使用PHP从字符串中删除html元素

Question

我很难弄清楚怎么做，我有一个字符串看起来像这样…

    $text = "<p>This is some example text This is some example text This is some example text</p>
             <p><em>This is some example text This is some example text This is some example text</em></p>
             <p>This is some example text This is some example text This is some example text</p>";

我基本上想使用像preg_repalce和正则表达式这样的东西来删除

<em>This is some example text This is some example text This is some example text</em>

所以我需要编写一些PHP代码来搜索打开的<em>和关闭的</em>，并删除其间的所有文本

希望有人能帮忙，谢谢。

Answer 1

如果您对非正则表达式解决方案感兴趣，也可以执行以下操作：

<?php
    $text = "<p>This is some example text This is some example text This is some example text</p>
             <p><em>This is some example text This is some example text This is some example text</em></p>
             <p>This is some example text This is some example text This is some example text</p>";


    $emStartPos = strpos($text,"<em>");
    $emEndPos = strpos($text,"</em>");

    if ($emStartPos && $emEndPos) {
        $emEndPos += 5; //remove <em> tag aswell
        $len = $emEndPos - $emStartPos;

        $text = substr_replace($text, '', $emStartPos, $len);
    }

?>

这将删除标签之间的所有内容。

Answer 2

$text = preg_replace('/([\s\S]*)(<em>)([\s\S]*)(</em>)([\s\S]*)/', '$1$5', $text);

Answer 3

使用strrpos查找第一个元素，然后查找最后一个元素。使用substr获取字符串的一部分。然后用原始字符串中的空字符串替换该子字符串。