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This article provides an in-depth exploration of various methods for currency number formatting in PHP, ranging from basic number_format() function to complex internationalization solutions. It analyzes the advantages and limitations of each approach, including the simplicity of number_format(), the constraints of money_format(), and the modern internationalization support of the NumberFormatter class. Through practical code examples and comparative analysis, it offers guidance for developers to choose appropriate formatting strategies in different scenarios, with particular focus on multi-language currency display requirements.