関連ワード:  php append to 2d array    php append to multidimensional array    php add to 2d array    php add to multidimensional array    php add to multidimensional array with key    php add item to multidimensional array    php add row to multidimensional array    php add column to multidimensional array    php add value to multidimensional array    php add data to multidimensional array