[PHP] & before function name

[Rodney Green]

In the code below what does the & (ampersand) at the beginning of the
function name do?

Code from ADODB library--------------------------------------

function &ADONewConnection($db='')
 {
 GLOBAL $ADODB_Database;

  $rez = true;
  if ($db) {
   if ($ADODB_Database != $db) ADOLoadCode($db);
  } else {
   if (!empty($ADODB_Database)) {
    ADOLoadCode($ADODB_Database);
   } else {
     $rez = false;
   }
  }


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