Php variables must be prefixed by $ This allows php to perform string interpolation in double quoted strings, where backslash is supported as an escape character. For the associative array, the format is <serialised key> <serialised value>, repeated for each association/pair in the array. This is a comparison of data serialization formats, various ways to convert complex objects to sequences of bits It does not include markup languages used exclusively as document file formats.
A string is often implemented as an array data structure of bytes (or words) that stores a sequence of elements, typically characters, using some character encoding More general, string may also denote a sequence (or list) of data other than just characters. This comparison of programming languages (array) compares the features of array data structures or matrix processing for various computer programming languages.
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