There is logic that cannot be expressed in code...

Question

//举例
$a = [4,6,5,9,7,8,2,5,6,4,1,2,3,8,9];
$b = [3,7,5,9,7,8,2,5,8,4,1,2,3,8,0];

Randomly generates an array like $a and stores it in the 001.txt file.

Randomly generate an array and determine whether it exists in 001.txt. If it does not exist, store the array in the 001.txt file. If it exists, stop the program and return the last generated array

Answer 1

It's not difficult, think about it carefully