防止替换HTML标签中的表情符号 [英] Prevent replacements of emoticons in HTML-tags

问题描述

我使用简单的str_replace功能替换了我网站上的某些表情符号...

I use a simple str_replace-function to replace some emoticons on my website…

<?php

$replace = array(
    ':)' => 'smile',
    ';)' => 'wink',
    …
);

$string = 'Lorem ipsum (&quot;dolor&quot;) sit amet! :)';

foreach($replace as $search => $replace) {
    $string = str_replace($search, '<img src="/img/'.$replace.'.png" alt="'.$search.'">', $string);
}

?>

关于这种简单替换的问题是，"-标记中的;)"也将被替换，并且HTML代码将被破坏.有什么方法/解决方法(即特殊的正则表达式)解决此问题"吗?谢谢！ :)

The problem about this simple replacement is, that ";)" from the "-tag would be replaced aswell and the HTML-code would be broken. Is there any way/workaround (a special regex i.e.) to solve this "problem"? Thanks! :)

推荐答案

这是我的第二个答案，您是对的，最后我们需要使用正则表达式. 基本上，转义的搜索前面有$negation正则表达式，我想可以对其进行优化，但现在对我有用.

Here is My second answer, you are right, in the end we would need to use regex. Basically There's the $negation regex prepended to the escaped searches, I guess it can be optimized but for now it worked for me.

$smileys = array(
    ':)' => 'smile',
    ';)' => 'wink'
);

$string = 'Lorem ipsum ("dolor") sit amet! :)';

$negation = '[^&\w*]'; // Here is the magic, this is the part that avoids the search to be preceded by &+characters
foreach($smileys as $icon => $name) {
  $replace[] = '<img src="/img/'.$name.'.png" alt="'.$icon.'">'; //we create an array with the corresponding replaces
  $search[] = '/'.$negation.preg_quote($icon).'/'; //Magic second part, preg_quote escapes the smileys to sarch for PCRE, we prepend the magical regex.
}

$string = preg_replace($search, $replace, $string);

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