<?php
/**
	 * Decode a string with URL-safe Base64.
	 *
	 * @param string $input A Base64 encoded string
	 *
	 * @return string A decoded string
	 */
	public static function urlsafeB64Decode( $input ) {
		$remainder = strlen( $input ) % 4;
		if ( $remainder ) {
			$padlen = 4 - $remainder;
			$input  .= str_repeat( '=', $padlen );
		}

		return base64_decode( strtr( $input, '-_', '+/' ) );
	}
  ?>