php - Html injection in my site -

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well, have big problem: day inserting html code in index.php , don't know how, code inserted:

<iframe src=**bad url here** width=0 height=0 frameborder=0></iframe>

i tried prevent problem:

$_get = sanitize::filter($_get); $_post = sanitize::filter($_post)

my sanitize class filter content in $_get , $_post problem continue.

this sanitize file:

abstract class sanitize {  /**  * filter  *   * @param  mixed $value  * @param  array $modes  * @return mixed  * @static  * @since  1.0  */     static public function filter($value, $modes = array('sql', 'html')) {          if (!is_array($modes)) {             $modes = array($modes);         }          if (is_string($value)) {             foreach ($modes $type) {               $value = self::_dofilter($value, $type);             }             return $value;         }          foreach ($value $key => $tosanatize) {             if (is_array($tosanatize)) {                 $value[$key]= self::filter($tosanatize, $modes);             } else {                 foreach ($modes $type) {                   $value[$key] = self::_dofilter($tosanatize, $type);                 }             }         }          return $value;     }  /**  * dofilter  *   * @param  mixed $value  * @param  array $modes  * @return mixed  * @static  * @since  1.0  */     static protected function _dofilter($value, $mode) {          switch ($mode) {             case 'html':                 $value = strip_tags($value);                 $value = addslashes($value);                 $value = htmlspecialchars($value);                 break;              case 'sql':                 $value = preg_replace(sql_regcase('/(from|select|insert|delete|where|drop table|show tables|#|\*| |\\\\)/'),'',$value);                 $value = trim($value);                 break;         }          return $value;     }  }

and files inserted in public_html folder , don't know how.


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