What does =& mean in PHP?

Question

Consider:

$smarty =& SESmarty::getInstance(); 

What is the & for?

Answer 1

It passes by reference. Meaning that it won't create a copy of the value passed.

See: http://php.net/manual/en/language.references.php (See Adam's Answer)

Usually, if you pass something like this:

$a = 5; $b = $a; $b = 3;  echo $a; // 5 echo $b; // 3 

The original variable ($a) won't be modified if you change the second variable ($b) . If you pass by reference:

$a = 5; $b =& $a; $b = 3;  echo $a; // 3 echo $b; // 3 

The original is changed as well.

Which is useless when passing around objects, because they will be passed by reference by default.