Official PHP client library for the DeepL API.
The DeepL API is a language translation API that allows other computer programs to send texts and documents to DeepL's servers and receive high-quality translations. This opens a whole universe of opportunities for developers: any translation product you can imagine can now be built on top of DeepL's best-in-class translation technology.
The DeepL PHP library offers a convenient way for applications written for PHP to interact with the DeepL API. We intend to support all API functions with the library, though support for new features may be added to the library after they’re added to the API.
To use deepl-php, you'll need an API authentication key. To get a key, please create an account here. With a DeepL API Free account you can translate up to 500,000 characters/month for free.
To use this library in your project, install it using Composer:
composer require deeplcom/deepl-phpThe library officially supports PHP 7.3 and later.
Starting in 2024, we will drop support for older PHP versions that have reached official end-of-life. You can find the PHP versions and support timelines here. To continue using this library, you should update to PHP 8.1+.
Construct a Translator object. The first argument is a string containing your
API authentication key as found in your DeepL Pro Account.
Be careful not to expose your key, for example when sharing source code.
$authKey = "f63c02c5-f056-..."; // Replace with your key
$translator = new \DeepL\Translator($authKey);
$result = $translator->translateText('Hello, world!', null, 'fr');
echo $result->text; // Bonjour, le monde!Translator accepts options as the second argument, see
Configuration for more information.
To translate text, call translateText(). The first argument is a string
containing the text you want to translate, or an array of strings if you want to
translate multiple texts.
The second and third arguments are the source and target language codes.
Language codes are case-insensitive strings according to ISO 639-1, for
example 'de', 'fr', 'ja''. Some target languages also include the regional
variant according to ISO 3166-1, for example 'en-US', or 'pt-BR'. The source
language also accepts null, to enable auto-detection of the source language.
The last argument to translateText() is optional, and specifies extra
translation options, see Text translation options
below.
translateText() returns a TextResult, or an array of TextResults
corresponding to your input text(s). TextResult has two properties: text is
the translated text, and detectedSourceLang is the detected source language
code.
// Translate text into a target language, in this case, French:
$translationResult = $translator->translateText('Hello, world!', 'en', 'fr');
echo $translationResult->text; // 'Bonjour, le monde !'
// Translate multiple texts into British English:
$translations = $translator->translateText(
['お元気ですか？', '¿Cómo estás?'],
null,
'en-GB',
);
echo $translations[0]->text; // 'How are you?'
echo $translations[0]->detectedSourceLang; // 'ja'
echo $translations[1]->text; // 'How are you?'
echo $translations[1]->detectedSourceLang; // 'es'
// Translate into German with less and more Formality:
echo $translator->translateText('How are you?', null, 'de', ['formality' => 'less']); // 'Wie geht es dir?'
echo $translator->translateText('How are you?', null, 'de', ['formality' => 'more']); // 'Wie geht es Ihnen?'Provide options to the translateText function as an associative array,
using the following keys:
split_sentences: specify how input text should be split into sentences, default:'on'.'on': input text will be split into sentences using both newlines and punctuation.'off': input text will not be split into sentences. Use this for applications where each input text contains only one sentence.'nonewlines': input text will be split into sentences using punctuation but not newlines.
preserve_formatting: controls automatic-formatting-correction. Set totrueto prevent automatic-correction of formatting, default:false.formality: controls whether translations should lean toward informal or formal language. This option is only available for some target languages, see Listing available languages. Use theprefer_*options to apply formality if it is available for the target language, or otherwise fallback to the default.'less': use informal language.'more': use formal, more polite language.'default': use default formality.'prefer_less': use informal language if available, otherwise default.'prefer_more': use formal, more polite language if available, otherwise default.
tag_handling: type of tags to parse before translation, options are'html'and'xml'.context: specifies additional context to influence translations, that is not translated itself. Note this is an alpha feature: it may be deprecated at any time, or incur charges if it becomes generally available. See the API documentation for more information and example usage.glossary: glossary ID of glossary to use for translation.
