<?php $array = [ [0 => 1, 1 => 5, 3 => null], [0 => 4, 1 => null, 3 => null], [0 => null, 1 => 5, 3 => 5] ]; $result = []; array_walk_recursive( $array, function($v, $k) use(&$result) { $result[$k] = ($result[$k] ?? 0) + ($v !== null); } ); var_export($result);
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