composer require mews/purifier

'providers' => [
 // ...
 Mews\Purifier\PurifierServiceProvider::class,
]
然后在aliases中注册Purifier门面：
'aliases' => [
 // ...
 'Purifier' => Mews\Purifier\Facades\Purifier::class,
]

php artisan vendor:publish

return [
 'encoding' => 'UTF-8',
 'finalize' => true,
 'preload' => false,
 'cachePath' => null,
 'settings' => [
  'default' => [
   'HTML.Doctype'    => 'XHTML 1.0 Strict',
   'HTML.Allowed'    => 'div,b,strong,i,em,a[href|title],ul,ol,li,p[style],br,span[style],img[width|height|alt|src]',
   'CSS.AllowedProperties' => 'font,font-size,font-weight,font-style,font-family,text-decoration,padding-left,color,background-color,text-align',
   'AutoFormat.AutoParagraph' => true,
   'AutoFormat.RemoveEmpty' => true
  ],
  'test' => [
   'Attr.EnableID' => true
  ],
  "youtube" => [
   "HTML.SafeIframe" => 'true',
   "URI.SafeIframeRegexp" => "%^(http://|https://|//)(www.youtube.com/embed/|player.vimeo.com/video/)%",
  ],
 ],
];

clean(Input::get('inputname'));

Purifier::clean(Input::get('inputname'));

clean('This is my H1 title', 'titles');
clean('This is my H1 title', array('Attr.EnableID' => true));

Purifier::clean('This is my H1 title', 'titles');
Purifier::clean('This is my H1 title', array('Attr.EnableID' => true));

<?PHP
function clean_xss(&$string, $low = False)
{
 if (! is_array ( $string ))
 {
 $string = trim ( $string );
 $string = strip_tags ( $string );
 $string = htmlspecialchars ( $string );
 if ($low)
 {
 return True;
 }
 $string = str_replace ( array ('"', "\\", "'", "/", "..", "../", "./", "//" ), '', $string );
 $no = '/%0[0-8bcef]/';
 $string = preg_replace ( $no, '', $string );
 $no = '/%1[0-9a-f]/';
 $string = preg_replace ( $no, '', $string );
 $no = '/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]+/S';
 $string = preg_replace ( $no, '', $string );
 return True;
 }
 $keys = array_keys ( $string );
 foreach ( $keys as $key )
 {
 clean_xss ( $string [$key] );
 }
}
//just a test
$str = 'jb51.net<meta http-equiv="refresh" content="0;">';
clean_xss($str); //如果你把这个注释掉，你就知道xss攻击的厉害了
echo $str;
?>