PHP getValue usage

Hi @all
Hope everybody is fine
Happy new next actual year

Question
I can use

$editor->Field('FieldName')->setValue($ValueToSet);

But how to get an editor field value, for example in preCreate php event ?
I did lot of unsuccessfull try but nowhere succès...
I hope to get value like :

$ValueToGet = $editor->Field('FieldName')->getValue();

Some idea ?

Thanks and be safe