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Classes, visibility, traits, error modes, and common runtime behavior. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.
Foundations: syntax, variables, arrays, and basic language features. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.
Internals-oriented topics: lifecycle, OPCache, fibers, attributes, weak references, and security-minded patterns. Mix of single-answer and multiple-answer items; multi-select questions ask you to select every correct statement.
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