<?php $array = [ [4, 3, 5, 7, 210], [4, 9, 5, 7, 210], [4, 9, 25, 7, 210], ]; var_export( array_map( function($row) { $row[array_key_last($row)] = array_product(array_slice($row, 0, -1)); return $row; }, $array ) );
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