为什么会出现以下段错误,我该如何预防?
<?php
$str = ' <fieldset> <label for="go-to">Go to: </label> '
. str_repeat(' ', 10000)
. '<input type="submit" value="Go" /> </fieldset> </form>';
preg_match_all("@
</?(?![bisa]\b)(?!em\b)[^>]*> # starting tag, must not be one of several inline tags
(?:[^<]|</?(?:(?:[bisau]|em|strong|sup)\b)[^>]*>)* #allow text and some inline tags
[\?\!\.]+
@ix", $str, $matches);
?>
我相信它会导致......等待它......堆栈溢出。
编辑:
以上是演示问题的模式的简化版本。更完整的版本:
@
</?(?![bisa]\b)(?!em\b)[^>]*> # starting tag, must not be one of several inline tags
(?:[^<]|</?(?:(?:[bisau]|em|strong|sup)\b)[^>]*>)* # continue, allow text content and some inline tags
# normal sentence ending
[\?\!\.]+ # valid ending characters -- note elipses allowed
(?<!\b[ap]m\.)(?<!\b[ap]\.m\.)(?<!digg this\!)(?<!Stumble This\!) # disallow some false positives that we don't care about
\s*
(?:'|&\#0*34;|'|‘)?\s* # closing single quotes, in the unusual case like "he said: 'go away'".
(?:"|"|&\#0*34;|&\#x0*22;|”|&\#0*8221;|&\#x0*201D;|''|``|\xe2\x80\x9d|&\#0*148;|&\#x0*94;|\x94|\))?\s* # followed by any kind of close-quote char
(?=\<) # should be followed by a tag.
@ix
目的是找到似乎以有效英文句子结尾结尾的 html 块。我发现这种方法非常擅长区分“内容”文本(如文章正文)和“布局”文本(即,如导航元素)。但是,有时如果标签之间有大量空白,它就会爆炸。