From: RQuadling at GMail dot com
Operating system: Windows XP SP2
PHP version: Irrelevant
PHP Bug Type: Documentation problem
Bug description: json_decode has limits on array depth.
Description:
------------
Massively nested arrays are decoded as null by json_decode.
Admittedly, an array this deep has its own concerns, but with no warnings
or notices, documentation of the limit would be advisable.
The following code has 2 arrays, the first is 18 levels, the second is 19.
The first decodes correctly, the second decodes as null.
Whilst an array MAY not be this deep, it is possible that objects
containing objects with arrays COULD produce a depth of 19 levels. Sure,
not exactly LEAN, but that's why this is just a minor doc issue and not a
more important code issue.
The issue is with json_decode as json_encode quite happily encodes the
larger array - an inconsistency maybe as the json_decode dox does say any
json_encode'd output (though I am awaiting the changes due to bug#38680).
It also makes no difference if you use the 'assoc' option (json_decode's
second paramater of True) to produce an associative array. The limit is
still reached at 19 levels.
Reproduce code:
---------------
<?php
$a_array =
array('One' => array('Two' => array('Three' => array('Four' =>
array('Five' => array('Six' => array('Seven' => array('Eight' =>
array('Nine' => array('Ten' => array('Eleven' => array('Twelve' =>
array('Thirteen' => array('Fourteen' => array('Fifteen' =>
array('Sixteen' => array('Seventeen' => array('Eighteen' =>
array(1,2,3)))))))))))))))))));
var_dump(json_encode($a_array));
var_dump(json_decode(json_encode($a_array)));
$a_array =
array('One' => array('Two' => array('Three' => array('Four' =>
array('Five' => array('Six' => array('Seven' => array('Eight' =>
array('Nine' => array('Ten' => array('Eleven' => array('Twelve' =>
array('Thirteen' => array('Fourteen' => array('Fifteen' =>
array('Sixteen' => array('Seventeen' => array('Eighteen' =>
array('Nineteen' => array(1,2,3))))))))))))))))))));
var_dump(json_encode($a_array));
var_dump(json_decode(json_encode($a_array)));
?>
Expected result:
----------------
string(195)
"{"One":{"Two":{"Three":{"Four":{"Five":{"Six":{"Seven":{"Eight":{"Nine":{"Ten":{"Eleven":{"Twelve":{"Thirteen":{"Fourteen":{"Fifteen":{"Sixteen":{"Seventeen":{"Eighteen":[1,2,3]}}}}}}}}}}}}}}}}}}"
object(stdClass)#1 (1) {
["One"]=>
object(stdClass)#2 (1) {
["Two"]=>
object(stdClass)#3 (1) {
["Three"]=>
object(stdClass)#4 (1) {
["Four"]=>
object(stdClass)#5 (1) {
["Five"]=>
object(stdClass)#6 (1) {
["Six"]=>
object(stdClass)#7 (1) {
["Seven"]=>
object(stdClass)#8 (1) {
["Eight"]=>
object(stdClass)#9 (1) {
["Nine"]=>
object(stdClass)#10 (1) {
["Ten"]=>
object(stdClass)#11 (1) {
["Eleven"]=>
object(stdClass)#12 (1) {
["Twelve"]=>
object(stdClass)#13 (1) {
["Thirteen"]=>
object(stdClass)#14 (1) {
["Fourteen"]=>
object(stdClass)#15 (1) {
["Fifteen"]=>
object(stdClass)#16 (1) {
["Sixteen"]=>
object(stdClass)#17 (1) {
["Seventeen"]=>
object(stdClass)#18 (1) {
["Eighteen"]=>
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
string(208)
"{"One":{"Two":{"Three":{"Four":{"Five":{"Six":{"Seven":{"Eight":{"Nine":{"Ten":{"Eleven":{"Twelve":{"Thirteen":{"Fourteen":{"Fifteen":{"Sixteen":{"Seventeen":{"Eighteen":{"Nineteen":[1,2,3]}}}}}}}}}}}}}}}}}}}"
object(stdClass)#1 (1) {
["One"]=>
object(stdClass)#2 (1) {
