php代码
/*这个方法,右移的次数至少大于1。一般来说,0右移 没有什么意义。*/
(($a >> 1) & 0x7fffffff) >> ($n -1) //这里$n 是右移的次数。 $n >= 1
/*比如,实现md5加密,一般来说要用到下面的函数,在PHP中可以这样实现:*/
function RotateLeft($a, $n)
{
return ($a << $n) | ((($a >> 1) & 0x7fffffff) >> (31 - $n)); //注意运算符的优先级
}
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