How is 618 sales champion made?Uncover the secret of e-commerce’s “invigorating” hundreds of millions of sales data>>> 
solutions to the problem of ‘fopen’: this function or variable may be unsafe
Reference article:
(1) How to solve the problem of “fopen”: this function or variable may be unsafe
（2） https://www.cnblogs.com/hnzsb-vv1130/p/6592938.html
Let’s make a note.
How is 618 sales champion made?Uncover the secret of e-commerce’s “invigorating” hundreds of millions of sales data>>> 
solutions to the problem of ‘fopen’: this function or variable may be unsafe
Reference article:
(1) How to solve the problem of “fopen”: this function or variable may be unsafe
（2） https://www.cnblogs.com/hnzsb-vv1130/p/6592938.html
Let’s make a note.