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Error Identifiers: isset.*

There are 5 error identifiers in the isset.* group:

• isset.expr
  Expression in isset() is never null, making the check redundant.
• isset.initializedProperty
  Property in isset() is always initialized and non-null.
• isset.offset
  Array offset in isset() always exists or never exists.
• isset.property
  Property in isset() always exists and is never null.
• isset.variable
  Variable in isset() is never defined in the current scope.