PHP在字符串前后插入一些文本

问题描述：

我对PHP还是很陌生，有一个包含HTML页面的String.我需要在任何 HR HTML标签之前和之后插入一些自定义代码.示例:

I'm pretty new to PHP and have a String which contains an HTML page. I'd need to insert some custom code BEFORE and AFTER any HR HTML tag. Example:

    <html>
    ....
     <p>INSERT HERE</p> 
     <hr class="pagebreak">
     <p>INSERT HERE</p> 

     <p>INSERT HERE</p> 
     <hr class="pagebreak">
     <p>INSERT HERE</p> 
    ....
    </html>

我尝试使用 preg_replace 和 substr_replace 的几种组合，但是我仍然无法在所有需要的地方插入自定义代码. 有人可以帮助我解决这个难题吗? P.s.我需要使用PHP标准的String函数-我无法使用任何HTML解析库，因为我无法控制服务器上可用的PHP库. 非常感谢琳达

I've tried with several combinations of preg_replace and substr_replace, however I still couldn't manage to insert the custom code in all places I need. Anybody can help me to solve this puzzle ? P.s. I need to use PHP standard String functions- I cannot use any HTML parsing library since I don't have control over the PHP libraries available on the server. Thanks a lot Linda

答

您所需要获得的只是一个好的正则表达式，假设您设法使其至少部分起作用，那么您的表达式可能很差(示例会有所帮助).我为您测试了此代码，它应该可以在您的所有<hr>上运行:

All you need to get is good regular expression, assuming that you managed to get it work at least partially, you propably had bad expression (example would help). I tested this code for you and it should work on all your <hr>s:

$newtext=preg_replace("#(<hr[^>]*>)#s",$yourprefix."\${1}".$yoursuffix,$oldtext);

可变的旧文本是您以前拥有的，新文本是您想要的，而前缀和后缀是您想要在hr标签周围添加的

variable oldtext is what you had before, new text is what you want, and prefix and suffix is what you want to add around hr tag

PHP在字符串前后插入一些文本

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