$jsonfile = file_get_contents("http://api.geonames.org/searchJSON?username=ksuhiyp&country=pt&maxRows=1000&style=SHORT");    $jsondata = json_encode($jsonfile);    $cities = explode(',', $jsondata);    foreach($cities as $key => $value){        echo $value;    }我怎樣才能只獲取數(shù)組中包含的所有城市名稱（例如......里斯本，波爾圖，阿威羅......）？這是數(shù)組的示例：{"totalResultsCount":37305,"geonames":[{"lng":"-9.13333","geonameId":2267057,"countryCode":"PT","name":"Lisbon","toponymName":"Lisbon","lat":"38.71667","fcl":"P","fcode":"PPLC"},{"lng":"-8.61099","geonameId":2735943,"countryCode":"PT","name":"Porto","toponymName":"Porto","lat":"41.14961","fcl":"P","fcode":"PPLA"},{"lng":"-8.42005","geonameId":2742032,"countryCode":"PT","name":"Braga","toponymName":"Braga","lat":"41.55032","fcl":"P","fcode":"PPLA"},{"lng":"-8.8882","geonameId":2262963,"countryCode":"PT","name":"Setúbal","toponymName":"Setúbal","lat":"38.5244","fcl":"P","fcode":"PPLA"},{"lng":"-8.13057","geonameId":2264397,"countryCode":"PT","name":"Portugal","toponymName":"Portuguese Republic","lat":"39.6945","fcl":"A","fcode":"PCLI"},