如何实现PHP的TEA算法？

上面的是TEA的算法，XTEA的算法为：

那PHP中只需要把运算的位置改下就OK

    private function _teaencipherLong($y, $z, &$w, &$k) {
        $sum = ( integer ) 0;
        $delta = 0x9E3779B9;
        $n = ( integer ) $this->n_iter;
       
        while ( $n -- > 0 ) {
            $y = $this->_add ( $y, $this->_add ( $z << 4 ^ $this->_rshift ( $z, 5 ), $z ) ^ $this->_add ( $sum, $k [$sum & 3] ) );
            $sum = $this->_add ( $sum, $delta );
            $z = $this->_add ( $z, $this->_add ( $y << 4 ^ $this->_rshift ( $y, 5 ), $y ) ^ $this->_add ( $sum, $k [$this->_rshift ( $sum, 11 ) & 3] ) );
        }
       
        $w [0] = $y;
        $w [1] = $z;
    }   
    private function _decipherLong($y, $z, &$w, &$k) {
        // sum = delta<<5, in general sum = delta * n
        $sum = 0xC6EF3720;
        $delta = 0x9E3779B9;
        $n = ( integer ) $this->n_iter;
       
        while ( $n -- > 0 ) {
            $z = $this->_add ( $z, - ($this->_add ( $y << 4 ^ $this->_rshift ( $y, 5 ), $y ) ^ $this->_add ( $sum, $k [$this->_rshift ( $sum, 11 ) & 3] )) );
            $sum = $this->_add ( $sum, - $delta );
            $y = $this->_add ( $y, - ($this->_add ( $z << 4 ^ $this->_rshift ( $z, 5 ), $z ) ^ $this->_add ( $sum, $k [$sum & 3] )) );
        }
       
        $w [0] = $y;
        $w [1] = $z;
    }

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