如何将多维数组值推入单个数组

Here i am having one multidimensional array , using this array i have to merge the single array, i have tried in my point of view i have to use three foreach loop and then i have to push on one array,but my concern is if i am using foreach loop means my performance it will reduce,any one update my code with out for each loop or simplfied codeHere i am having one multidimensional array , u