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Possible Duplicate:
Reference – What does this symbol mean in PHP?
I have seen references to = (of course) but also .= and ^=. What are those two for? Are there others?
^=is a bitwise operator and.=is a string operator. Both are assignment operators, as they set the value of a variable after evaluating.The former sets the value of the variable to a XOR of the expression. The latter concats the expression onto the variable.