3v4l.org

run code in 300+ PHP versions simultaneously
<?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 ) );
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
array ( 0 => array ( 0 => 4, 1 => 3, 2 => 5, 3 => 7, 4 => 420, ), 1 => array ( 0 => 4, 1 => 9, 2 => 5, 3 => 7, 4 => 1260, ), 2 => array ( 0 => 4, 1 => 9, 2 => 25, 3 => 7, 4 => 6300, ), )
preferences:
75.72 ms | 402 KiB | 62 Q