I have a JSON file like that:
{
"product": "www.example.com",
"enabled": true,
...
}
After using file_get_contents() and json_decode($string,FALSE) I got a classic stdClass Object with properties. Var_dump() returns the following output :
object(stdClass)#2 (7) {
["product"] => string(15) "www.example.com"
["enabled"] => bool(true)
...
}
Then, things get weird.
In 99% of cases, $myobject->product returns the string "www.example.com". That is what you expected, right?
But sometimes (in average: 2 times per minute on our production servers), $myobject->product returns NULL. I can't explain that.
I've added some debugs before and after that line, this is what I get when the wrong behaviour occurs:
var_dump($myobject) : gives the output given before
print_r($myobject) : OK
var_export($myobject) : OK
is_object($myobject) : TRUE
isset($myobject->product) : TRUE
is_string($myobject->product) : FALSE !!!
gettype($myobject->product) : NULL !!!
get_object_vars($myobject) : Array('product'=>'www.example.com', 'enabled'=>true, ...)
get_class_methods($myobject) : Array()
ReflectionClass::export($myobject) : Class [ <internal:Core> class stdClass ] (0 constant, 0 property, 0 method, ...)
I run the PHP code through Apache. I get no Apache error, no PHP error, nothing. It's simply the property returning null when I try to access it, but it's obviously present when I dump the variable object just before and after the code.
phpinfo())Can you help me? I'm stuck with this problem, because it's hard to reproduce (randomly), and because it's completely illogical.
Thanks in advance!
PS : I can't give exact files and code, due to the policy of my company, but I'd be happy to answer to all your questions.
UPDATE with a PHP code you can test:
<?php
// Show me all errors
ini_set("display_errors",1);
error_reporting(-1);
// Initialize the object
$object = json_decode('{"product": "www.example.com"}', false);
echo "\n *** DUMP *** \n";
var_dump($object);
echo "\n Product : ";
echo $object->product;
echo "\n Is the variable an object ? ".(is_object($object) ? "Yes" : "No");
echo "\n Is the property set ? ".(isset($object->product) ? "Yes" : "No");
echo "\n Is the property a string ? ".(is_string($object->product) ? "Yes" : "No");
echo "\n Is the property null ? ".(is_null($object->product) ? "Yes" : "No");
echo "\n END";
Expected result, that I got for 98/100 of the Apache requests
HTTP/1.1 200 OK
Date: Thu, 23 Jan 2014 17:18:37 GMT
Server: Apache/2.2.14 (Ubuntu)
X-Powered-By: PHP/5.3.2-1ubuntu4.14
Vary: Accept-Encoding
Content-Length: 241
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/html
Accept-Ranges: none
*** DUMP ***
object(stdClass)#1 (1) {
["product"]=>
string(15) "www.example.com"
}
Product : www.example.com
Is the variable an object ? Yes
Is the property set ? Yes
Is the property a string ? Yes
Is the property null ? No
END
Buggy result I got too...
HTTP/1.1 200 OK
Date: Thu, 23 Jan 2014 17:18:37 GMT
Server: Apache/2.2.14 (Ubuntu)
X-Powered-By: PHP/5.3.2-1ubuntu4.14
Vary: Accept-Encoding
Content-Length: 580
Keep-Alive: timeout=15, max=100
Connection: Keep-Alive
Content-Type: text/html
Accept-Ranges: none
*** DUMP ***
object(stdClass)#1 (1) {
["product"]=>
string(15) "www.example.com"
}
Product :
Notice: Trying to get property of non-object in /var/[...]/test_object.php on line 12
Is the variable an object ? Yes
Is the property set ? Yes
Notice: Trying to get property of non-object in /var/[...]/test_object.php on line 15
Is the property a string ? No
Notice: Trying to get property of non-object in /var/[...]test_object.php on line 16
Is the property null ? Yes
END
Upgrading to PHP 5.3.10 (shipped with Ubuntu 12.04) fixed the PHP bug.