note 95841 added to language.references.whatare
| From: | zhangjyr at hotmail dot com | Date: | Mon, 25 Jan 2010 10:41:10 +0000 |
| Subject: | note 95841 added to language.references.whatare | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-165268@lists.php.net to get a copy of this message | ||
I actually write a test to approve what you can do with reference. Note that when you assign a
variable with an object, you don't change reference at all.
function & return_by_ref(&$out, $type) {
switch ($type) {
case 0:
$var = array("d"=>5);
$out = $var;
$var['d'] = 3;
return $var; // out? yes, out !== var
case 1:
$var = array("d"=>5);
$out = &$var;
$var['d'] = 3;
return $var; // out? no, out !== var
case 2:
$var = new stdClass();
$var->d = 5;
$out = $var;
$var->d = 3;
return $var; // out? yes, out === var
case 3:
$var = new stdClass();
$var->d = 5;
$out = &$var;
$var->d = 3;
return $var; // out? no, out !== var
default:
$out = new stdClass();
return $out; // out? yes, out === var
}
}
foreach
(array("array","array_reassign","obj","obj_reassign") as
$key => $name) {
$out = null;
$var = & $this->return_by_ref($out, $key);
echo "$name test:</br>";
echo "Is out evaluated:". var_export(isset($out), true) . "</br>";
echo "Is var and out identical:". var_export($var === $out, true) .
"</br>";
unset($out);
unset($var);
----
Server IP: 69.147.83.197
Probable Submitter: 210.5.147.188
----
Manual Page -- http://www.php.net/manual/en/language.references.whatare.php
Edit -- https://master.php.net/note/edit/95841
Del: integrated -- https://master.php.net/note/delete/95841/integrated
Del: useless -- https://master.php.net/note/delete/95841/useless
Del: bad code -- https://master.php.net/note/delete/95841/bad+code
Del: spam -- https://master.php.net/note/delete/95841/spam
Del: non-english -- https://master.php.net/note/delete/95841/non-english
Del: in docs -- https://master.php.net/note/delete/95841/in+docs
Del: other reasons-- https://master.php.net/note/delete/95841
Reject -- https://master.php.net/note/reject/95841
Search -- https://master.php.net/manage/user-notes.php