Encoding issue, coverting & to & for html using php

I have a url in html:

<a href="index.php?q=event&amp;id=56&amp;date=128">

I need to turn it into a string exactly as:

<a href="index.php?q=event&id=56&date=128">

I know how to do this with preg_replace etc, but is there a function in php that deals directly with encoding that I can use for other encoding issues such as &nsbp (or whatever it is, etc)? Ideally I would send my string into the function and it would output '&' instead of &amp. Is there a universal function for converting &开发者_StackOverflow中文版TEXT; into an actual character?

Edit: sorry, posted this before I finished typing the question. QUESTION is now complete.

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use html_entity_decode():

$newUrl = html_entity_decode('<a href="index.php?q=event&amp;id=56&amp;date=128">');
echo $newUrl; // prints <a href="index.php?q=event&id=56&date=128">

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Use htmlspecialchars_decode. Example straight from the PHP documentation page:

$str = '<p>this -&gt; &quot;</p>';
echo htmlspecialchars_decode($str); // <p>this -> "</p>

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There is no built in PHP function that will take an entity such as & and turn it into a double &. Just in case there is any confusion, the html entity for & is actually &, not amp;, so running any built in parser on your example will return the following:

<a href="index.php?q=event&id=56&date=128">

and not

<a href="index.php?q=event&&id=56&&date=128">

In order to get the double & version, you will need to use a regular expression.

Alternatively, if you in fact want the single & version, you have two possibilities.

1. If you just wish to convert & " ' < > then you should use htmlspecialchars_decode. This would be sufficient for the example you give.
2. If you wish to convert any string of the format &TEXT; then you should use html-entity-decode.

I suspect that htmlspecialchars_decode will be faster than html_entity_decode so if it covers all the entities you wish to convert, you should use that.

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after string go through TinyMCE only this code help me

$string = iconv('UTF-8','cp1251',$string);
$string = str_replace(chr(160), chr(32), $string);
$string = iconv('cp1251','UTF-8',$string);