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PHP development basics - Strings

Chapter1 Preparation
1-1 Summary of string output methods
Chapter2 Common string functions (Part 1)
2-1 String filtering and filling
2-2 Case conversion and usage scenario analysis
2-3 Parsing and restoring HTML tags and special characters
Chapter3 Common string functions (Part 2)
3-1 Commonly used string search functions
3-2 Classic string replacement operation skills
3-3 Introduction to common operation functions of URL and JSON

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