php - Find alphabetically first value using PHP

Question

I am writing a sort function (using usort), and part of the operation I want to do there is determining which value comes first alphabetically. (This is only part of the operation, hence I'm not using natsort.) This means I have two strings for which I need to determine which is alphabetically first. Since this operation gets done in a loop, I want to have this done as simple as possible. One thing I could do is construct an array out of the two elements and use natsort on that. Is there a better approach, that does not involve constructing an array from the two values?

Edit: $a > $b seems to get basic cases right, though I'm not sure of how correct this behaves.

Answer 1

用于strcmp：

从文档中：

如果 str1 小于 str2，则返回 < 0；> 0 如果 str1 大于 str2，如果它们相等则为 0。

代码：

$str1 = 'foo';
$str2 = 'bar';

if(strcmp($str1, $str2) < 0) {
  echo '$str1 comes first';
} elseif(strcmp($str1, $str2) > 0 ){
  echo '$str2 comes first';
} 

输出：

$str2 comes first

演示！