WordPress版本如何使用str_starts_with和str_ends_with函数

if ( ! function_exists( 'str_starts_with' ) ) {
  function str_starts_with( $haystack, $needle ) {
    if ( '' === $needle ) {
      return true;
    }

    return 0 === strpos( $haystack, $needle );
  }
}

if ( ! function_exists( 'str_ends_with' ) ) {
  function str_ends_with( $haystack, $needle ) {
    if ( '' === $haystack && '' !== $needle ) {
      return false;
    }

    $len = strlen( $needle );

    return 0 === substr_compare( $haystack, $needle, -$len, $len );
  }
}