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.:
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:
function bar() // Note the missing { $a = 5; return $a; } foo(bar()); foo($a = 5) // Expression, not variable foo(5) // Constant, not variable |