PHP在循环中指定顺序，并以此对html输出进行分组 - PHP specify order in a loop and group html output by that

我有一个对象数组，我想按指定顺序以3组的形式输出。现在，我的输出在每3个元素后对数据进行分组，但遗憾的是，这已经很好了。所以现在我需要按以下顺序对其进行分组：

1组：1、4、7、10、。。。等等

2组：2，5，8，11。。。等等

3组：3，6，9，12。。。等等

但我不知道怎么做。

直到现在，我都是这样做的：

<?php
$group=3;
$count = (count($this->data));
$i=0;
foreach($this->data as $key => &$result){
  $row = ( ((int)$key) % (int)$group)+1;
  if($row==1){
    echo '<div class="row">';
  }
  echo '<div class="item-'.($i+1).'">';
  /*echoing a lots of stuf*/
  echo '</div>';
  $i++;
  if($row == $group || $i == $count){
    echo '<hr />';
    echo '</div>';
  }
}
?>

但正如我之前所写的，已经不好了

如果我的问题不清楚，这里是我想要的html输出：

<div class="row">
  <div class="item-1"></div>
  <div class="item-4"></div>
  <div class="item-7"></div>
  <div class="item-10"></div>
</div>
<div class="row">
  <div class="item-2"></div>
  <div class="item-5"></div>
  <div class="item-8"></div>
  <div class="item-11"></div>
</div>
<div class="row">
  <div class="item-3"></div>
  <div class="item-6"></div>
  <div class="item-9"></div>
  <div class="item-12"></div>
</div>

这可能吗？

现在我真的知道你想要什么了，你可以这样做：

$group = 3;
$length = count( $this->data );
$matrix = array();
for ( $i = 0, $row_n = 0; $i < $length; ++$i, $row_n++ ) {
    // Reset row.
    if ( $row_n === $group ) {
        $row_n = 0;
    }
    // Set cell.
    $row =& $matrix[$row_n];
    $row[] = 0;
    // Find column nr.
    end( $row );
    $cell_n = key( $row );
    // Update with correct key nr.
    $key = $row_n + $cell_n * $group;
    $row[$cell_n] = $key;
}
/*
echo "<pre>";
print_r( $matrix );
echo "</pre>";
*/
foreach ( $matrix as $row_n => $row ) {
    echo "'n<div class='row'>";
    foreach ( $row as $cell_n => $key ) {
        echo "'n't<div class='item-". ($key + 1) ."'>";
        echo $this->data[$key];
        echo "'n't</div>";
    }
    echo "'n</div>";
}

如果您想直接执行，只需将原始数组拆分为您想要的组，然后使用新的、重新排序的数组打印出HTML。

$a = array(1,2,3,4,5,6,7,8,9,10,11,12);
$array = array();
$group = 3; // <--- how many groups you want
$pointer = 0; //init pointer to first group
foreach($a as $value) {
    if($pointer == $group) $pointer = 0; // reset pointer
    $array[$pointer][] = $value; // two detention array have groups -> items
    $pointer++;
}
//use new sorted array print HTMl
foreach($array as $classRow) {
    echo "<div class='row'>";
    foreach($classRow as $item) {
        echo "<div class='item-".$item."'></div>";  
    }
    echo "</div>";
}

你可以试试这样的东西：

$data = array(1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18);
$groups = 3;
$items_per_group = count($data) / $groups;
$i     = 0;
$item  = 0;
$row   = 0;
$open = false;
foreach ( $data as $key => &$result ) {
    if ( $i % $items_per_group === 0 ) {
        $row++;
        $item = 0;
        if ( $open ) {
            echo "'n</div>";
        }
        echo "'n<div class='"row'">";
        $open = true;
    }
    $nr = $row + $item * $groups;
    echo "'n't<div class='"item-$nr'">";
    // echoing a lots of stuf
    echo "'n't</div>";
    $item++;
    $i++;
}
if ( $open ) {
    echo "'n</div>";
}

其中可能有一些错误，但我希望你能领会要点；）