"The history of namespaces in PHP is quite a winding
road. They were originally going to be a part of PHP V5, but they
were removed in the development stages since proper implementation
could not be achieved. It finally came back to life as a part of
PHP V6, then moved to PHP V5.3 after the decision to move all of
the nonunicode enhancements to another PHP V5.x release was made in
2007. While much of the behavior of namespaces has been constant
since the original design, the issue of which operator to use was
the biggest one, with polarizing views on what it should be from
all members of the community. A final decision to use the backslash
as the operator was made in October 2008, solving all the issues
that using various other operators presented in terms of language
design and usability."
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