blocks|key|2217051|text|我也认为正则表达式是最好的选择，因为它们给了你更多的灵活性。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2217052|我猜最简单的解决方案是首先从输出源获取所有这些事件，然后对其余代码使用str_replace，然后将其放回原处。我可能还会一行接一行地检查代码，只运行str_replace|2217053|同样，您最好的机会是使用正则表达式。你正在寻找的似乎是preg_replace，告诉它不要匹配@media之前的任何内容|2217054|参考文献：|2217055|2217056|http://php.net/manual/en/function.preg-match.php|unordered-list-item|offset|length|2217057|http://php.net/manual/en/function.preg-replace.php|2217058|2217059|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|0|0|0|0|1C|0|0|0|1E|1|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|10|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|11|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|12|8|@]|9|@]|A|$]]|$1|I|3|J|5|K|7|13|8|@]|9|@$L|14|M|15|1|16]]|A|$]]|$1|N|3|O|5|K|7|17|8|@]|9|@$L|18|M|19|1|1A]]|A|$]]|$1|P|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|J]]|X|$5|T|U|V|A|$W|O]]]]

I also think that regular expressions are the way to go as they give you much more flexibility. 

I guess the naive solution is to first fetch all those occurrences from the output source, then using str_replace on the remaining code and then putting it back. Might also try going through the code line after line and only running str_replace

Again, your best chance is with Regular Expressions. What you're looking for seems to be preg_replace, telling it not to match anything followed before by @media

References:

<ul>
<li><a href="http://php.net/manual/en/function.preg-match.php" rel="nofollow">http://php.net/manual/en/function.preg-match.php</a></li>
<li><a href="http://php.net/manual/en/function.preg-replace.php" rel="nofollow">http://php.net/manual/en/function.preg-replace.php</a></li>
</ul>

blocks|key|1197431|text|正则表达式不能计数，所以它们通常不适合解析(这就是您正在做的)。也就是说，除非你能限制输入格式超过有效CSS的全集，否则你可能会发现有些情况不能像预期的那样工作。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1197432|您还可以尝试完全解析CSS，并使用规则遍历生成的CSS树，以指定如何输出数据。这里显然有一个CSS解析器库：|1197433|http://www.phpclasses.org/package/1289-PHP-CSS-parser-class.html|offset|length|1197434|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|1S|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|P|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|Q|8|@]|9|@$F|R|G|S|1|T]]|A|$]]|$1|H|3|-4|5|6|7|U|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|E]]]]

Regular expressions can't count, so they're not generally appropriate for parsing (which is what you're doing). Ie, unless you can restrict the input format more than the full set of valid CSS, you may find some cases don't work as expected.

You could also try fully parsing the CSS and walk the resultant CSS tree using rules to specify how you output the data. There's apparently a CSS parser library here:

<a href="http://www.phpclasses.org/package/1289-PHP-CSS-parser-class.html" rel="nofollow">http://www.phpclasses.org/package/1289-PHP-CSS-parser-class.html</a>

blocks|key|1197442|text|$string+=+
"@media+blah(this+can+be+any+value)+{
.class+{
++++property:+value;
++}
}/*ends*/

.otherclass+{property:value;}

.otherclass+{property:value;}

@media+blah(this+can+be+any+value)+{
.class+{
++++property:+value;
++}
}/*ends*/

.otherclass+{property:value;}

.otherclass+{property:value;}";

$arr+=+explode("\r",+$string);

$ignore_block+=+false;
for+($i+=+0;+$i+<+count($arr);+$i%2B%2B)
{
++++if+(strstr($arr[$i],+'@media'))
++++++++$ignore_block+=+true;
++++elseif+(strstr($arr[$i-1],+'/*ends*/'))
++++++++$ignore_block+=+false;

++++if+($ignore_block+==+false)
++++{
++++++++$arr[$i]+=+str_replace("{",+"{\n\t",+$arr[$i]);
++++++++$arr[$i]+=+str_replace("}",+"\n}\n",+$arr[$i]);
++++}
}
file_put_contents("test.txt",+implode("\n",+$arr));|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|1197443|正则表达式不能工作，因为lookbehind不允许可变长度。尝试遍历该文件。|unstyled|1197444|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$B|C]]|$1|D|3|E|5|F|7|J|8|@]|9|@]|A|$]]|$1|G|3|-4|5|F|7|K|8|@]|9|@]|A|$]]]|H|$]]

<pre><code>$string = 
"@media blah(this can be any value) {
.class {
 property: value;
 }
}/*ends*/

.otherclass {property:value;}

.otherclass {property:value;}

@media blah(this can be any value) {
.class {
 property: value;
 }
}/*ends*/

.otherclass {property:value;}

.otherclass {property:value;}";

$arr = explode("\r", $string);

$ignore_block = false;
for ($i = 0; $i &lt; count($arr); $i++)
{
 if (strstr($arr[$i], '@media'))
 $ignore_block = true;
 elseif (strstr($arr[$i-1], '/*ends*/'))
 $ignore_block = false;

 if ($ignore_block == false)
 {
 $arr[$i] = str_replace("{", "{\n\t", $arr[$i]);
 $arr[$i] = str_replace("}", "\n}\n", $arr[$i]);
 }
}
file_put_contents("test.txt", implode("\n", $arr));
</code></pre>

Regex won't work since lookbehind doesn't allow variable length. Try and loop through the file.

I am working to clean up CSS output with str_replace, but need to ignore certain block of strings with a defined start and end.

Ignore anything that starts with:

<pre><code>@media blah(this can be any value) {
</code></pre>

content to ignore:

<pre><code> .class {
 property: value;
 }
</code></pre>

and ends with:

<pre><code>}/*ends*/
</code></pre>

And do str_replace outside that block instead:

<pre><code>.otherclass {property:value;}
</code></pre>

PHP:

<pre><code>$output = str_replace("{", "{\n", $output);
$output = str_replace("}", "}\n", $output);
</code></pre>

The reason is that @media block need proper indentation which is already correctly formatted, and should not be touched by str_replace which simple return readable lines:

<pre><code> .otherclass {
 property:value;
 }
</code></pre>

How would you say it in PHP?

Thanks

PHP to ignore a string block from str_replace

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在用str_replace清理CSS输出，但需要忽略定义了开始和结束的某些字符串块。忽略所有以:开头的内容：@media blah(this can be any value) {要忽略的内容：  .class {    property: value;  }并以：}/*ends*/并在该块之外执行str_repl...

问忽略来自str_replace的字符串块
EN

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