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问计算所有<br />并将数字4替换为php
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Stack Overflow用户

提问于 2020-08-21 02:26:17

回答 1查看 35关注 0票数 0

我有这样的文本

"Hello, Hello, how are you?
Hello, Hello, how are you?<br />
Hello,
Hello,<br />
How are you?
How are you today?
I am fine; I am great
I am fine;<br />
I am just great
I am fine; I am great
I'm very well today!<br />
Great!
Hello, Hello, how are you?<br />
Hello, Hello, how are you?
Hello, Hello, How are you?<br />
How are you today?"

我需要将第四个<br />替换为<img>

如果只找到一个<br/>，只需替换第一个

就一次

我试着用

function str_replace_first($from, $to, $subject)
{
    $from = '/'.preg_quote($from, '/').'/';

    return preg_replace($from, $to, $subject, 1);
}

但它被替换了，只找到一号

我试着换掉4号

php

replace

回答 1

Stack Overflow用户

回答已采纳

发布于 2020-08-21 02:44:04

试试这个：

<?php

$txt  = "Hello, Hello, how are you?
Hello, Hello, how are you?<br />
Hello,
Hello,<br />
How are you?
How are you today?
I am fine; I am great
I am fine;<br />
I am just great
I am fine; I am great
I'm very well today!<br />
Great!
Hello, Hello, how are you?<br />
Hello, Hello, how are you?
Hello, Hello, How are you?<br />
How are you today?";

$occurrences = substr_count($txt, '<br />');
if( 1 === $occurrences ) {
    $txt = str_replace('<br />', "<img>", $txt);
} else {
    $counter = 1;
    $txt = preg_replace_callback("/<br \/>/", function ($m) use (&$counter) {

         // replace 4th occurance
         if ($counter++ == 4) {
              return "<img>";
         }

         return $m[0];

    }, $txt );
}

echo $txt;

票数 1

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/63511156

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