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This article provides an in-depth exploration of various methods for storing arrays in PHP constants, including using the const keyword for array constants, define() function support in PHP 7+, serialization storage solutions, and advanced features of class constants. Through detailed code examples and version comparisons, it analyzes the advantages, disadvantages, and applicable scenarios of different solutions, helping developers choose the most suitable implementation based on PHP version and project requirements.

This article provides an in-depth exploration of the core differences between assign/extend and merge methods in the Lodash library. Through detailed code examples and principle analysis, it reveals the fundamental distinction that assign/extend perform shallow property copying while merge executes deep recursive merging. The article also analyzes the handling differences for undefined and null values, special behaviors with array objects, and practical application scenarios and considerations for these methods in real-world development.