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PHP Manual Language Reference Basic syntax Types Variables Constants Expressions Operators Control Structures Functions Classes and Objects Namespaces Enumerations Error Handling Fibers Generators Attributes References Explained Predefined Variables Predefined Exceptions Predefined Interfaces and Classes Predefined Attributes Context options and parameters Supported Protocols and Wrappers   OOP Changelog Overview Language Reference Last updated: Mon, 26 Oct 2026 Namespaces Table of Contents Overview Namespaces Sub-namespaces Defining multiple namespaces in the same file Basics Namespaces and dynamic language features namespace keyword and __NAMESPACE__ Aliasing and Importing Global space Fallback to global space Name resolution rules FAQ OOP Changelog Overview Language Reference Last updated: Mon, 26 Oct 2026

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