最好在PHP中，

例如，

11011111 ==> 11111011

11011111 ==> 11111011

推荐答案

的直接的方法是执行8口罩，8旋转，和7加法：

The straight forward approach is to perform 8 masks, 8 rotates, and 7 additions:

$blah = $blah & 128 >> 7 + $blah & 64 >> 5 + $blah & 32 >> 3 + $blah & 16 >> 1 + $blah & 8 << 1 + $blah & 4 << 3 + $blah & 2 << 5 + $blah & 1 << 7;