["Two"]=>
object(stdClass)#3 (1) {
["Three"]=>
object(stdClass)#4 (1) {
["Four"]=>
object(stdClass)#5 (1) {
["Five"]=>
object(stdClass)#6 (1) {
["Six"]=>
object(stdClass)#7 (1) {
["Seven"]=>
object(stdClass)#8 (1) {
["Eight"]=>
object(stdClass)#9 (1) {
["Nine"]=>
object(stdClass)#10 (1) {
["Ten"]=>
object(stdClass)#11 (1) {
["Eleven"]=>
object(stdClass)#12 (1) {
["Twelve"]=>
object(stdClass)#13 (1) {
["Thirteen"]=>
object(stdClass)#14 (1) {
["Fourteen"]=>
object(stdClass)#15 (1) {
["Fifteen"]=>
object(stdClass)#16 (1) {
["Sixteen"]=>
object(stdClass)#17 (1) {
["Seventeen"]=>
object(stdClass)#18 (1) {
["Eighteen"]=>
object(stdClass)#19 (1) {
["Nineteen"] =>
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
Actual result:
--------------
string(195)
"{"One":{"Two":{"Three":{"Four":{"Five":{"Six":{"Seven":{"Eight":{"Nine":{"Ten":{"Eleven":{"Twelve":{"Thirteen":{"Fourteen":{"Fifteen":{"Sixteen":{"Seventeen":{"Eighteen":[1,2,3]}}}}}}}}}}}}}}}}}}"
object(stdClass)#1 (1) {
["One"]=>
object(stdClass)#2 (1) {
["Two"]=>
object(stdClass)#3 (1) {
["Three"]=>
object(stdClass)#4 (1) {
["Four"]=>
object(stdClass)#5 (1) {
["Five"]=>
object(stdClass)#6 (1) {
["Six"]=>
object(stdClass)#7 (1) {
["Seven"]=>
object(stdClass)#8 (1) {
["Eight"]=>
object(stdClass)#9 (1) {
["Nine"]=>
object(stdClass)#10 (1) {
["Ten"]=>
object(stdClass)#11 (1) {
["Eleven"]=>
object(stdClass)#12 (1) {
["Twelve"]=>
object(stdClass)#13 (1) {
["Thirteen"]=>
object(stdClass)#14 (1) {
["Fourteen"]=>
object(stdClass)#15 (1) {
["Fifteen"]=>
object(stdClass)#16 (1) {
["Sixteen"]=>
object(stdClass)#17 (1) {
["Seventeen"]=>
object(stdClass)#18 (1) {
["Eighteen"]=>
array(3) {
[0]=>
int(1)
[1]=>
int(2)
[2]=>
int(3)
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
}
string(208)
"{"One":{"Two":{"Three":{"Four":{"Five":{"Six":{"Seven":{"Eight":{"Nine":{"Ten":{"Eleven":{"Twelve":{"Thirteen":{"Fourteen":{"Fifteen":{"Sixteen":{"Seventeen":{"Eighteen":{"Nineteen":[1,2,3]}}}}}}}}}}}}}}}}}}}"
NULL
--
Edit bug report at http://bugs.php.net/?id=38945&edit=1
--
Try a CVS snapshot (PHP 4.4):
http://bugs.php.net/fix.php?id=38945&r=trysnapshot44
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=38945&r=trysnapshot52
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=38945&r=trysnapshot60
Fixed in CVS: http://bugs.php.net/fix.php?id=38945&r=fixedcvs
Fixed in release:
http://bugs.php.net/fix.php?id=38945&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=38945&r=needtrace
Need Reproduce Script: http://bugs.php.net/fix.php?id=38945&r=needscript
Try newer version: http://bugs.php.net/fix.php?id=38945&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=38945&r=support
Expected behavior: http://bugs.php.net/fix.php?id=38945&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=38945&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=38945&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=38945&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=38945&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=38945&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=38945&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=38945&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=38945&r=float
No Zend Extensions: http://bugs.php.net/fix.php?id=38945&r=nozend
MySQL Configuration Error: http://bugs.php.net/fix.php?id=38945&r=mysqlcfg
