How do you combine two foreach loops into one

Question

The language is PHP. I have one foreach ( $a as $b) and another foreach ($c as $d => $e). How do i combine them to read as one. I tired foreach (($a as $b) && ($c as

Answer 1

1) First method

 $n) {
    echo $f.$n;
    echo "
";
}
?>

or 2) Second method

";
}
?>