$city为二维数组
$cityid = array_column($city, 'newsid');//array_column提取二维数组中的元素值
$cityname = array_column($city, 'title');
$allid = array_merge($allid,array_column($city, 'newsid'));//累加数组
$allname = array_merge($allname,array_column($city, 'title'));
$all = array_combine($allid, $allname);//将$allid的元素值做为新数组的键值,$allname作为元素值
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