(PHP 5 >= 5.1.0, PHP 7)
htmlspecialchars_decode — Convert special HTML entities back to characters
$string
   [, int $flags = ENT_COMPAT | ENT_HTML401
  ] ) : stringThis function is the opposite of htmlspecialchars(). It converts special HTML entities back to characters.
   The converted entities are: &,
   " (when ENT_NOQUOTES is not set),
   ' (when ENT_QUOTES is set),
   < and >.
  
stringThe string to decode.
flagsA bitmask of one or more of the following flags, which specify how to handle quotes and which document type to use. The default is ENT_COMPAT | ENT_HTML401.
| Constant Name | Description | 
|---|---|
ENT_COMPAT | 
           Will convert double-quotes and leave single-quotes alone. | 
ENT_QUOTES | 
           Will convert both double and single quotes. | 
ENT_NOQUOTES | 
           Will leave both double and single quotes unconverted. | 
ENT_HTML401 | 
           Handle code as HTML 4.01. | 
ENT_XML1 | 
           Handle code as XML 1. | 
ENT_XHTML | 
           Handle code as XHTML. | 
ENT_HTML5 | 
           Handle code as HTML 5. | 
Returns the decoded string.
| Version | Description | 
|---|---|
| 5.4.0 | 
        The constants ENT_HTML401, ENT_XML1,
        ENT_XHTML and ENT_HTML5 were added.
        | 
      
Example #1 A htmlspecialchars_decode() example
<?php
$str = "<p>this -> "</p>\n";
echo htmlspecialchars_decode($str);
// note that here the quotes aren't converted
echo htmlspecialchars_decode($str, ENT_NOQUOTES);
?>
The above example will output:
<p>this -> "</p> <p>this -> "</p>