php sanitize an array with a given function -

i have simple sanitize function nests switch statement inside of foreach statement read somewhere bad practice, haven't been able come better solution, code follows, appreciated...

public static function db_sanitize($input, $santype = 'sql', $cleankeys = false) {     $type = strtoupper($santype);     if (!is_array($input)) {         $input = array($input);     }     foreach ($input $key => $value) {         switch ($type) {             case 'sql':                 if ($cleankeys) {                     $key = $this->_mysqli->escape_string($key);                 }                 $value = $this->_mysqli->escape_string($value);                 $clean[$key] = $value;                 break;             case 'html':                 if ($cleankeys) {                     $key = htmlentities($key);                 }                 $value = htmlentities($value);                 $clean[$key] = $value;                 break;             default:                 if ($cleankeys) {                     $key = $this->_mysqli->escape_string($key);                 }                 $value = $this->_mysqli->escape_string($value);                 $clean[$key] = $value;                 break;     }     return $clean; } 

public function db_sanitize($input, $context = 'sql', $cleankeys = false) {      $type = gettype($input);     $context = strtoupper($context);     if (!is_array($input)) {         $input = array($input);     }     switch($context) {         case 'sql':             $filter = array('options' => array($this->_mysqli, 'escape_string'));             break;         case 'html':             $filter = 'html_entities';             break;         default:             $filter = array('options' => array($this->_mysqli, 'escape_string'));             break;     }     foreach ($input $key => $value) {         if ($type == 'string') $strkey = $key;         if ($cleankeys && is_string($key)) {             $key = filter_var($key, filter_callback, $filter);         }         $value = filter_var($value, filter_callback, $filter);         $clean[$key] = $value;     }     if (isset($strkey)) return $clean[$strkey];     return $clean;  }