php strip out special characters

function clean($string) {
   $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.

   return preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
}

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Phoenix Logan 186125 points

                                    phpCopy&lt;?php
$mainstr = &quot;&lt;h2&gt;Welcome to &lt;b&gt;PHPWorld&lt;/b&gt;&lt;/h2&gt;&quot;;

echo &quot;Text before remove: \n&quot; . $mainstr;

echo &quot;\n\nText after remove: \n&quot; .
    str_ireplace(array('&lt;b&gt;', '&lt;/b&gt;', '&lt;h2&gt;', '&lt;/h2&gt;'), '',
    htmlspecialchars($mainstr));
?&gt;

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