What are the differences between PHP constants and variables?

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☛ There is no need to write a dollar sign ($) before a constant, where as in Variable one has to write a dollar sign.
☛ Constants cannot be defined by simple assignment, they may only be defined using the define() function.
☛ Constants may be defined and accessed anywhere without regard to variable scoping rules.
☛ Once the Constants have been set, may not be redefined or undefined.
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