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class Example
{
var $value = "some value";
function PrintValue()
{
print $this->value;
}
}
$obj = new Example();
$obj->PrintValue();
?>

function PrintValue($arr)
{
print $arr["value"];
}

function CreateExample()
{
$arr["value"] = "some value";
$arr["PrintValue"] = "PrintValue";

return $arr;
}

$arr = CreateExample();

//Use PHP's indirect reference
$arr["PrintValue"]($arr);
?>

$a = 5;

//$b points to the same place in memory as $a $b與$a指向內存中同個(gè)地址
$b = &$a;

//we're changing $b, since $a is pointing to 改變$b,指向的地址改變
//the same place - it changes too $a指向的地址也改變
$b = 7;

//prints 7 輸出7
print $a;
?>

1 class MyFoo {
2 function MyFoo()
3 {
4 $this->me = &$this;
5 $this->value = 5;
6 }
7
8 function setValue($val)
9 {
10 $this->value = $val;
11 }
12
13 function getValue()
14 {
15 return $this->value;
16 }
17
18 function getValueFromMe()
19 {
20 return $this->me->value;
21 }
22 }
23
24 function CreateObject($class_type)
25 {
26 switch ($class_type) {
27 case "foo":
28 $obj = new MyFoo();
29 break;
30 case "bar":
31 $obj = new MyBar();
32 break;
33 }
34 return $obj;
35 }
36
37 $global_obj = CreateObject ("foo");
38 $global_obj->setValue(7);
39
40 print "Value is " . $global_obj->getValue() . "n";
41 print "Value is " . $global_obj->getValueFromMe() . "n";

1 class MyFoo {
2 function MyFoo()
3 {
4 $this->me = &$this;
5 $this->value = 2;
6 }
7
8 function setValue($val)
9 {
10 $this->value = $val;
11 }
12
13 function getValue()
14 {
15 return $this->value;
16 }
17
18 function getValueFromMe()
19 {
20 return $this->me->value;
21 }
22 };
23
24 function &CreateObject($class_type)
25 {
26 switch ($class_type) {
27 case "foo":
28 $obj =& new MyFoo();
29 break;
30 case "bar":
31 $obj =& new MyBar();
32 break;
33 }
34 return $obj;
35 }
36
37 $global_obj =& CreateObject ("foo");
38 $global_obj->setValue(7);
39
40 print "Value is " . $global_obj->getValue() . "n";
41 print "Value is " . $global_obj->getValueFromMe() . "n";