Question

我想通过在每个日期值处打破一个数组来创建一个多数组：

array(
    '3/20/13', // date (start a new child array)
    '14',
    'dog',
    'red',
    '10/21/13', // date (start a new child array)
    '3',
    'cat'
)

我编写了一个复杂的foreach函数，它通过检测值是否为日期来构建一个新数组：

$date = DateTime::createFromFormat('n/d/y', $value);

我想知道是否有更简单的方法来拆分数组，还是我必须单独检查每个值？我担心array_chunk适用于某个时间间隔，但没有任何变体。如果PHP无法回调，我会感到非常惊讶。

我知道有一个类似的问题，但答案是手动循环每个值。（Breaking an array into groups based on values）。

Answer 1

[x]经过测试和工作。

[]比你的foreach循环简单吗？：）

// Source array to break into child arrays based on regular expression delimiter
$array = array(
    '3/20/13', // date (start a new child array)
    '14',
    'dog',
    'red',
    '10/21/13', // date (start a new child array)
    '3',
    'cat',
    '01/02/03', // another example
    '4',
    'badger'
);

// Regular expression to break array into child arrays
$delimiter = '/\//';

// Finds index position of matching delimiter in array (e.g. 0, 4)
$childIndex = array_keys(preg_grep($delimiter, $array));

// For each matching delimiter get the beginning index position and length of entries before next child begins - they part that array_chunk doesn't support. We feed these begin/length into array_slice next to make our own array
for ($i=0; $i<count($childIndex); $i++):
    $chunks[$i]['begin'] = $childIndex[$i];
    // Last chunk doesn't need a length
    if (isset($childIndex[$i+1])):
        $chunks[$i]['len'] = $childIndex[$i+1]-$childIndex[$i];
    endif;
endfor;

// For each begin/length chunk splice the source array into a child array
foreach ($chunks as $chunk):
    if (isset($chunk['len'])):
        $final[] = array_slice($array, $chunk['begin'], $chunk['len']);
    else:
        $final[] = array_slice($array, $chunk['begin']);
    endif;
endforeach;

// Our new nested array
var_dump($final);

<强>结果

// Source
array (size=10)
  0 => string '3/20/13' (length=7)
  1 => string '14' (length=2)
  2 => string 'dog' (length=3)
  3 => string 'red' (length=3)
  4 => string '10/21/13' (length=8)
  5 => string '3' (length=1)
  6 => string 'cat' (length=3)
  7 => string '01/02/03' (length=8)
  8 => string '4' (length=1)
  9 => string 'badger' (length=6)

// Found delimiter positions
array (size=3)
  0 => int 0
  1 => int 4
  2 => int 7

// Chunks
array (size=2)
  'begin' => int 0
  'len' => int 4
array (size=2)
  'begin' => int 4
  'len' => int 3
array (size=1)
  'begin' => int 7

// Final nested array
array (size=3)
  0 => 
    array (size=4)
      0 => string '3/20/13' (length=7)
      1 => string '14' (length=2)
      2 => string 'dog' (length=3)
      3 => string 'red' (length=3)
  1 => 
    array (size=3)
      0 => string '10/21/13' (length=8)
      1 => string '3' (length=1)
      2 => string 'cat' (length=3)
  2 => 
    array (size=3)
      0 => string '01/02/03' (length=8)
      1 => string '4' (length=1)
      2 => string 'badger' (length=6)

array_chunk有回调/值而不是间隔？

1 个答案: