original_string: private function debugCallable($fn)
      {
          if (is_string($fn)) {
              return "callable({$fn})";
          }
  
          if (is_array($fn)) {
              return is_string($fn[0])
                  ? "callable({$fn[0]}::{$fn[1]})"
                  : "callable(['" . get_class($fn[0]) . "', '{$fn[1]}'])";
          }
  
          return 'callable(' . spl_object_hash($fn) . ')';
      }
code: private function debugCallable($fn)
      {
          if (is_string($fn)) {
              return "callable({$fn})";
          }
  
          if (is_array($fn)) {
              return is_string($fn[0])
                  ? "callable({$fn[0]}::{$fn[1]})"
                  : "callable(['" . get_class($fn[0]) . "', '{$fn[1]}'])";
          }
  
          return 'callable(' . spl_object_hash($fn) . ')';
      }
code_tokens: private function debugCallable ( $ fn ) { if ( is_string ( $ fn ) ) { return "callable({$fn})" ; } if ( is_array ( $ fn ) ) { return is_string ( $ fn [ 0 ] ) ? "callable({$fn[0]}::{$fn[1]})" : "callable(['" . get_class ( $ fn [ 0 ] ) . "', '{$fn[1]}'])" ; } return 'callable(' . spl_object_hash ( $ fn ) . ')' ; }
docstring: Provides a debug string for a given callable.
  
  @param array|callable $fn Function to write as a string.
  
  @return string
docstring_tokens: Provides a debug string for a given callable .