The following options are only used if tag_handling is 'xml':
outline_detection: specifyfalseto disable automatic tag detection, default istrue.splitting_tags: list of XML tags that should be used to split text into sentences. Tags may be specified as an array of strings (['tag1', 'tag2']), or a comma-separated list of strings ('tag1,tag2'). The default is an empty list.non_splitting_tags: list of XML tags that should not be used to split text into sentences. Format and default are the same as forsplitting_tags.ignore_tags: list of XML tags that containing content that should not be translated. Format and default are the same as forsplitting_tags.
The TranslateTextOptions class defines constants for the options above, for
example TranslateTextOptions::FORMALITY is defined as 'formality'.
To translate documents, call translateDocument(). The first and second
arguments are the input and output file paths.
The third and fourth arguments are the source and target language codes, and
they work exactly the same as when translating text with translateText().
The last argument to translateDocument() is optional, and specifies extra
translation options, see
Document translation options below.
// Translate a formal document from English to German:
try {
$translator->translateDocument(
'Instruction Manual.docx',
'Bedienungsanleitung.docx',
'en',
'de',
['formality' => 'more'],
);
} catch (\DeepL\DocumentTranslationException $error) {
// If the error occurs after the document was already uploaded,
// documentHandle will contain the document ID and key
echo 'Error occurred while translating document: ' . ($error->getMessage() ?? 'unknown error');
if ($error->documentHandle) {
$handle = $error->documentHandle;
echo "Document ID: {$handle->documentId}, document key: {$handle->documentKey}";
} else {
echo 'Unknown document handle';
}
}translateDocument() wraps multiple API calls: uploading, polling status until
the translation is complete, and downloading. If your application needs to
execute these steps individually, you can instead use the following functions
directly:
uploadDocument(),getDocumentStatus()(orwaitUntilDocumentTranslationComplete()), anddownloadDocument()
Provide options to the translateDocument function as an associative array,
using the following keys:
formality: same as in Text translation options.glossary: same as in Text translation options.
The uploadDocument function also supports these options.
The TranslateDocumentOptions class defines constants for the options above,
for example TranslateDocumentOptions::FORMALITY is defined as 'formality'.
Glossaries allow you to customize your translations using user-defined terms. Multiple glossaries can be stored with your account, each with a user-specified name and a uniquely-assigned ID.
You can create a glossary with your desired terms and name using
createGlossary(). Each glossary applies to a single source-target language
pair. Note: Glossaries are only supported for some language pairs, see
Listing available glossary languages
for more information. The entries should be specified as a GlossaryEntries
object; you can create one using GlossaryEntries::fromEntries using an
associative array with the source terms as keys and the target terms as values.
Then use createGlossary() with the glossary name, source and target language
codes and the GlossaryEntries. If successful, the glossary is created and
stored with your DeepL account, and a GlossaryInfo object is returned
including the ID, name, languages and entry count.
// Create an English to German glossary with two terms:
$entries = GlossaryEntries::fromEntries(['artist' => 'Maler', 'prize' => 'Gewinn']);
$myGlossary = $translator->createGlossary('My glossary', 'en', 'de', $entries);
echo "Created '$myGlossary->name' ($myGlossary->glossaryId) " .
"$myGlossary->sourceLang to $myGlossary->targetLang " .
"containing $myGlossary->entryCount entries";
// Example: Created 'My glossary' (559192ed-8e23-...) en to de containing 2 entriesYou can also upload a glossary downloaded from the DeepL website using
createGlossaryFromCsv(). Similar to createGlossary, specify the glossary
name, and source and target language codes, but instead of specifying the terms
as an associative array, specify the CSV data as a string:
// Read CSV data from a file, for example: "artist,Maler,en,de\nprize,Gewinn,en,de"
$csvData = file_get_contents('/path/to/glossary_file.csv');
$myCsvGlossary = $translator->createGlossaryFromCsv(
'CSV glossary',
'en',
'de',
$csvData,
)The API documentation explains the expected CSV format in detail.
Functions to get, list, and delete stored glossaries are also provided:
getGlossary()takes a glossary ID and returns aGlossaryInfoobject for a stored glossary, or raises an exception if no such glossary is found.listGlossaries()returns a list ofGlossaryInfoobjects corresponding to all of your stored glossaries.deleteGlossary()takes a glossary ID orGlossaryInfoobject and deletes the stored glossary from the server, or raises an exception if no such glossary is found.
