Hard for me to grasp the need to do something like what you are proposing, if it were me I wouldn t populate an array using your structure, I would create an array like this:

array
  0 => 
    array
       pic  => string  740  (length=3)
       alt  => string    (length=0)
  1 => 
    array
       pic  => string  741  (length=3)
       alt  => string    (length=0)
  2 => 
    array
       pic  => string  742  (length=3)
       alt  => string  Test Caption 1  (length=0)
  3 => 
    array
       pic  => string  748  (length=3)
       alt  => string  Test Caption 2  (length=0)

This array structure keeps the image attributes together, rather than keeping them separate.

tomtheman5 has 80% there, but left out the offset, and length params to the array_slice calls that need to be passed to get the correct slices. However he does make a good point, if you stick with your array structure, you may run into issues if you do not have matching elements in each pic and alt arrays. If this is not a concern, then consider the following snippet:

$slice1 = array();
$slice2 = array();    

foreach ($array as $key => $value) {

    $arrayCount = count($array[$key]);
    $arrayHalfCount = ($arrayCount / 2);

    $slice1[$key] = array_slice($array[$key], 0, $arrayHalfCount);
    $slice2[$key] = array_slice($array[$key], $arrayHalfCount);
}

--——————

$lodgepics = get_field( accommodation_rooms );
$featuredpics = get_field( featured_pics );
$showcasepics = array();
foreach ($featuredpics as $featuredpic) {
    if ((isset($featuredpic[ featured_pic ])) && (!empty($featuredpic[ featured_pic ]))) {
        $currentPic[ pic ] = $featuredpic[ featured_pic ];
        $currentPic[ alt ] = (isset($featuredpic[ featured_alt ])) ? $featuredpic[ featured_alt ] :   ; 
        $showcasepics[] = $currentPic;
}
}

foreach ($lodgepics as $lodgepic) {
    if ((isset($lodgepic[ accommodation_roomphoto ])) && (!empty($lodgepic[ accommodation_roomphoto ]))) {
        $currentPic[ pic ] = $lodgepic[ accommodation_roomphoto ];    
        $currentPic[ alt ] = (isset($lodgepic[ accommodation_roomname ])) ? $lodgepic[ accommodation_roomname ] :   ;
        $showcasepics[] = $currentPic;
}
}

$showcasepicsCount = count($showcasepics);
$showcasepicsHalfCount = ($showcasepicsCount / 2);

$slice1 = array_slice($showcasepics, 0, $showcasepicsHalfCount);
$slice2 = array_slice($showcasepics, $showcasepicsHalfCount);

这些是实际阵列。 主要的阵列是一个联系阵列,因此,为了获得你的许可,你需要穿透阵列的所有钥匙:

$slice1 = array();
$slice2 = array();
foreach ($array as $key => $value)
{
    $slice1[$key] = array_slice($array[$key], ...);
    $slice2[$key] = array_slice($array[$key], ...);
}

阵列——把一个阵列铺到丘库

$array1 = array("1" => "green", "2" => "brown", "3" => "blue", "4" => "black");
$array2 = array("5" => "yellow","6" => "orange","7"=> "violet","8"=> "white");

$arraylength1   = ceil(count($array1)/2);
$res1           = array_chunk($array1,$arraylength1);
$arraylength2   = ceil(count($array2)/2);
$res2           = array_chunk($array2,$arraylength2);

echo "<pre>";
print_r($res1);
print_r($res2);
echo "</pre>";
exit;

Try This.