if (!function_exists('is_callable')) {
      function is_callable($var,$syntax_only=false)
      {
          if ($syntax\_only)\; \{$/* from The Manual:
              * If the syntax_only argument is TRUE the function only verifies
              * that var might be a function or method. It will only reject simple
              * variables that are not strings, or an array that does not have a
              * valid structure to be used as a callback. The valid ones are
              * supposed to have only 2 entries, the first of which is an object
              * or a string, and the second a string
              */
              return (is_string(var) || (is_array(var) == 2 && is_string(end(var)) || is_object(reset($var)))));\; \}\; else\; \{\; if\; (is\_string($var))
              {
                  return function_exists($var);\; \}\; else\; if\; (is\_array($var) && count(method = end($var)))\; \{$obj = reset($var);\; if\; (is\_string($obj))
                  {
                      $methods\; =\; get\_class\_methods($obj);
                      return (bool)(is_array(method), $methods));\; \}\; else\; if\; (is\_object($obj))
                  {
                      return method_exists($obj,$method);
                  }
              }
              return false;
          }
      }
  }
  
  ?>