note 61300 added to language.references.arent
| From: | jagatpreet at osu1 dot php dot net | Date: | Mon, 30 Jan 2006 19:27:21 +0000 |
| Subject: | note 61300 added to language.references.arent | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-102745@lists.php.net to get a copy of this message | ||
In response to the example by mdiricks.
Extending the example given by mdiricks, the following code provides an explains the concept of
re-referencing that is involved in making a call to function foo with the prototype foo(& var):
<!-- C re-referenced -->
<?
$a = 'eh';
$b = & $a;// $b == 'eh'
$c = & $b;// $c == 'eh'
$d = 'meh';
echo "\$a = $a\n";
echo "\$b = $b\n";
echo "\$c = $c\n";
echo "\$d = $d\n";
$c = & $d ;// $c == 'meh'
echo "\n";
echo "\$a = $a\n";
echo "\$b = $b\n";
echo "\$c = $c\n";
echo "\$d = $d\n";
?>
<!-- Value of c changed -->
<?
$a = 'eh';
$b = & $a;// $b == 'eh'
$c = & $b;// $c == 'eh'
$d = 'meh';
echo "\$a = $a\n";
echo "\$b = $b\n";
echo "\$c = $c\n";
echo "\$d = $d\n";
$c = 'meh' ;// $c == 'meh'. And also, $a = $b == 'meh'
echo "\n";
echo "\$a = $a\n";
echo "\$b = $b\n";
echo "\$c = $c\n";
echo "\$d = $d\n";
?>
This results in the following o/p:
<!-- C re-referenced -->
$a = eh
$b = eh
$c = eh
$d = meh
$a = eh
$b = eh
$c = meh
$d = meh
<!-- Value of c changed -->
$a = eh
$b = eh
$c = eh
$d = meh
$a = meh
$b = meh
$c = meh
$d = meh
----
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Probable Submitter: 166.32.192.163
----
Manual Page -- http://www.php.net/manual/en/language.references.arent.php
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