title: How to use a class's method inside a function (PHP)?
body: <p>I'm trying to use the new PHP mysqli extension. I've got a function (safe()) that recursively uses mysql_real_escape_string to make strings safe. How do I use my mysqli connection inside this function to call the mysqli::escape_string() function?</p>
  
  <p>Example:</p>
  
  <pre><code>$db = new mysqli($host,$user,$password,$database_name);
  
  
  function safe ($data) {
    if(!is_array($data)) {
       if(!get_magic_quotes_gpc()) {
         $data = **mysqli::escape_string($data)**
         return $data;
      }
    } else {
      return array_map('safe',$data);
    }
  }
  </code></pre>
  
  <p>Where I have <strong>mysqli::escape_string()</strong> inside safe() how do I call that? Outside of a function it would be $db->escape_string() but I can't find a way to call it insde. I've tried passing $db to the function, making $db global etc. The alternative is to use the procedural mysqli_escape_string() but that requires the mysqli link resource to be explicitly passed to it, but I can't find a way to access that.</p>