多次<br /> <br ><br /> \r\n发生需要替换为<br/>。

Question

我需要将<br />、<br>、<br/>、\r、\n、\r\n的多次出现替换为1 <br />，但只有在出现在一起的情况下，才能将段落拆分成数组，并在字符串末尾剪短br标记的最后一行.

字符串示例可以如下所示：

This is paragraph 1<br>

This is paragraph 2<br /><br>



This is paragraph 3
This is paragraph 4


This is paragraph 5<br/>
This is paragraph 6


This is paragraph 7<br />This is paragraph 8

This is paragraph 9<br>

我试过的是：

$description = !empty($results['Description']) ? strip_tags(rtrim(str_replace(array("\n", "\r", "\r\n", "<br>", "<br/>", "<br />"), array("<br />"), $results['Description']), '<br />'), '<br><a>') : '';

$paragraphs = array_filter(explode("<br />", $description));

但这会把所有的线段都剪掉。我需要维护行符在字符串中的位置，但只需要执行1次换行操作，并删除所有其他代码。怎么做？

注意:我使用strip_tags是因为我只想在$description字符串中允许<br>和<a>标记。

Answer 1

您可能想先尝试使用行尾(PHP_EOL)爆炸，除去除<a>之外的所有东西，然后是array_filter()、implode()和trim()。

$str    =   'This is paragraph 1<br>

This is paragraph 2<br /><br>



This is paragraph 3
This is paragraph 4


This is paragraph 5<br/>
This is paragraph 6


This is paragraph 7<br />';

$str    =   trim(implode('<br />'.PHP_EOL,array_filter(explode(PHP_EOL,strip_tags($str,'<a>')))));

echo $str;

给你：

This is paragraph 1<br />
This is paragraph 2<br />
This is paragraph 3<br />
This is paragraph 4<br />
This is paragraph 5<br />
This is paragraph 6<br />
This is paragraph 7

您的第二个场景：

$str    =   'This is paragraph 1<br>

This is paragraph 2<br /><br>



This is paragraph 3
This is paragraph 4


This is paragraph 5<br/>This is paragraph 5
This is paragraph 6


This is paragraph 7<br />';

# Explode on line breaks and remove empty lines
$exp    =   array_filter(explode(PHP_EOL,$str));
# Loop array and filter the lines
$new    =   array_map(function($v) {
                return strip_tags(trim($v,'<br>,<br />,<br/>'),'<a><br>');
            },$exp);
# Implode the array back
echo implode('<br />'.PHP_EOL,$new);

给你：

This is paragraph 1<br />
This is paragraph 2<br />
This is paragraph 3<br />
This is paragraph 4<br />
This is paragraph 5<br/>This is paragraph 5<br />
This is paragraph 6<br />
This is paragraph 7