php and json Creating default object from empty value

Dear Experts,
when I use it like below code php for json, it gives me the error although it works.

$dosyaadi="something";
$myObj->dosya = $dosyaadi;
$myObj->url = "www.mydomain.com/$dosyaadi";

$myJSON = json_encode($myObj);

echo $myJSON;

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it writes the Json but it gives the below code? Json works. But it gives error code

Error:
Warning: Creating default object from empty value in /home/nkolaydeponet/public_html/film-yeni-json-yedek2.php on line 118
LVL 1
BRMarketingAsked:
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Chris StanyonWebDevCommented:
You're creating your $myObj object implicitly. You should create it explicitly before using it:

$dosyaadi="something";
$myObj = new stdClass();
$myObj->dosya = $dosyaadi;
$myObj->url = "www.mydomain.com/$dosyaadi";

$myJSON = json_encode($myObj);

echo $myJSON;

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BRMarketingAuthor Commented:
Dear Chris

thank you so much.
Chris StanyonWebDevCommented:
No worries :)
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