Serialisation, or serialization, is a process that takes in a piece of data and generates a storable or transportable representation of the data. The serialised representation of data can be achieved with various formats.
What's unique about serialisation in PHP is that it actually uses a special serialisation format to represent various types of data, including arrays and objects. Each data type that PHP can serialise has it's own representation and notation when serialised.
The User object has 2 properties, so the name for each property is serialised as a string and the serialised value comes after.
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