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String

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>types
>string
split_utf8
substr
html_escape

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Primary string type used throughout UCE.

`String` is an alias for `std::string`.

It is used for request data, headers, cookie values, file contents, query strings, JSON text, and WebSocket payloads.

Because it is backed by `std::string`, it is binary-safe and may also contain raw bytes.

For UTF-8-aware splitting, use helpers such as `split_utf8()` instead of assuming one byte equals one character.

## Related Concepts

- PHP: native PHP strings with helpers such as `substr()`, `trim()`, `explode()`, and `implode()`
- JavaScript / Node.js: JavaScript `string` values with methods such as `slice()`, `trim()`, `split()`, and `join()`
