+### Interpolation
+
+Interpolation allows configuration values to be injected into a string with tokens. The tokens are used as keys that are looked up in the config object; the resulting configuration values will be used to replace the tokens in the provided string.
+
+For example, using the same configuration file shown above:
+```
+$result = $config->interpolate('The value is: {{a.b.c}}')
+```
+In this example, the `$result` string would be:
+```
+The value is: foo
+```
+