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<?php $array = [ [1, 2, 3], [4, 5, 6] ]; var_export( array_map( fn($row) => array_merge(['X'], $row), $array ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 0 => 'X', 1 => 1, 2 => 2, 3 => 3, ), 1 => array ( 0 => 'X', 1 => 4, 2 => 5, 3 => 6, ), )

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