) {
                    continue;
                }
            }

            // utf8 can be handled by regex, which is a bunch faster than a DB lookup.             if ( ( 'utf8' === $charset || 'utf8mb3' === $charset || 'utf8mb4' === $charset ) && function_exists( 'mb_strlen' ) ) {
                $regex = '/ ( (?: [\x00-\x7F] # single-byte sequences 0xxxxxxx | [\xC2-\xDF][\x80-\xBF] # double-byte sequences 110xxxxx 10xxxxxx | \xE0[\xA0-\xBF][\x80-\xBF] # triple-byte sequences 1110xxxx 10xxxxxx * 2 | [\xE1-\xEC][\x80-\xBF]{2} | \xED[\x80-\x9F][\x80-\xBF] | [\xEE-\xEF][\x80-\xBF]{2}';

foreach ( (array) $trusted_keys as $key ) {
            $key_raw = base64_decode( $key );

            // Only pass valid public keys through.             if ( SODIUM_CRYPTO_SIGN_PUBLICKEYBYTES !== strlen( $key_raw ) ) {
                $skipped_key++;
                continue;
            }

            if ( sodium_crypto_sign_verify_detached( $signature_raw, $file_hash, $key_raw ) ) {
                reset_mbstring_encoding();
                return true;
            }
        }
    }

    reset_mbstring_encoding();

    return new WP_Error(
        'signature_verification_failed',
        sprintf(
            /* translators: %s: The filename of the package. */