Php 无法分割数组-我需要将数组拆分为两半

我有一个数组，如下所示。我想把它切成两半，然后从两半中创建两个新数组。但是，如果我使用array_slice，它总是返回null。。。我不明白为什么

array
  'pic' => 
    array
      0 => string '740' (length=3)
      1 => string '741' (length=3)
      2 => string '742' (length=3)
      3 => string '748' (length=3)
  'alt' => 
    array
      0 => string '' (length=0)
      1 => string '' (length=0)
      2 => string 'Test caption 1' (length=14)
      3 => string 'Test caption 2' (length=14)

我需要的阵列应该保留键，只是切成两半，所以我有两个互补的两半。例如，前半部分应如下所示：

array
  'pic' => 
    array
      0 => string '740' (length=3)
      1 => string '741' (length=3)
  'alt' => 
    array
      0 => string '' (length=0)
      1 => string '' (length=0)

下半部分：

array
  'pic' => 
    array
      0 => string '742' (length=3)
      1 => string '748' (length=3)
  'alt' => 
    array
      0 => string 'Test caption 1' (length=14)
      1 => string 'Test caption 2' (length=14)

谢谢

ps-对Mike来说，这就是我用来制作数组的东西，实际上它是由其他数组本身构建的：

$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'])) $showcasepics[pic][] = $featuredpic['featured_pic'];
    if (isset($featuredpic['featured_alt'])) $showcasepics[alt][] = $featuredpic['featured_alt'];
else $showcasepics[alt][] = '';
}
foreach ($lodgepics as $lodgepic) {
    if(isset($lodgepic['accommodation_roomphoto'])&&!empty($lodgepic['accommodation_roomphoto'])) $showcasepics[pic][] = $lodgepic['accommodation_roomphoto'];
    if(isset($lodgepic['accommodation_roomname'])&&!empty($lodgepic['accommodation_roomname'])) $showcasepics[alt][] = $lodgepic['accommodation_roomname'];
    else $showcasepics[alt][] = '';
}

---

这些实际上是数组的数组。主数组是一个关联数组，因此需要循环该数组的所有键以获得切片：

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

---

这些实际上是数组的数组。主数组是一个关联数组，因此需要循环该数组的所有键以获得切片：

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

---

array\u chunk-将数组拆分为块

$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;

$array1=数组（“1”=>“绿色”、“2”=>“棕色”、“3”=>“蓝色”、“4”=>“黑色”）；
$array2=数组（“5”=>“黄色”、“6”=>“橙色”、“7”=>“紫色”、“8”=>“白色”）；
$ArrayLength 1=ceil（计数（$array1）/2）；
$res1=数组块（$array1，$arrayLength 1）；
$ArrayLength=ceil（计数（$array2）/2）；
$res2=数组块（$array2，$arrayLength 2）；
回声“；
印刷费（$res1）；
印刷费（$res2）；
回声“；
出口

---

试试这个。

数组\u块-将数组拆分为块

$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;

$array1=数组（“1”=>“绿色”、“2”=>“棕色”、“3”=>“蓝色”、“4”=>“黑色”）；
$array2=数组（“5”=>“黄色”、“6”=>“橙色”、“7”=>“紫色”、“8”=>“白色”）；
$ArrayLength 1=ceil（计数（$array1）/2）；
$res1=数组块（$array1，$arrayLength 1）；
$ArrayLength=ceil（计数（$array2）/2）；
$res2=数组块（$array2，$arrayLength 2）；
回声“；
印刷费（$res1）；
印刷费（$res2）；
回声“；
出口

---

试试这个。

我很难理解像你建议的那样做的必要性，如果是我，我不会使用你的结构填充数组，我会创建如下数组：

$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);
}

此数组结构将图像属性保持在一起，而不是将它们分开

tomtheman5在那里有80%，但忽略了需要传递以获得正确切片的数组_切片调用的偏移量和长度参数。然而，他确实提出了一个很好的观点，如果您坚持使用数组结构，那么如果在每个“pic”和“alt”数组中没有匹配的元素，您可能会遇到问题。如果这不是一个问题，那么考虑下面的片段：

$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);

--编辑--

---

我很难理解是否需要像您建议的那样做，如果是我，我不会使用您的结构填充数组，我会创建如下数组：

$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);
}

此数组结构将图像属性保持在一起，而不是将它们分开

tomtheman5在那里有80%，但忽略了需要传递以获得正确切片的数组_切片调用的偏移量和长度参数。然而，他确实提出了一个很好的观点，如果您坚持使用数组结构，那么如果在每个“pic”和“alt”数组中没有匹配的元素，您可能会遇到问题。如果这不是一个问题，那么考虑下面的片段：

$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);

--编辑--

---

这似乎是一个局部解决方案，“…”表示需要传递给数组_切片调用的偏移量和长度。对不起，应该已经指定了。我不知道奇数个元素的预期行为应该是什么，所以我没有尝试。这似乎是部分解决方案，“…”表示需要传递给数组_切片调用的偏移量和长度。抱歉，应该已经指定了。我不知道奇数元素的预期行为应该是什么，所以我没有尝试。嗨，迈克，谢谢你的建议，非常有用。我在我的原始帖子中包含了我用来构造数组的代码，你能检查一下吗？也许我可以简单地调整数组，使其更易于切片和使用-thanks@Fulvio：更新了文章，介绍了构建图像数组的建议方法。嗨，迈克，谢谢你的建议，非常有用。我在原始文章中包含了构建数组的代码，你能检查一下吗？也许我可以简单地调整数组，使其更易于切片和使用-thanks@Fulvio：更新帖子，介绍构建图像阵列的建议方法。