A string in PHP is a sequence of characters, represented as either single-quoted or double-quoted strings. PHP treats strings as arrays of bytes, where each character is a byte. It's important to note that PHP does not offer native Unicode support and supports a 256-character set.
A string is a sequence of characters. It is a data structure that represents a sequence of characters, either as a literal constant or as some kind of variable. In data structures and algorithms, strings are used in a wide range of applications such as text processing, pattern matching, and data serialization.