PHP替换pre标签之间

Question

我想替换PHP中<br />标记之间的<pre></pre>标记。 像这样：

$content = "Hello,<br /> <-- don't replace

Line 1<br /> <-- don't replace
Line 2<br /> <-- don't replace

<pre>Line 3<br /> <-- replace
Line 4</pre>";

我该怎么做？

Answer 1

function get_string($string, $start, $end){
 $string = " ".$string;
 $pos = strpos($string,$start);
 if ($pos == 0) return "";
     $pos += strlen($start);

 $len = strpos($string,$end,$pos) - $pos;

 $changeString = str_replace("<br />", "<replacement>", substr($string,$pos,$len) ); 
 // above line replace <br /> data with <replacement>

 return substr($string,0,$pos).$changeString.substr($string,$pos+$len);
}


$parsed = get_string($content , "<pre>", "</pre>");
echo $parsed; 

  

我很困惑，因为您帖子中的$ content中没有 pre 标记...   只有我看到代码标签