重置foreach循环内的计数器 - Resetting a counter inside a foreach loop

我正在尝试创建一个简单的foreach循环，该循环将对数组中的每16条记录进行分组。我还有另一个计数器（$s），我需要在4点后重新播种。

这是我的代码

$a = array(
  'book-1' => 'Book Title 1',
  'book-2' => 'Book Title 2',
  'book-3' => 'Book Title 3',
  'book-4' => 'Book Title 4',
  'book-5' => 'Book Title 5',
  'book-6' => 'Book Title 6',
  'book-7' => 'Book Title 7',
  'book-8' => 'Book Title 8',
  'book-9' => 'Book Title 9'
);
$i = 1;
$bookshelf = 1;
$s=0;
foreach ( $a as $k => $v ) 
{
    if ($i == 9 || $i == 1)
    {  
      echo '<div id="bookshelf-'.$bookshelf.'"></div>';
      $bookshelf++;
    }

    if ($i%4 == 1)
    {  
      echo '<div class="bookshelf-bottom">';
    }
    if ($i > 5)
    {  
      $s=0;
    }
    $s++;
    echo '<div class="book-frame-'.$s.'">'.$v.'</div>';
    if ($i%4 == 0)
    {
      echo '</div>';
    }
    $i++;
}
if ($i%4 != 1) echo '</div>';

我想出口的是：

<div id="bookshelf-1" class="bookshelf-top"></div>
<div class="bookshelf-bottom">
<div class="book-frame-1">Book Title 1</div>
<div class="book-frame-2">Book Title 2</div>
<div class="book-frame-3">Book Title 3</div>
<div class="book-frame-4">Book Title 4</div>
</div>
<div class="bookshelf-bottom">
<div class="book-frame-1">Book Title 5</div>
<div class="book-frame-2">Book Title 6</div>
<div class="book-frame-3">Book Title 7</div>
<div class="book-frame-4">Book Title 8</div>
</div>
<div class="bookshelf-bottom">
<div class="book-frame-1">Book Title 9</div>
</div>

看看

<?php
$a = array(
    'book-1' => 'Book Title 1',
    'book-2' => 'Book Title 2',
    'book-3' => 'Book Title 3',
    'book-4' => 'Book Title 4',
    'book-5' => 'Book Title 5',
    'book-6' => 'Book Title 6',
    'book-7' => 'Book Title 7',
    'book-8' => 'Book Title 8',
    'book-9' => 'Book Title 9'
);
$i = 1;
$bookshelf = 1;
$s=0;
foreach ( $a as $k => $v ) {
    $s++;
    if ($i == 9 || $i == 1) {
        if($i == 1)
            echo '<div id="bookshelf-'.$bookshelf.'" class="bookshelf-top"></div>';
        else
            echo '<div id="bookshelf-'.$bookshelf.'"></div>';
      $bookshelf++;
    }
    if($s == 1)
        echo '<div class="bookshelf-bottom">';
    echo '<div class="book-frame-'.$s.'">'.$v.'</div>';
    if($s == 4) {
        echo '</div>';
        $s = 0;
    }
    $i++;
}
?>

如果代码变得更加复杂，那么执行此操作的方式将非常难以理解。相反，我会选择这样的东西：

$a = array(
  'book-1' => 'Book Title 1',
  'book-2' => 'Book Title 2',
  'book-3' => 'Book Title 3',
  'book-4' => 'Book Title 4',
  'book-5' => 'Book Title 5',
  'book-6' => 'Book Title 6',
  'book-7' => 'Book Title 7',
  'book-8' => 'Book Title 8',
  'book-9' => 'Book Title 9'
);
$i = 1;
$bookshelf = 1;
foreach ( array_chunk($a, 4) as $section ) 
{
    echo '<div class="bookshelf-bottom">';
    foreach( $section as $k => $v ) 
    {
        // Output this for the first and last item. I'd recommend taking this out of the foreach or restructuring this somehow to avoid the manual check.
        if ($i == 9 || $i == 1)
        {  
          echo '<div id="bookshelf-'.$bookshelf.'"></div>';
          $bookshelf++;
        }
        $i++;
        // Output this book.
        echo '<div class="book-frame-'.$s.'">'.$v.'</div>';
    }
    echo '</div>';
}

这使用array_chunk来创建部分，然后对这些部分进行迭代以生成html。

编辑：如果你想包含一个完整的数组，其中包含更多的值和更多你需要生成的HTML，我很乐意修改这个foreach并解释它是如何工作的。