// Retrieve a stored glossary using the ID
$glossaryId = '559192ed-8e23-...';
$myGlossary = $translator->getGlossary($glossaryId);
// Find and delete glossaries named 'Old glossary'
$glossaries = $translator->listGlossaries();
foreach ($glossaries as $glossary) {
if ($glossary->name === 'Old glossary') {
$translator->deleteGlossary($glossary);
}
}The GlossaryInfo object does not contain the glossary entries, but instead
only the number of entries in the entryCount property.
To list the entries contained within a stored glossary, use
getGlossaryEntries() providing either the GlossaryInfo object or glossary
ID. A GlossaryEntries object is returned; you can access the entries as an
associative array using getEntries():
$entries = $translator->getGlossaryEntries($myGlossary);
print_r($entries->getEntries()); // Array ( [artist] => Maler, [prize] => Gewinn)You can use a stored glossary for text translation by setting the glossary
option to either the glossary ID or GlossaryInfo object. You must also
specify the sourceLang argument (it is required when using a glossary):
$text = 'The artist was awarded a prize.';
$withGlossary = $translator->translateText($text, 'en', 'de', ['glossary' => $myGlossary]);
echo $withGlossary->text; // "Der Maler wurde mit einem Gewinn ausgezeichnet."
// For comparison, the result without a glossary:
$withGlossary = $translator->translateText($text, null, 'de');
echo $withoutGlossary->text; // "Der Künstler wurde mit einem Preis ausgezeichnet."Using a stored glossary for document translation is the same: set the glossary
option. The sourceLang argument must also be specified:
$translator->translateDocument(
$inFile, $outFile, 'en', 'de', ['glossary' => $myGlossary]
)The translateDocument() and translateDocumentUpload() functions both
support the glossary argument.
To check account usage, use the getUsage() function.
The returned Usage object contains up to three usage subtypes, depending on
your account type: character, document and teamDocument. For API accounts
character will be set, the others null.
Each usage subtypes (if set) have count and limit properties giving the
amount used and maximum amount respectively, and the limitReached() function
that checks if the usage has reached the limit. The top level Usage object has
the anyLimitReached() function to check all usage subtypes.
$usage = $translator->getUsage();
if ($usage->anyLimitReached()) {
echo 'Translation limit exceeded.';
}
if ($usage->character) {
echo 'Characters: ' . $usage->character->count . ' of ' . $usage->character->limit;
}
if ($usage->document) {
echo 'Documents: ' . $usage->document->count . ' of ' . $usage->document->limit;
}You can request the list of languages supported by DeepL Translator for text and
documents using the getSourceLanguages() and getTargetLanguages() functions.
They both return an array of Language objects.
The name property gives the name of the language in English, and the code
property gives the language code. The supportsFormality property only appears
for target languages, and is a bool indicating whether the target language
supports the optional formality parameter.
$sourceLanguages = $translator->getSourceLanguages();
foreach ($sourceLanguages as $sourceLanguage) {
echo $sourceLanguage->name . ' (' . $sourceLanguage->code . ')'; // Example: 'English (en)'
}
$targetLanguages = $translator->getTargetLanguages();
foreach ($targetLanguages as $targetLanguage) {
if ($targetLanguage->supportsFormality) {
echo $targetLanguage->name . ' (' . $targetLanguage->code . ') supports formality';
// Example: 'German (de) supports formality'
}
}Glossaries are supported for a subset of language pairs. To retrieve those
languages use the getGlossaryLanguages() function, which returns an array
of GlossaryLanguagePair objects. Each has sourceLang and targetLang
properties indicating that that pair of language codes is supported.
$glossaryLanguages = $translator->getGlossaryLanguages();
foreach ($glossaryLanguages as $glossaryLanguage) {
echo "$glossaryLanguage->sourceLang to $glossaryLanguage->targetLang";
// Example: "en to de", "de to en", etc.
}You can also find the list of supported glossary language pairs in the API documentation.
Note that glossaries work for all target regional-variants: a glossary for the
target language English ('en') supports translations to both American English
('en-US') and British English ('en-GB').
If you use this library in an application, please identify the application with
the app_info TranslatorOption, which needs the name and version of the app:
$options = ['app_info' => new \DeepL\AppInfo('my-custom-php-chat-client', '1.2.3')];
$translator = new \DeepL\Translator('YOUR_AUTH_KEY', $options);This information is passed along when the library makes calls to the DeepL API.
