Aşağıdaki kodlar çalışmadı sebebi ne olabilir.
$postDescription = "\u0645\u0646 \u0627\u062c\u0645\u0644 \u0648\u0627\u0641\u0636\u0644 \u0627\u0644\u0641\u0646\u0627\u062f\u0642 \u0641\u064a #\u0627\u0646\u062a\u0631\u0644\u0627\u0643\u0646 \u0627\u0637\u0644\u0627\u0644\u0647 \u0648\u0645\u0643\u0627\u0646 \u0648\u0647\u062f\u0648\u0621 \u0648\u062e\u0635\u0648\u0635\u064a\u0647 \u0641\u0646\u062f\u0642 \u0628\u0631\u064a\u0646\u0632\u0631\u0633\u064a \u0639\u0644\u0649 \u0628\u062d\u064a\u0631\u0629 \u0628\u0631\u064a\u0646\u0632\n\u0633\u0648\u064a \u0633\u0631\u0627#\n\u0645\u0646\u0634\u0646 \u0644\u0634\u062e\u0635 \u062a\u062d\u0628 \u0648\u062c\u0648\u062f\u0647 \u0645\u0639\u0627\u0643";
echo json_decode($postDescription);
Kodları bu adresten tarayıcı üzerinden test edebilirsiniz:
http://sandbox.onlinephpfunctions.com/code/a7b155a0501476a1c4be677c032365b1b6149c2d