From: kraghuba at in dot ibm dot com
Operating system: Linux, windows
PHP version: 5.2CVS-2007-12-11 (snap)
PHP Bug Type: Arrays related
Bug description: array_merge_recursive() doesn't behave as expected with
duplicate NULL values
Description:
------------
When two arrays having common key and value are passed as argument to
array_merge_recursive(), the function behaves in an unexpected way for NULL
values. It outputs an empty array instead of an array having two elements,
both being NULL. Whereas, the function behaves in an expected way with
values other than NULL. This behavior can be observed in the testcase
array_merge_recursive_variation9.phpt.
This behavior is observed in PHP5.3 and PHP6 as well.
I tried creating an array with two null values and it works:
<?php
$a = array(NULL, NULL);
var_dump($a);
?>
output:
array(2) {
[0]=>
NULL
[1]=>
NULL
}
Reproduce code:
---------------
<?php
$a1 = array( 'b' => 'string' );
$a2 = array( 'b' => 'string' );
$a3 = array( 'b' => NULL );
$a4 = array( 'b' => NULL );
var_dump( array_merge_recursive($a1, $a2) ); // expected output
var_dump( array_merge_recursive($a3, $a4) ); // unexpecteed output
?>
Expected result:
----------------
array(1) {
["b"]=>
array(2) {
[0]=>
string(6) "string"
[1]=>
string(6) "string"
}
}
array(1) {
["b"]=>
array(2) {
[0]=>
NULL
[1]=>
NULL
}
}
Actual result:
--------------
array(1) {
["b"]=>
array(2) {
[0]=>
string(6) "string"
[1]=>
string(6) "string"
}
}
array(1) {
["b"]=>
array(0) {
}
}
--
Edit bug report at http://bugs.php.net/?id=43559&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=43559&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=43559&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=43559&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=43559&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=43559&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=43559&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=43559&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=43559&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=43559&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=43559&r=support
Expected behavior: http://bugs.php.net/fix.php?id=43559&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=43559&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=43559&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=43559&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=43559&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=43559&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=43559&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=43559&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=43559&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=43559&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=43559&r=mysqlcfg
