foreach-array_slice.php

<?php

$offset = 0;
$length = 0;

$data = array(
	'1',
	'2',
	'3',
	'4',
	'5',
	'6',
);

$offset += $length;
$length  = 3;

foreach ( array_slice( $data, $offset, $length ) as $item ) {
	echo $item, '<br />';
}

$offset += $length;
$length  = 2;

foreach ( array_slice( $data, $offset, $length ) as $item ) {
	echo $item, '<br />';
}

$offset += $length;
$length  = 1;

foreach ( array_slice( $data, $offset, $length ) as $item ) {
	echo $item, '<br />';
}

$offset += $length;
$length  = null;

foreach ( array_slice( $data, $offset, $length ) as $item ) {
	echo $item, '<br />';
}

reset-next.php

<?php

$data = array(
	'1',
	'2',
	'3',
	'4',
	'5',
	'6',
);

$item = reset( $data );

foreach ( range( 1, 2 ) as $i ) {
	echo $item, '<br />';

	$item = next( $data );
}

foreach ( range( 1, 3 ) as $i ) {
	echo $item, '<br />';

	$item = next( $data );
}

echo $item, '<br />';

$item = next( $data );