How PHP removes white space characters submitted by the editor

How PHP removes the blank characters that are submitted by the editor
Just like this white-space character:

HTML Code

  
  <p>&nbsp;&nbsp;&nbsp; </p>

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Reverting to an entity is like this:

, and then replace
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The last answer was wrong and was misled by the so-called:

PHP Code

$str = ' <p>&nbsp;&nbsp;&nbsp; </p> '; $result = Htmlspecialchars_decode ($STR);
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Reference:
   
   

   
   
The last answer was wrong and was misled by the so-called:
   
   

   
   
PHP Code
   
   

   
   
$str = ' &amp;lt;p&amp;gt;&amp;amp;nbsp;&amp;amp;nbsp;&amp;amp;nbsp; &amp;lt;/p&amp;gt; ';
   
   
$result = Htmlspecialchars_dec ...
   
   

  
  
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