# Migration to v4.X

This guide assists developers in migrating from Flagship 3.X to Flagship 4.X.

The primary changes include:

* Visitor Creation
* Flagship configuration
* Flagship SDK Status

For more details, see the [change log](https://github.com/flagship-io/flagship-ts-sdk/releases)

## Visitor Creation

In version 4.X, the [VisitorBuild](/server-side/sdks/php/php-reference.md#visitorbuilder-class) api has been updated to be more descriptive.

Below is an example of how consent is used in versions 4.X and 3.X

{% tabs %}
{% tab title="Now" %}

```php
$visitor = Flagship::newVisitor("visitorId", true)
  ->setIsAuthenticated(true)
  ->setContext(["age" => 31, "isVip" => true])
  ->build()
```

{% endtab %}

{% tab title="Before" %}

```php
$visitor = Flagship::newVisitor("visitorId", true)
  ->isAuthenticated(true)
  ->withContext(["age" => 31, "isVip" => true])
  ->build()
```

{% endtab %}
{% endtabs %}

## Flagship configuration

In version 4.X, the `setStatusChangedCallback`setter of [FlagshipConfig](/server-side/sdks/php/php-reference.md#flagshipconfig-class) has been replaced with [`setOnSdkStatusChanged`](/server-side/sdks/php/php-reference.md#setonsdkstatuschanged-accessor).

## Flagship SDK Status

The `FlagshipStatus` class has been superseded by [`FSSdkStatus`](/server-side/sdks/php/php-reference.md#getstatus-method).

The table below matches the `FlagshipStatus` enum keys from version 3.X to the corresponding [`FSSdkStatus`](/server-side/sdks/php/php-reference.md#getstatus-method) keys in version 4.X.

| V4.X                  | V3.X             |
| --------------------- | ---------------- |
| SDK\_NOT\_INITIALIZED | NOT\_READY       |
| SDK\_NOT\_INITIALIZED | NOT\_INITIALIZED |
| SDK\_INITIALIZING     | STARTING         |
| SDK\_INITIALIZING     | POLLING          |
| SDK\_PANIC            | READY\_PANIC\_ON |
| SDK\_INITIALIZED      | READY            |

\\

## `GetFlag` method update

In version 4.X, the approach to setting a flag's default value has been modified. The default value is no longer set using the [getFlag](/server-side/sdks/php/php-reference.md#getflag-method) method of visitor instance. Instead, it is now set using the [getValue](/server-side/sdks/php/php-reference.md#getvalue-method) of [flag](/server-side/sdks/php/php-reference.md#getflag-method) instance.

Here's how you can retrieve the default value of a flag in versions 4.X and 3.X:

{% tabs %}
{% tab title="Now" %}

```php

...

$flag = $visitor->getFlag("myFlagKey");
$flagValue = $flag->getValue("default-value");
```

{% endtab %}

{% tab title="Before" %}

```php

...

$flag = $visitor->getFlag("myFlagKey", "default-value");
$flagValue = $flag->getValue();
```

{% endtab %}
{% endtabs %}


---

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