You can pass variable to function by reference, so that function could modify its arguments. The syntax is as follows:
Following things can be passed by reference:
Variable, i.e. foo($a)
New statement, i.e. foo(new foobar())
Reference, returned from a function, i.e.:returning by reference.
Any other expression should not be passed by reference, as the result is undefined. For example, the following examples of passing by reference are invalid:
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