[php] Umkehrfunktion von htmlentities() ?

[thies_(at)_digicol.de]

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siehe anhang...

On Sat, Jul 22, 2000 at 11:28:40AM +0200, Andreas Korinek wrote:
> Hallo Liste,
> 
> wei? jemand von Euch ob es eine Umkehrfunktion vom htmlentities gibt, die z.B.
> "ü" wieder in "?" umwandelt?
> 
> --
> Mit freundlichen Gr??en
> 
> Andreas Korinek
> 
> info_(at)_bonsai-welt.de
> 
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Thies C. Arntzen                 "One Big-Mac, Small Fries and a Coke!"
Digital Collections             Phone +49 40 235350 Fax +49 40 23535180
Hammerbrookstr. 93                              20097 Hamburg / Germany

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Date: Fri, 2 Jun 2000 12:08:50 +0200
From: "Thies C . Arntzen" <thies_(at)_digicol.de>
To: =?iso-8859-1?Q?Martin_Storsj=F6?= <martin.storsjo_(at)_pp.qnet.fi>
Cc: php-general_(at)_lists.php.net
Subject: Re: [PHP-GENERAL] Reverse htmlentities
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On Thu, Jun 01, 2000 at 11:14:28PM +0300, Martin Storsjö wrote:
> Is there any way of doing a "reverse htmlentities()", e.g. translating
> "hello&nbsp;world" into "hello world", but also all other possible
> codes? I could of course use strtr in some way, but that's not what I'm
> looking for.
> 
> // Martin

    see my attached message.

> 
> 
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Thies C. Arntzen                 "One Big-Mac, Small Fries and a Coke!"
Digital Collections             Phone +49 40 235350 Fax +49 40 23535180
Hammerbrookstr. 93                              20097 Hamburg / Germany

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Subject: strtr(),get_html_translation_table(),array_flip() - or "how to
 reverse htmlspecialchars()/htmlenities()"
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hi,
just committed some useful stuff to PHP 4 cvs: (maybe some of the doc-guys
feels strong enmoght to write the docs for it?)

strtr() can now be called with only 2 arguments. if called with just 2
args it behaves in a new way: arg2 then has to be an array that contains
string->string pairs that will be replaces in the source-string. strtr
will always look for the longest possible match 1st and will *NOT* try to
replace in stuff that it has already worked on!

$trans = array("hallo" => "hi", "hi" => "hallo");
echo strtr("hi all, i said hallo",$trans)."\n";

will show: 
hallo all, i said hi

get_html_translation_table(int which) will return the translation tables
that php used internally for htmlspecialchars() and htmlentities(). there
are two new defines (HTML_ENTITIES, HTML_SPECIALCHARS) that allow you to
specify the table you want (this leaves us room for implemeting other that
8859-1 charsets;-)

so you can now write your own htmlentities() that works *exactly* like
the builtin one:

$trans = get_html_translation_table(HTML_ENTITIES);
$str = "Hallo & <Pallo> & k<FC><DF>chen";
$encoded = strtr($str,$trans);

$encoded will now be:
Hallo &amp; &lt;Pallo&gt; &amp; k&uuml;&szlig;chen

the cool "new" this is that using array_flip() you can change the
direction of the translation!

$trans = array_flip($trans);
$original = strtr($str,$trans);

and $original will be 
Hallo & <Pallo> & k<FC><DF>chen

again!

have fun,
tc


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