note 53411 added to function.array
| From: | matthiasDELETETHIS at ansorgs dot de | Date: | Tue, 31 May 2005 21:52:11 +0000 |
| Subject: | note 53411 added to function.array | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-89706@lists.php.net to get a copy of this message | ||
How to use array() to create an array of references rather than of copies? (Especially needed when
dealing with objects.) I played around somewhat and found a solution: place & before the
parameters of array() that shall be references. My PHP version is 4.3.10.
Demonstration:
<?php
$ref1 = 'unchanged';
$ref2 = & $ref1;
$array_of_copies = array($ref1, $ref2);
print_r($array_of_copies); // prints: Array ( [0] => unchanged [1] => unchanged )
$array_of_copies[0] = 'changed'; // $ref1 = 'changed'; is not equivalent, as it
was _copied_ to the array
print_r($array_of_copies); // prints: Array ( [0] => changed [1] => unchanged )
$array_of_refs = array(& $ref1, & $ref2); // the difference: place & before arguments
print_r($array_of_refs); // prints: Array ( [0] => unchanged [1] => unchanged )
$array_of_refs[0] = 'changed'; // $ref1 = 'changed'; is equivalent as
$array_of_refs[0] references $ref1
print_r($array_of_refs, true); // prints: Array ( [0] => changed [1] => changed )
?>
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