Question

我设置了一个事件循环;我也设置了广告循环。

我想注入每个广告＆＃39;进入随机点的事件循环。这些循环/数组具有不同的设置，因此无法进入循环/数组。

我有以下设置，这往往有效，但在ad.inc中，它是一个随机的广告...而应该是获得广告的总数并将它们随机地注入到事件中，直到该计数为止达到。

$count = 1;
$total = count($events);
$random = rand(3, $total);

foreach ($events as $event) {

    include('./inc/events-item.inc');

    if ($count == $random) {

        include("./inc/ad.inc");
        $random = rand($count, $total);

    }

    $count++;

}

例如，如果我的总事件数为30，而我的广告总数为4，那么我应该会看到这四个广告随机注入到30个事件中。

任何帮助？

Answer 1

为广告创建所有排名的数组。如果你有30个广告 - 有30个位置，从0到29：

$positions = range(0, 29);
// now get 4 random elements from this array:
$rand_positions = array_rand($positions, 4);
// though `array_rand` returns array of keys
// in this case keys are the same as values

// iterate over your events and if counter equals 
// to any value in $rand_positions - show ad
$i = 0;
foreach ($events as $event) {
    include('./inc/events-item.inc');
    if (in_array($i, $rand_positions, true)) {
        include("./inc/ad.inc");
    }
    $i++;
}

Answer 2

您需要随机选择4个（或者您拥有的广告数量）在30个（或者您拥有的条目数量）之间的其他点数。这是一个可能的解决方案。

// Set up counts
$entry_count = count($events);
$ad_count = 4;

// Create an array of entry indices, and an array of ad indices
$entry_indices = range(0, $entry_count - 1);
$ad_indices = array();

// Fill the ad indices with random elements from the entry indices
for ($i = 0; $i < $ad_count; $i++) {
  $entry = rand(0, count($entry_indices));
  array_push($ad_indices, $entry_indices[$entry]);
  array_splice($entry_indices, $entry, 1);
}

// Sort it so we only need to look at the first element
sort($ad_indices);

// Iterate through the events
$count = 0;
foreach ($events as $event) {
  include('./inc/events-item.inc');
  // If we have any ad indices left, see if this entry is one of them
  if (count($ad_indices) > 0 && $count == $ad_indices[0]) {
    include("./inc/ad.inc");
    array_shift($ad_indices);
  }
  $count++;
}

随机添加＆＃39;项目＆＃39;或者＆＃39;广告＆＃39;进入PHP循环

2 个答案: