PHP references allow you to make two variables to refer to the
same content. Meaning, when you do:
it means that
$a and
$b
point to the same variable.
Note:
$a and $b are completely
equal here, that's not $a is pointing to
$b or vice versa, that's
$a and $b pointing to the
same place.
The second thing references do is to pass variables
by-reference. This is done by making local function variable and
caller variable to be reference to the same content. Example:
will make
$a to be 6. This happens because in
the function
foo the variable
$var refers to the same content as
$a.
The third thing reference can do is return by-reference.
