[2003-10-20 18:35 UTC] kees at tweakers dot net

We've fixed it be commenting line 421 of ext/standard/html.c:

420-    { '\'', "'",       6,      ENT_HTML_QUOTE_SINGLE },
421:/*  { '\'', "'",        5,      ENT_HTML_QUOTE_SINGLE }, */

 [2003-10-20 19:04 UTC] acm at tweakers dot net

Well, it's cute that both are valid, but that's not the point...
get_html_translation_table is supposed to return "how php's functions translate it", not "any way which is valid".

And in that way, it _fails_ to do so.
Since the function html_entity_decode is only available as of php-4.3.0, anyone who has a similar function (based on the php-example on the documentpage!), finds it broken because of this.

In that sense it is, imho, a bug.
Quoting you're own documentation:
"get_html_translation_table --  Returns the translation table used by htmlspecialchars() and htmlentities()"

 [2003-10-20 21:51 UTC] moriyoshi@php.net

Not quite. When you have to write your own html_entity_decode(), you should cope with any forms of the numeric entity including hexadecimal style. It's not as simple as the snippet in the manual page.

 [2003-10-21 05:14 UTC] acm at tweakers dot net

Well, maybe so.

But I was refering to a function that tries to undo the changes of htmlspecialchars/htmlentities.

If htmlspecialchars changes ' to ' and you want to depend on get_html_translation_table to undo all changes, you expect it to return ' = ' instead of ' = ', since that's the change htmlspecialchars/htmlentities did aswell.
It didn't change it to '

If you really wanted to create a perfect entity-decoder, you'd indeed have to cope with all those &*; entities, including all the &#[0-9]{2,3};-like entities.

But for the simple "undo the htmlspecialchars"-like function that is not necessary.

And again, get_html_translation_table returns "how the htmlspecialchars/entities functions do it", not "all possible translations" or "just a valid version, maybe not what our own functions do", doesn't it? :)

To explain what I mean:
if you do 
echo html_entity_decode(htmlspecialchars("'", ENT_QUOTES));
you get ' back.

If you do:
function my_entity_decoder($string)
{
$trans = array_flip(get_html_translation_table(ENT_HTML_SPECIALCHARS, ENT_QUOTES));
$original = strtr($encoded, $trans);
}

echo my_entity_decoder(htmlspecialchars("'", ENT_QUOTES));
Where you trust the get_html_translation_table-function to return enough information to output ' again...

But if it all doesn't matter to you guys, why do the two change at all?
Why does the htmlspecialchars change it to ' why the get_html_translation_table claims it changes it to ' ??

 [2003-11-20 14:00 UTC] mike-php at emerge2 dot com

Does the same in Windows PHP 4.3.4.

 [2010-10-11 07:15 UTC] cataphract@php.net

 [2010-10-12 04:51 UTC] cataphract@php.net

Automatic comment from SVN on behalf of cataphract
Revision: http://svn.php.net/viewvc/?view=revision&revision=304340
Log: - Added a 3rd parameter to get_html_translation_table. It now takes a charset
  hint, like htmlentities et al.
- Fixed bug #49407 (get_html_translation_table doesn't handle UTF-8).
- Fixed bug #25927 (get_html_translation_table calls the ' ' instead of
  ').
- Fixed tests for get_html_translation_table and unified the Windows and
  non-Windows versions of the tests.