無法切片數組 - 我需要將數組分割成一半

我有一個數組，顯示如下。我想把它分成兩半，並從兩半中創建兩個新陣列。但是，如果我使用array_slice，它總是返回null ...我不明白爲什麼。無法切片數組 - 我需要將數組分割成一半

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)

我需要的陣列應該保留鍵，只是切成兩半，所以我有兩個免費的一半。例如，上半年應該是這樣的：

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

和下半年：

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)

感謝

PS - 邁克，這是我使用的是什麼使陣列，實際上它是由其他陣列構成的：

$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][] = ''; 
}

來源

2012-01-13 unfulvio

我很難把握，需要做一些像你所建議的東西，如果是我，我不會使用結構填充數組，我將創建一個這樣的數組：

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)

該數組結構將圖像屬性保留在一起，而不是將它們分開。

tomtheman5有80％存在，但省略了偏移量，並且需要傳遞array_slice調用的長度參數以獲取正確的切片。不過他的確提供了一個很好的觀點，如果你堅持使用數組結構，那麼如果每個'pic'和'alt'數組中沒有匹配的元素，就可能會遇到問題。如果這不是一個問題，然後再考慮下面的代碼片段：

$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); 
}

- 編輯 -

$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);

來源

2012-01-13 05:28:52

嗨邁克，感謝您的建議是非常有幫助的我已經包含了我在原始文章中構建數組的代碼，可以檢查它嗎？也許我可以簡單地調整數組，使其更容易切片和使用 - 謝謝 – unfulvio 2012-01-13 06:18:43

http://stackoverflow.com/questions/8849009/create-merging-multidimensional-array-with-key-pairs-from-different-keys- two-d – unfulvio 2012-01-13 11:18:21

@Fulvio：用建議的方式更新了文章，以建立您的圖像數組。 – 2012-01-13 19:18:54

這些實際上是數組的數組。主陣列是一個關聯數組，所以你會通過，以便在該陣列的所有密鑰需要循環，讓您的切片：

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

來源

2012-01-13 04:56:39

這似乎是一個局部的解決方案，「...」表示偏移和長度需要傳遞給array_slice調用。 – 2012-01-13 05:06:20

對不起，應該有具體說明。不知道預計的行爲應該與奇數個元素有什麼關係，所以我沒有嘗試。 – 2012-01-13 05:13:48

array_chunk - 斯普利特的數組分成塊

$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;

嘗試這個。

來源

2012-01-13 05:17:11

無法切片數組 - 我需要將數組分割成一半

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