PHP preg_match_all + str_replace [英] PHP preg_match_all + str_replace

问题描述

我需要找到一种方法来替换所有的 <p>在所有<blockquote>在 <hr/> 之前.

这是一个示例 html:

2012/01/03
<blockquote><h4>文件名</h4><p>好游戏</p></blockquote><blockquote><p>Laurie Ipsumam</p></blockquote><h4>一些标题</h4><小时/><p>Lorem Ipsum</p><blockquote><p>Laurel Ipsucandescent</p></blockquote>

这是我得到的:

 $pieces = purge("<hr", $theHTML, 2);$blocks = preg_match_all('/
(.*?)<\/blockquote>/s', $pieces[0], $blockmatch);如果($块){$t1=$blockmatch[1];对于 ($j=0;$j<$blocks;$j++) {$paragraphs = preg_match_all('/
/', $t1[$j], $paragraphmatch);如果($段落){$t2=$paragraphmatch[0];对于 ($k=0;$k<$paragraphs;$k++) {$t1[$j]=str_replace($t2[$k],'<p class=\"whatever\">',$t1[$j]);}}}}

我想我真的很接近，但我不知道如何将我刚刚拼凑和修改的 html 重新组合在一起.

解决方案

您可以尝试使用 simple_xml，或者更好的 DOMDocument (http://www.php.net/manual/en/class.domdocument.php) 之前它是一个有效的 html 代码，并使用此功能查找您要查找的节点并替换它们，为此您可以尝试 XPath (http://w3schools.com/xpath/xpath_syntax.asp).

编辑 1:

看看这个问题的答案:

正则表达式匹配除 XHTML 自包含标签之外的开放标签

I need to find a way to replace all the <p> within all the <blockquote> before the <hr />.

Here's a sample html:

<p>2012/01/03</p>
<blockquote>
    <h4>File name</h4>
    <p>Good Game</p>
</blockquote>
<blockquote><p>Laurie Ipsumam</p></blockquote>
<h4>Some title</h4>
<hr />
<p>Lorem Ipsum</p>
<blockquote><p>Laurel Ipsucandescent</p></blockquote>

Here's what I got:

    $pieces = explode("<hr", $theHTML, 2);
    $blocks = preg_match_all('/<blockquote>(.*?)<\/blockquote>/s', $pieces[0], $blockmatch); 

    if ($blocks) { 
        $t1=$blockmatch[1];
        for ($j=0;$j<$blocks;$j++) {
            $paragraphs = preg_match_all('/<p>/', $t1[$j], $paragraphmatch);
            if ($paragraphs) {
                $t2=$paragraphmatch[0]; 
                for ($k=0;$k<$paragraphs;$k++) { 
                    $t1[$j]=str_replace($t2[$k],'<p class=\"whatever\">',$t1[$j]);
                }
            }
        } 
    } 

I think I'm really close, but I don't know how to put back together the html that I just pieced out and modified.

解决方案

You could try using simple_xml, or better DOMDocument (http://www.php.net/manual/en/class.domdocument.php) before you make it a valid html code, and use this functionality to find the nodes you are looking for, and replace them, for this you could try XPath (http://w3schools.com/xpath/xpath_syntax.asp).

Edit 1:

Take a look at the answer of this question:

RegEx match open tags except XHTML self-contained tags

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