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Separate words in a text field with a character in php

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i need to separate the characters in a variable for a field Specifically we use the function str_replace (). Is an example: We

variable $ title = "Title of"

and finally we want the words are separated by hyphens, ie $ result = "Degree-of-the-expression" .
The expression used is:

$ result = str_replace ("","-",$ title)