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[2011-01-14 17:58 UTC] tuhin dot barua at gmail dot com
Description:
------------
example 1:
php > $a = new stdclass();
php > $a->arr = array(1,2,3);
php > $arr = 'arr';
php > print_r($a->$arr);
Array
(
[0] => 1
[1] => 2
[2] => 3
)
php > print_r($a->$arr[0]);
php >
example 2:
php > $arr = array(1,2,3);
php > $a = 'arr';
php > print_r($$a);
Array
(
[0] => 1
[1] => 2
[2] => 3
)
php > print_r($$a[0]);
arr
php > print_r($$a[1]);
php >
Test script:
---------------
$a = new stdclass();
$a->arr = array(1,2,3);
$arr = 'arr';
print_r($a->$arr);
print_r($a->$arr[0])
Expected result:
----------------
cant access array elements with a dynamic variable name.
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Last updated: Fri Feb 06 17:00:02 2026 UTC |
This is a simple operator associativity issue: $a->$arr[0] is actually parsed as $a->{$arr[0]}, and since the first character of $arr is "a", the last line in the test script ends up effectively being print_r($a->a). You can work around this by changing the last line of the script to: print_r($a->{$arr}[0]);ok. but how about this one ? lets say this is the object FacebookApiException Object ( [result:private] => Array ( [error] => Array ( [type] => OAuthException [message] => Invalid OAuth access token. ) ) [message:protected] => Invalid OAuth access token. ) how do i access field something like 'message:protected' ? $field = 'message:protected'; $object->$field // dont work in this case neither does $object->{$field} is that a bug? this kinda problem i faced with google data api as well... google has some field name like dc:date ... and i had to change it to dc_date before i can access it.