Both name and version are required. Please note that setting the User-Agent header
via the headers TranslatorOption will override this setting, if you need to use this,
please manually identify your Application in the User-Agent header.
The Translator constructor accepts configuration options as a second argument,
for example:
$options = [ 'max_retries' => 5, 'timeout' => 10.0 ];
$translator = new \DeepL\Translator('YOUR_AUTH_KEY', $options);Provide the options as an associative array with the following keys:
max_retries: the maximum number of failed HTTP requests to retry, per function call. By default, 5 retries are made. See Request retries.timeout: the number of seconds used as connection timeout for each HTTP request retry. The default value is10.0(10 seconds).server_url:stringcontaining the URL of the DeepL API, can be overridden for example for testing purposes. By default, the URL is selected based on the user account type (free or paid).headers: extra HTTP headers attached to every HTTP request. By default, no extra headers are used. Note that Authorization and User-Agent headers are added automatically but may be overridden by this option.proxy: specify a proxy server URL.logger: specify aPSR-3compatible logger that the library should log messages to.
The TranslatorOptions class defines constants for the options above.
You can configure a proxy using the proxy option when constructing a
Translator:
$proxy = 'http://user:[email protected]:3128';
$translator = new \DeepL\Translator('YOUR_AUTH_KEY', ['proxy' => $proxy]);The proxy option is used for the CURLOPT_PROXY option when preparing the cURL
request, see the documentation for cURL.
To enable logging, specify a PSR-3 compatible logger as the
'logger' option in the Translator configuration options.
By default, we send some basic information about the platform the client library is running on with each request, see here for an explanation. This data is completely anonymous and only used to improve our product, not track any individual users. If you do not wish to send this data, you can opt-out when creating your Translator object by setting the send_platform_option flag in the options like so:
$translator = new \DeepL\Translator('YOUR_AUTH_KEY', ['send_platform_info' => false]);You can also customize the User-Agent header completely by setting its value explicitly in the options via the headers field (this overrides the send_platform_option option). For example::
$headers = [
'Authorization' => "DeepL-Auth-Key YOUR_AUTH_KEY",
'User-Agent' => 'my-custom-php-client',
];
$translator = new \DeepL\Translator('YOUR_AUTH_KEY', ['headers' => $headers]);If you want to set specific HTTP options that we don't expose (or otherwise want more control over the API calls by the library), you can configure the library to use a PSR-18 compliant HTTP client of your choosing. For example, in order to use a connect timeout of 5.2 seconds and read timeout of 7.4 seconds while using a proxy with Guzzle:
$client = new \GuzzleHttp\Client([
'connect_timeout' => 5.2,
'read_timeout' => 7.4,
'proxy' => 'http://localhost:8125'
]);
$translator = new \DeepL\Translator('YOUR_AUTH_KEY', [TranslatorOptions::HTTP_CLIENT => $client]);
$translator->getUsage(); // Or a translate call, etcRequests to the DeepL API that fail due to transient conditions (for example,
network timeouts or high server-load) will be retried. The maximum number of
retries can be configured when constructing the Translator object using the
max_retries option. The timeout for each request attempt may be controlled
using the timeout option. An exponential-backoff strategy is used, so
requests that fail multiple times will incur delays.
If you experience problems using the library, or would like to request a new feature, please open an issue.
We welcome Pull Requests, please read the contributing guidelines.
Execute the tests using phpunit. The tests communicate with the DeepL API
using the auth key defined by the DEEPL_AUTH_KEY environment variable.
Be aware that the tests make DeepL API requests that contribute toward your API usage.
The test suite may instead be configured to communicate with the mock-server
provided by deepl-mock. Although most test cases work for either,
some test cases work only with the DeepL API or the mock-server and will be
otherwise skipped. The test cases that require the mock-server trigger server
errors and test the client error-handling. To execute the tests using
deepl-mock, run it in another terminal while executing the tests. Execute the
tests using phpunit with the DEEPL_MOCK_SERVER_PORT and DEEPL_SERVER_URL
environment variables defined referring to the mock-server.
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