PHP-对标签内的所有内容进行编码

Question

I just want to make my blog as easy to code as it can be. And my question is:

How(if it's possible) to encode everything inside HTML tag <code> by htmlentities();

I'm want this: If I make a post about making something, I will don't need to encode it by some encoder online but simply make something like

"Just simply put
<code>
encoded code
</code>
and this <b>bold</b> text will be bold, because it isn't inside <code>

is it possible inside php code with some function used to be like

encode_tags($text,"<code>","</code>");

?

Answer 1

Your input string ( minorly edited to clarify my answer):

$string = "Just simply put
<code>
<p>encoded code</p>
</code>
and this <b>bold</b> text will be bold, 
because it isn't inside <code><b>code tags</b></code>";

Step 1:
Break your string into parts as surrounded by by <code> . Note your regex should use # not / as the delimiters so you don't need to care about the / in your </code> .

 preg_match_all("#<code>(.*?)</code>#is", $string, $codes);

Note the s at the end of the REGEX for ignoring line breaks on the group (*) .

The above code is lazy (see links at the bottom) and will also not match incomplete tags (such as <code> with no corresponding </code> ).

Step 2:
Make the HTML changes as required to each of the found substrings (You should be familiar with how preg_match_all returns the data from the function, see link at the bottom):

$replace = [];
foreach($codes[1] as $key=>$codeBlock ){
    $replace[$key] = htmlentities($codeBlock, ENT_QUOTES, "UTF-8", false);
}
unset($key, $codeBlock);

Step 3:
Apply the changes to the original values (theses are NOT the same as the converted values, used in Step 2):

foreach($codes[0] as $key=>$replacer){
    $string = str_replace($replacer, $replace[$key], $string);
}
unset($key, $replacer, $replace);

Output:

The above will then output:

Just simply put

<p>encoded code</p>

and this text will be bold, because it isn't inside <b>code tags</b>

---

You should have a familiar understanding of preg_match_* family of PHP functions as well as general PCRE REGEX .

Please also read this here , and here and read this and especially this .

Cheers