php - 带有回调/值而不是间隔的array_chunk？

Question

我想通过在每个日期值处破坏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，它通过检测值是否是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？我担心的是，它array_chunk适用于一段时间，但没有任何变化。如果 PHP 不能在回调中分块，我会感到非常惊讶。

我知道有一个类似的问题被问到，但答案是手动循环遍历每个值。（根据值将数组分组）。

Answer 1

• [x] 测试和工作。

• [ ] 比你的 foreach 循环更简单？:)

  // 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);
  

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)