我想迭代 JSON 的键:{ "rates": { "AED":4.089781, "AFN":85.578915, "ALL":121.871136 }}喜欢:key[0] = AEDkey[1] = AFN .... and so on..或者在 foreach 循环中我怎么做?
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$j = json_decode('{ "rates": { "AED":4.089781, "AFN":85.578915, "ALL":121.871136 }} ');foreach($j->rates as $key => $tmp) { echo $key . PHP_EOL;}# AED AFN ALL
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