Question

我已经挣扎了几个小时

我需要转换此字符串

"> example quote /n"

到这个

<blockquote> example quote /n </blockquote>

所以，如果我有一个以上的引用＆＃34;＆gt;＆＃34;像这样

">> example quote /n"

看起来像这样

< blockquote>< blockquote>example quote < /blockquote >< /blockquote > <br>

另一个例子是：

＆＃34;＆gt;＆gt;这是一个很棒的字符串/ n＆gt;下一个引用＆＃34;

< blockquote>< blockquote> this is a great string < /blockquote >< /blockquote > <br>
< blockquote> next quote < /blockquote >

这是我目前的代码

            // plain comment
            $text = "> we are here /n";

            // explode into array
            $single_quotes = explode("/n", $text);

            $renderedHtml = "";
            $quoteopeners = "";
            $quoteclosers = "";

            //make blockquote out of it
            foreach($single_quotes as $quote)
            {
                $number_of_quotes = substr_count($quote,'>');

                for($i = 0; $i < $number_of_quotes; $i++)
                {
                   $quoteopeners.= '<blockquote>';
                   $quoteclosers.='</blockquote>';
                }

                //replace all the '>' with spaces
                $quote = str_replace('>','', $quote);
                $quote = str_replace('/n','', $quote);

                $renderedHtml.= $quoteopeners.$quote.$quoteclosers;
            }

出于某种原因我打字时＆＃34;＆GT;我们在这里/ n＆＃34;

它在结尾处呈现这些随机引用

<blockquote> we are here </blockquote><blockquote></blockquote>

如果你对这个问题有一个全新的解决方案，那也没关系

Answer 1

$ quoteopeners和$ quoteclosers未正确初始化。试试这个：

<?php
 // plain comment
    $text = ">> we are here /n";

    // explode into array
    $single_quotes = explode("/n", $text);

    $renderedHtml = "";

    //make blockquote out of it
    foreach($single_quotes as $quote)
    {
        $number_of_quotes = substr_count($quote,'>');

        $quoteopeners = "";
        $quoteclosers = "";

        for($i = 0; $i < $number_of_quotes; $i++)
        {
           $quoteopeners.= '<blockquote>';
           $quoteclosers.='</blockquote>';
        }

        //replace all the '>' with spaces
        $quote = str_replace('>','', $quote);
        $quote = str_replace('/n','', $quote);

        $renderedHtml.= $quoteopeners.$quote.$quoteclosers;
    }

    echo $renderedHtml;
?>

Answer 2

您可以使用preg_replace_callback()来完成此操作

<?php

 $str = preg_replace_callback(
            '/^(\>+) (\w+(\s+\w+)*)/',
            function ($matches) {
                return str_repeat("<blockquote>", strlen($matches[1])) . $matches[2] . str_repeat("</blockquote>", strlen($matches[1]));
            }, $string);
    echo $str;

例如;

//Output: <blockquote>This is a simple quote</blockquote>
$string = "> This is a simple quote";

//Output: <blockquote><blockquote>This is a simple quote</blockquote></blockquote>
$string = ">> This is a simple quote";

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