PHP将nbsp转换为“”

Question

I have been trying to get this to work for the last 3 hours but to no avail.

<?php
    foreach ($array as $item) {
      $item = preg_replace("~ (?=[^<>]*(<|$))~", "&nbsp;", $item);
      logWrite($item);
      echo $item;
    }
?>

the $array is made up of a list of items eg "bread" , "cheese" , "red wine" - the regexp is there to make sure it only works on text between the open and close html tags (courtesy of someone else here).

Anyway the problem is that when I write to the log - it comes out as "bread" , "cheese" , "red wine" but the echo (I have tried print as well) on the html page is unchanged from "bread" , "cheese" , "red wine" .

If I use a different character to replace eg ® it works fine. Any ideas why this particular entity does not work? I think my charsets are all fine.

Thanks!

Answer 1

You do not need to use regexp here. Try with:

$item = str_replace(' ', ' ', $item);

If you want to check if   is between HTML tags, you should do it before ( if statement, etc) - it will be more clear.

However do not use regexp with html - it's evil.

Answer 2

  is an HTML entity for "non-breaking space", so it's going to appear as a space (not the actual characters) in an HTML document, therefore you will not notice the difference between   and a normal space. View the source code and you will see it.

Answer 3

Assuming you're interested in decoding all HTML entities, you can use html_entity_decode :

http://www.php.net/manual/en/function.html-entity-decode.php

It's much simpler than trying to use a regex.

Answer 4

当您想在HTML页面上显示“原始” HTML内容时，应使用htmlspecialchars() ：

echo htmlspecialchars( $item );

Answer 5

As per http://magp.ie/2011/01/06/remove-non-utf8-characters-from-string-with-php/

I had some character that the parser does not know how to interput because it was outside the byte range of the UTF8 format. Some of the PHP functions, like iconv, still let some non-UTF8 characters through which breaks the parser. The preg_replace just rips out any non-UTF8 character based on it's byte sequence and replaces it with a question mark.

//reject overly long 2 byte sequences, as well as characters above U+10000 and replace with ?
$some_string = preg_replace('/[\x00-\x08\x10\x0B\x0C\x0E-\x19\x7F]'.
 '|[\x00-\x7F][\x80-\xBF]+'.
 '|([\xC0\xC1]|[\xF0-\xFF])[\x80-\xBF]*'.
 '|[\xC2-\xDF]((?![\x80-\xBF])|[\x80-\xBF]{2,})'.
 '|[\xE0-\xEF](([\x80-\xBF](?![\x80-\xBF]))|(?![\x80-\xBF]{2})|[\x80-\xBF]{3,})/S',
 '?', $some_string );

//reject overly long 3 byte sequences and UTF-16 surrogates and replace with ?
$some_string = preg_replace('/\xE0[\x80-\x9F][\x80-\xBF]'.
 '|\xED[\xA0-\xBF][\x80-\xBF]/S','?', $some_string );