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     # Function for stripping out malicious bits
      <?php
      function cleanInput($input) {
       
        $search = array(
          '@<script[^>]*?>.*?</script>@si',   // Strip out javascript
          '@<[\\/\\!]*?[^<>]*?>@si',            // Strip out HTML tags
          '@<style[^>]*?>.*?</style>@siU',    // Strip style tags properly
          '@<![\\s\\S]*?--[ \\t\\n\\r]*>@'         // Strip multi-line comments
        );
       
          $output = preg_replace($search, '', $input);
          return $output;
        }
      ?>
        
        # The Sanitization function
        <?php
      function sanitize($input) {
          if (is_array($input)) {
              foreach($input as $var=>$val) {
                  $output[$var] = sanitize($val);
              }
          }
          else {
              if (get_magic_quotes_gpc()) {
                  $input = stripslashes($input);
              }
              $input  = cleanInput($input);
              $output = mysql_real_escape_string($input);
          }
          return $output;
      }
      ?>
        ### Usage
        <?php
        $bad_string = "Hi! <script src='http://www.evilsite.com/bad_script.js'></script> It's a good day!";
        $good_string = sanitize($bad_string);
        // $good_string returns "Hi! It\\'s a good day!"
      
        // Also use for getting POST/GET variables
        $_POST = sanitize($_POST);
        $_GET  = sanitize($_GET);
      ?>