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<?php $j = '{"4":"jo\u00e3o da silva"}'; var_dump(json_decode($j));
Output for 8.1.2 - 8.1.33, 8.2.10 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
object(stdClass)#1 (1) { ["4"]=> string(14) "joão da silva" }
preferences:
73.53 ms | 406 KiB | 5 Q