Question

我有一个数组，用于跟踪视频ID，标题和说明。

每次在网站上执行搜索时，阵列都会更新。 foreach循环使用搜索到的所有数据更新数组，通常在每次搜索时在数组中添加8个新行。

我想要做的是在循环的开头插入注释行，以便在我调试时更容易滚动数组等。

正在发生的事情是每次传递时都会添加注释行，因此8条新线的注释行为8条。

示例：

// comment line
'1QmRjtsw2UQ' => array('pubdate' => '26 Jun 15', 'alt' => '8 Year Old Beautifully Covers Thinking Out Loud', 'description' => '8-yo \'Thinking Out Loud\''),
// comment line
'eKqLaYrcf3A' => array('pubdate' => '25 Jun 15', 'alt' => 'Plane Lands On Truck', 'description' => 'Plane Lands On Truck'),
// comment line
'B5_8D8HCnS4' => array('pubdate' => '24 Jun 15', 'alt' => 'Unbelievable Boeing 787 \'Vertical\' Take-off - Paris Air Show 2015', 'description' => '787 "Vertical" Take-Off'),
// comment line
'VQcNCc3Icx4' => array('pubdate' => '24 Jun 15', 'alt' => 'Dog Pops 54 Balloons In 3.3 Seconds', 'description' => 'Dog Pops 54 Balloons In 3 Sec'),
// comment line
'V1W-OC7MTCY' => array('pubdate' => '24 Jun 15', 'alt' => 'Lucky Lou', 'description' => 'Lucky Lou'),
// comment line
'zhbBuWSPbBk' => array('pubdate' => '23 Jun 15', 'alt' => 'Mentalist Oz Pearlman Reads Mel B\'s Mind - America\'s Got Talent 2015', 'description' => 'Oz Reads Mel B\'s Mind'),
// comment line
'SwhtbtSmcDs' => array('pubdate' => '23 Jun 15', 'alt' => 'Heidi Klum Hits Golden Buzzer for 11-Year-Old Opera Singer Arielle Baril', 'description' => '11-Year-Old Opera Singer'),
// comment line
'J_8mdH20qTQ' => array('pubdate' => '22 Jun 15', 'alt' => 'Stowaway Cat Surprises Pilot During Take-Off', 'description' => 'Stowaway Cat Surprise'),
// comment line

如何在数组中8个新行上方的循环开头添加注释行？

以下是我的代码示例。

数组：

$videoids = new ArrayIterator(array(
// comment line
'1QmRjtsw2UQ' => array('pubdate' => '26 Jun 15', 'alt' => '8 Year Old Beautifully Covers Thinking Out Loud', 'description' => '8-yo \'Thinking Out Loud\''),
'eKqLaYrcf3A' => array('pubdate' => '25 Jun 15', 'alt' => 'Plane Lands On Truck', 'description' => 'Plane Lands On Truck'),
'B5_8D8HCnS4' => array('pubdate' => '24 Jun 15', 'alt' => 'Unbelievable Boeing 787 \'Vertical\' Take-off - Paris Air Show 2015', 'description' => '787 "Vertical" Take-Off'),
'VQcNCc3Icx4' => array('pubdate' => '24 Jun 15', 'alt' => 'Dog Pops 54 Balloons In 3.3 Seconds', 'description' => 'Dog Pops 54 Balloons In 3 Sec'),
'V1W-OC7MTCY' => array('pubdate' => '24 Jun 15', 'alt' => 'Lucky Lou', 'description' => 'Lucky Lou'),
'zhbBuWSPbBk' => array('pubdate' => '23 Jun 15', 'alt' => 'Mentalist Oz Pearlman Reads Mel B\'s Mind - America\'s Got Talent 2015', 'description' => 'Oz Reads Mel B\'s Mind'),
'SwhtbtSmcDs' => array('pubdate' => '23 Jun 15', 'alt' => 'Heidi Klum Hits Golden Buzzer for 11-Year-Old Opera Singer Arielle Baril', 'description' => '11-Year-Old Opera Singer'),
'J_8mdH20qTQ' => array('pubdate' => '22 Jun 15', 'alt' => 'Stowaway Cat Surprises Pilot During Take-Off', 'description' => 'Stowaway Cat Surprise'),
));

Foreach循环：

    foreach ($searchResponse['items'] as $searchResult) {
      switch ($searchResult['id']['kind']) {
        case 'youtube#video':
          $videos .= sprintf('  <a data-rel="video" href="/%s"><img alt="%s" title="%s" src="https://i.ytimg.com/vi/%s/mqdefault.jpg" width="100" height="56"> <span style="display:none;">%s</span></a>
            ', $searchResult['id']['videoId'], clean($searchResult['snippet']['title']), clean($searchResult['snippet']['title']), $searchResult['id']['videoId'], clean($searchResult['snippet']['title']));

          $new_array_lines = "  '".$searchResult['id']['videoId']."' => array('pubdate' => '".date("d M y", strtotime($searchResult['snippet']['publishedAt']))."', 'alt' => '".addslashes(clean($searchResult['snippet']['title']))."', 'description' => '".addslashes(clean_both($searchResult['snippet']['description']))."'),";

          //file_put_contents($videoids_file, $new_array_lines.PHP_EOL , FILE_APPEND | LOCK_EX);

            if(array_key_exists($searchResult['id']['videoId'], $videoids)) {
                // do nothing
            } else {
                $id_content = file($videoids_file); // Parse file into an array by newline
                $id_data = array_pop($id_content);

                if (trim($id_data) == '));?>') {
                    $id_content[] = $new_array_lines;
                    $id_content[] = '
'.$id_data;
                    file_put_contents($videoids_file, implode($id_content));
                }
            }

          break;
        /*case 'youtube#channel':
          $channels .= sprintf('<li>%s (%s)</li>', $searchResult['snippet']['title'],
            $searchResult['id']['channelId']);
          break;
        case 'youtube#playlist':
          $playlists .= sprintf('<li>%s (%s)</li>', $searchResult['snippet']['title'],
            $searchResult['id']['playlistId']);
          break;*/
      }
    }

评论专栏：

    $comment_line = '   // '.$_GET['q'].'
';

Answer 1

一种简单的方法是在循环开始之前打印注释。如果由于任何原因无法做到这一点，您可以使用布尔值来标记它是否是第一次迭代：

$isFirst = true;
foreach ($searchResponse['items'] as $searchResult) {
   // ... prepare your output ...
   if ($isFirst) {
      echo '   // '.$_GET['q']."\n"; // Echo debug line
      $isFirst = false;
   }
   // .. echo array row ..
}

但正如评论中已经提到的：切换到数据库会更容易。值得最初的努力。

如何在foreach循环的开头插入注释行，而不是在每次遍历循环时插入注释行？

1 个答案: