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Evaluates and returns all feature variables for the specified feature flag.

This method takes into account the user `attributes` passed in, to determine if the user is part of the audience that qualifies for the experiment.

### Sample call

## Version

SDK v3.4 and higher

## Description

For each feature variable associated with the feature flag, Get All Feature Variables returns all feature variable keys. For each key, it returns either the default or the user-specific variable value, depending on which audience the user is bucketed into. For example:

  • If the user is in a "Beta" audience on a feature rollout, this method returns user-specific values: `{"welcome_snippet": "you're in our beta!", "new_feature_color": "red"}`.

  • If the user is in a feature tests's `control_variation` in which the feature is disabled, this method returns the default values: `{"welcome_snippet": "", "new_feature_color": "grey"}`.

Note that depending on the audience rules, this method can return a mix of default and user-specific variable values.


Unlike [Is Feature Enabled](🔗), the Get All Feature Variables method does not trigger an impression event. This means that if you are running a feature test, events will not be counted until you call Is Feature Enabled. If you do not call Is Feature Enabled, you will not see any visitors on your results page.

## Parameters

Required and optional parameters are listed below.

**featureFlagKey** _required_stringThe feature key is defined from the Features dashboard.
**userId** _required_stringThe user ID string uniquely identifies the participant in the experiment. For more information, see: [Handle user IDs](🔗).
**attributes** _required_mapA map of custom key-value string pairs specifying attributes for the user that are used for [audience targeting](🔗) and [results segmentation](🔗). Non-string values are only supported in the 3.0 SDK and above.

## Returns

Returns a dictionary of feature variable keys and values. None if feature key is invalid.

For example:

## Example

## See also

[Get Feature Variable](🔗)

## Side effects

Invokes the `DECISION` [notification listener](🔗) if this listener is enabled. Sends only one notification for all variables.

## Source files

The language/platform source files containing the implementation for Php is [optimizely.php](🔗).