从JSON（PHP）中删除项目

Question

I reviewed a lot of post to delete an item from JSON with PHP but somehow the 'unset' function is not working anywhere in my code. How can I delete 'SPEC_Info' from my JSON file with the code below I created to merge different JSON files (URLs)?

$sets = array();
foreach ($urls as $url)
{
    $json = file_get_contents($url);
    $data = json_decode($json);
    $json = substr($json, 1, -1);
    $sets = array_merge($sets, $data);
}

$new = json_encode($sets, JSON_PRETTY_PRINT);
echo '<pre>';
echo $new;

$fp = fopen('dsales_watchjewel_combined_en.json', 'w');
fwrite($fp, $new);
fclose($fp);

Answer 1

$sets = array();
foreach ($urls as $url)
{
    $json = file_get_contents($url);
    $decoded = json_decode($json, true);
    oreach ($decoded as $key => $innerObject) { //based on the fact that your JSON contains multiple inner objects.
        if(isset($innerObject['SPEC_Info'])) {
            unset($decoded[$key]['SPEC_Info']);
        }
    }
    $sets[] = $decoded;
}
$new = json_encode($sets, JSON_PRETTY_PRINT);
echo '<pre>';
echo $new;

$fp = fopen('combined.json', 'w');
fwrite($fp, $new);
close($fp);