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<?php $first = ['Catalog No.:', 'H-B No.']; $second = [['GG', 692],['VV', 693]]; array_walk_recursive ( $second, fn(&$v, $i) => $v = "{$first[$i]} $v" ); var_export($second);
Output for git.master_jit, git.master
array ( 0 => array ( 0 => 'Catalog No.: GG', 1 => 'H-B No. 692', ), 1 => array ( 0 => 'Catalog No.: VV', 1 => 'H-B No. 693', ), )

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