<?php $arr = [ [ [4,4,6,8,7,4,3], [4,4,6,8,7,4,3], ], [ [4,4,6,8,7,4,3], [43,6,8,31,2,1], ], [4,5,6,8] ]; $sum = array_sum( iterator_to_array( new RecursiveIteratorIterator( new RecursiveArrayIterator($arr) ), false ) ); var_dump($sum);
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