如何將數組的每個第n個元素排序爲不同的子陣列？

Question

我有一個這樣的數組：

$arrayToFill=['a','b','c','d','e','f','g','h','k','l','m','n','o','p','r','u','w','x','y','z']; 

因此，有20個元素，我想陣列$batchArray看起來像這樣迭代後：

Array 
(
    [0] => Array 
     (
      [0] => Array 
       (
        [0] => a 
        [1] => b 
        [2] => c 
        [3] => d 
        [4] => e 
       ) 

      [1] => Array 
       (
        [0] => f 
        [1] => g 
        [2] => h 
        [3] => k 
        [4] => l 
       ) 

     ) 

    [1] => Array 
     (
      [0] => Array 
       (
        [0] => m 
        [1] => n 
        [2] => o 
        [3] => p 
        [4] => r 
       ) 

      [1] => Array 
       (
        [0] => u 
        [1] => w 
        [2] => x 
        [3] => y 
        [4] => z 
       ) 

     ) 

) 

所以在第六，十一等元素的新子陣是在該子陣列的第二個上創建新的更大的陣列。這裏是我嘗試和我做了什麼到現在：

$a=0; 
$i=0; 
$arrayToFill=['a','b','c','d','e','f','g','h','k','l','m','n','o','p','r','u','w','x','y','z']; 
$batchArray=[]; 
$batchArray[$a]=[]; 
$batchArray[$a][$i]=[]; 

if($i==0){ 
    $currentNumber = ($i+1)*5; 
}else{ 
    $currentNumber = 5; 
} 

$currentNumberOfBathes=count($batchArray[$a])+1; 
$currentNumberBatch = 2; 

foreach($arrayToFill as $array){ 
    $numberOfElements=count($batchArray[$a][$i]); 
    $currentNumberOfBathes=count($batchArray[$a])+1; 
    if($numberOfElements>$currentNumber && $numberOfElements<$currentNumber+2){ 
     echo 'desilo se'; 
     echo $i; 
     $i++; 
     $batchArray[$a][$i]=[]; 
    } 

    array_push($batchArray[$a][$i],$array); 

} 

因此，這裏是我所得到的：

所有的

Array 
(
    [0] => Array 
     (
      [0] => Array 
       (
        [0] => a 
        [1] => b 
        [2] => c 
        [3] => d 
        [4] => e 
        [5] => f 
       ) 

      [1] => Array 
       (
        [0] => g 
        [1] => h 
        [2] => k 
        [3] => l 
        [4] => m 
        [5] => n 
       ) 

      [2] => Array 
       (
        [0] => o 
        [1] => p 
        [2] => r 
        [3] => u 
        [4] => w 
        [5] => x 
       ) 

      [3] => Array 
       (
        [0] => y 
        [1] => z 
       ) 

     ) 

) 

首先，幾個字母的地方丟失。當我試圖限制這種子陣列包含5個字母，以增加其指數第三次是這樣的：

foreach($arrayToFill as $array){ 

    $numberOfElements=count($batchArray[$a][$i]); 
    $currentNumberOfBathes=count($batchArray[$a])+1; 
    if($numberOfElements>$currentNumber && $numberOfElements<$currentNumber+2){ 
     $i++; 
     $batchArray[$a][$i]=[]; 
    } 
    if($currentNumberOfBathes>$currentNumberBatch && $currentNumberOfBathes<$currentNumberBatch+2){ 
     $a++; 
     $batchArray[$a]=[]; 
    } 
    array_push($batchArray[$a][$i],$array); 

} 

我得到這樣的輸出與警告：

Warning: array_push() expects parameter 1 to be array, null given 
Array 
(
    [0] => Array 
     (
      [0] => Array 
       (
        [0] => a 
        [1] => b 
        [2] => c 
        [3] => d 
        [4] => e 
        [5] => f 
       ) 

      [1] => Array 
       (
        [0] => g 
       ) 

     ) 

    [1] => Array 
     (
      [1] => 
     ) 

) 

那麼，是什麼在這裏發生，爲什麼連更大的謎團。請幫助

Answer 1

只需使用array_chunk()幾次即可大大簡化此操作。第一次將它分成數組數組，後者每個最多包含5個元素。然後第二次將分割成到每個2個元素的數組。

它更容易看到比它是說：

print_r(array_chunk(array_chunk($arrayToFill, 5), 2)); 

結果：

Array 
(
    [0] => Array 
     (
      [0] => Array 
       (
        [0] => a 
        [1] => b 
        [2] => c 
        [3] => d 
        [4] => e 
       ) 

      [1] => Array 
       (
        [0] => f 
        [1] => g 
        [2] => h 
        [3] => k 
        [4] => l 
       ) 

     ) 

    [1] => Array 
     (
      [0] => Array 
       (
        [0] => m 
        [1] => n 
        [2] => o 
        [3] => p 
        [4] => r 
       ) 

      [1] => Array 
       (
        [0] => u 
        [1] => w 
        [2] => x 
        [3] => y 
        [4] => z 
       ) 

     ) 

)