How can I iterate through two arrays at the same time without re-iterating through the parent loop? [duplicate]

Answer 1

Not the most efficient, but a demonstration of SPL's multipleIterator

$mi = new MultipleIterator();
$mi->attachIterator(new ArrayIterator($a));
$mi->attachIterator(new ArrayIterator($b));

$newArray = array();
foreach ( $mi as $value ) {
    list($value1, $value2) = $value;
    echo $value1 , '-' , $value2 , PHP_EOL;
}