Assign a variable reference to another variable

  $MyVariableA = "abc"
  $MyVariableB = &$MyVariableA;  //Store a reference (pointer) to MyVariableA

  $MyVariableB .= "def";
  echo $MyVariableA; //Outputs "abcdef"
  echo $MyVariableB; //Outputs "abcdef"

Array references

Works just the same as for variables.