$this->product_sn
return
}
产生过程debug记录:
55b5a39365bdb365bdb
Array ( [0] => 3 [1] => 6 [2] => 5 [3] => b [4] => d [5] => b )
Array ( [0] => 51 [1] => 54 [2] => 53 [3] => 98 [4] => 100 [5] => 98 )
5154539810098
51545398
2015072739810098
该方法虽然是流行的方式,但是一样还是有存在极小重复几率的。