Charset conversion

The CharsetConverter class converts your CSV records using the mbstring extension and its supported character encodings.


public CharsetConverter::inputEncoding(string $input_encoding): self
public CharsetConverter::outputEncoding(string $output_encoding): self

The inputEncoding and outputEncoding methods set the object encoding properties. By default, the input encoding and the output encoding are set to UTF-8.

When building a CharsetConverter object, the methods do not need to be called in any particular order, and may be called multiple times. Because the CharsetConverter is immutable, each time its setter methods are called they return a new object without modifying the current one.

If the submitted charset is not supported by the mbstring extension an OutOfRangeException will be thrown.


public CharsetConverter::convert(iterable $records): iterable

CharsetConverter::convert converts the collection of records according to the encoding settings.

use League\Csv\CharsetConverter;

$csv = new SplFileObject('/path/to/french.csv', 'r');
$csv->setFlags(SplFileObject::READ_CSV | SplFileObject::SKIP_EMPTY);

$encoder = (new CharsetConverter())->inputEncoding('iso-8859-15');
$records = $encoder->convert($csv);

The resulting data is converted from iso-8859-15 to the default UTF-8 since no output encoding charset was set using the CharsertConverter::outputEncoding method.

CharsetConverter as a Writer formatter

public CharsetConverter::__invoke(array $record): array

Using the CharsetConverter::__invoke method, you can register a CharsetConverter object as a record formatter using the Writer::addFormatter method.

use League\Csv\CharsetConverter;
use League\Csv\Writer;

$encoder = (new CharsetConverter())

$writer = Writer::createFromPath('/path/to/your/csv/file.csv');

$writer->insertOne(["foo", "bébé", "jouet"]);
//all 'utf-8' characters are now automatically encoded into 'iso-8859-15' charset

CharsetConverter as a PHP stream filter

public static CharsetConverter::addTo(AbstractCsv $csv, string $input_encoding, string $output_encoding): AbstractCsv
public static CharsetConverter::register(): void
public static CharsetConverter::getFiltername(string $input_encoding, string $output_encoding): string

Usage with CSV objects

If your CSV object supports PHP stream filters then you can use the CharsetConverter class as a PHP stream filter using the library stream filtering mechanism instead.

The CharsetConverter::addTo static method:

use League\Csv\CharsetConverter;
use League\Csv\Writer;

$writer = Writer::createFromPath('/path/to/your/csv/file.csv');
CharsetConverter::addTo($writer, 'utf8', 'iso-8859-15');

$writer->insertOne(["foo", "bébé", "jouet"]);
//all 'utf-8' characters are now automatically encoded into 'iso-8859-15' charset

Usage with PHP stream resources

To use this stream filter outside League\Csv objects you need to:

use League\Csv\CharsetConverter;


$resource = fopen('/path/to/my/file', 'r');
$filter = stream_filter_append(
    CharsetConverter::getFiltername('utf-8', 'iso-8859-15'),

while (false !== ($record = fgetcsv($resource))) {
    //$record is correctly encoded

If your system supports the iconv extension you should use PHP's built in iconv stream filters instead for better performance.