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When you assign an object to a variable: $var = new Class; Netbeans will show a warning 'Variable does not seem to be used in its scope' when accessing a property (and that being the only use of the variable): $var->property; However it will not output that $var has not been defined.
experimental hint
reassigning to default owner
batch reassigning
Batch reassigning.
*** This bug has been marked as a duplicate of bug 170541 ***