<?php $arr = [ 1 => [ 1 => 4, 5 => 7 ], 2 => [ 1 => 2, 5 => 5 ], 3 => [ 1 => 2, 5 => 5 ], 4 => [ 1 => 6, 5 => 9 ], 5 => [ 1 => 6, 5 => 8 ] ]; $sum = array_reduce($arr, function($carry, $item){ $carry += $item[5]; return $carry; }); echo $sum;
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