¿javascript como codificar decodificar?

[JXJ]

hola

ando con un codigo que me encontre en javascript

pero no se como se llama la forma en que lo codificaron. y como decodificarlo
en javascript es texto pues es un script y el navegador web lo lee.
parce hexadecimal

¿alguien sabe como convertirlo a texto y de texto a esta presentacion.?

gracias

Código PHP:


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