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Core PHP Programming, Third Edition by Leon Atkinson

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Chapter 12. Encoding and Decoding

Topics in This Chapter

The functions for transforming text can be put into three general categories: functions that make arbitrary changes to strings, functions that transform strings according to special rules, and functions that evaluate strings and return a number or a boolean. Among the transformative functions are functions for encrypting text and compressing text. Among the evaluative functions are those for checking spelling, creating hashes, and pattern matching.

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