在PHP中，为什么字符串“1874S-O.jpg”不大于“1874S.jpg”？

Question

I was attempting to sort some strings in an array alphabetically. The strings were file names I grabbed from a directory using glob. At first, I thought glob was incorrectly sorting the file names. I tried sort, and the same thing happened: 1874S-O.jpg came before 1874S.jpg

Finally, I compared them with

var_dump("11-09-2016/1874S/1874S-O.jpg" > "11-09-2016/1874S/1874S.jpg");

which returned bool(false). Any ideas why the longer string would not be greater than the shorter string and would also not come after the shorter string alphabetically?

Answer 1

Because . is greater than -.

Those are the first non-equal characters in your strings.