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If you have a non-library SendGrid issue, please contact our [support team](https://support.sendgrid.com).

If you can't find a solution below, please open an [issue](https://github.com/sendgrid/sendgrid-php/issues).


## Table of Contents

* [Migrating from v2 to v3](#migrating)
* [Continue Using v2](#v2)
* [Testing v3 /mail/send Calls Directly](#testing)
* [Error Messages](#error)
* [Versions](#versions)
* [Environment Variables and Your SendGrid API Key](#environment)
* [Using the Package Manager](#package-manager)

<a name="migrating"></a>
## Migrating from v2 to v3

Please review [our guide](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/how_to_migrate_from_v2_to_v3_mail_send.html) on how to migrate from v2 to v3.

<a name="v2"></a>
## Continue Using v2

[Here](https://github.com/sendgrid/sendgrid-php/tree/75970eb82f5629e66db4d6da08ff7ef0c507e9b0) is the last working version with v2 support.

Using composer:

```json
{
  "require": {
    "sendgrid/sendgrid": "~3.2"
  }
}
```

Download packaged zip [here](https://sendgrid-open-source.s3.amazonaws.com/sendgrid-php/versions/sendgrid-php-75970eb.zip).

<a name="testing"></a>
## Testing v3 /mail/send Calls Directly

[Here](https://sendgrid.com/docs/Classroom/Send/v3_Mail_Send/curl_examples.html) are some cURL examples for common use cases.

<a name="error"></a>
## Error Messages

To read the error message returned by SendGrid's API:

```php
try {
    $response = $sendgrid->client->mail()->send()->post($mail);
} catch (Exception $e) {
    echo 'Caught exception: ',  $e->getMessage(), "\n";
}
```

<a name="versions"></a>
## Versions

We follow the MAJOR.MINOR.PATCH versioning scheme as described by [SemVer.org](http://semver.org). Therefore, we recommend that you always pin (or vendor) the particular version you are working with to your code and never auto-update to the latest version. Especially when there is a MAJOR point release, since that is guarenteed to be a breaking change. Changes are documented in the [CHANGELOG](https://github.com/sendgrid/sendgrid-php/blob/master/CHANGELOG.md) and [releases](https://github.com/sendgrid/sendgrid-php/releases) section.

<a name="environment"></a>
## Environment Variables and Your SendGrid API Key

All of our examples assume you are using [environment variables](https://github.com/sendgrid/sendgrid-php#setup-environment-variables) to hold your SendGrid API key.

If you choose to add your SendGrid API key directly (not recommended):

`$apiKey = getenv('SENDGRID_API_KEY');`

becomes

`$apiKey = 'SENDGRID_API_KEY';`

In the first case SENDGRID_API_KEY is in reference to the name of the environment variable, while the second case references the actual SendGrid API Key.

<a name="package-manager"></a>
## Using the Package Manager

We upload this library to [Packagist](https://packagist.org/packages/sendgrid/sendgrid) whenever we make a release. This allows you to use [composer](https://getcomposer.org) for easy installation.

In most cases we recommend you download the latest version of the library, but if you need a different version, please use:

```json
{
  "require": {
    "sendgrid/sendgrid": "~X.X.X"
  }
}
```