code: public static function hash( $s ) {
  		$h = 5381;
  		$len = strlen( $s );
  		for ( $i = 0; $i < $len; $i++ ) {
  			$h5 = ( $h << 5 ) & 0xffffffff;
  			// Do a 32-bit sum
  			// Inlined here for speed
  			$sum = ( $h & 0x3fffffff ) + ( $h5 & 0x3fffffff );
  			$h =
  				(
  					( $sum & 0x40000000 ? 1 : 0 )
  					+ ( $h & 0x80000000 ? 2 : 0 )
  					+ ( $h & 0x40000000 ? 1 : 0 )
  					+ ( $h5 & 0x80000000 ? 2 : 0 )
  					+ ( $h5 & 0x40000000 ? 1 : 0 )
  				) << 30
  				| ( $sum & 0x3fffffff );
  			$h ^= ord( $s[$i] );
  			$h &= 0xffffffff;
  		}
  
  		return $h;
  	}
docs: The CDB hash function.
  
  @param string $s
  
  @return int