This API is part of the Hack Standard Library, not HHVM itself.
Facebook Engineer?

This function is available as Str\pad_right() in Facebook's www repository.

Returns the string padded to the total length by appending the $pad_string to the right


namespace HH\Lib\Str;

function pad_right(
  string $string,
  int $total_length,
  string $pad_string = ' ',
): string;

If the length of the input string plus the pad string exceeds the total length, the pad string will be truncated. If the total length is less than or equal to the length of the input string, no padding will occur.

To pad the string on the left, see Str\pad_left().


  • string $string
  • int $total_length
  • string $pad_string = ' '