in src/main/java/lt/martynassateika/idea/codeigniter/config/ConfigFileIndex.java [138:145]
private boolean isConfigArrayAccess(ArrayAccessExpression expression) {
PsiElement firstChild = expression.getFirstChild();
if (firstChild instanceof Variable) {
Variable variable = (Variable) firstChild;
return variable.getName().equals("config");
}
return false;
}