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<?php $json = '{"lenght":0,"subcategory":[]}'; $last_id = 123; $obj = json_decode($json, true); array_push($obj["subcategory"], $last_id); $obj["lenght"] = (int)$obj["lenght"] + 1; $json = json_encode($obj); echo $json;
Output for git.master, git.master_jit, rfc.property-hooks
{"lenght":1,"subcategory":[123]}

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