(PHP 4 >= 4.0.5, PHP 5)
strcoll — 基于区域设置的字符串比较
$str1
, string $str2
)注意该比较区分大小写。和 strcmp() 不同,该函数不是二进制安全的。
strcoll() 使用当前区域设置进行比较。如果当前区域为 C 或 POSIX,该函数等同于 strcmp() 。
str1
第一个字符串。
str2
第二个字符串。
如果 str1
小于
str2
返回 < 0;
如果 str1
大于 str2
返回 > 0;如果两者相等,返回 0。
版本 | 说明 |
---|---|
4.2.3 | 函数在 Win32 平台可用。 |
[#1] sakkarinlaohawisut15 at hotmail dot com [2003-03-22 11:31:14]
[#2] [2002-08-27 07:05:54]
Note that some platforms implement strcmp() and strcasecmp() according to the current locale when strings are not binary equal, so that strcmp() and strcoll() will return the same value! This depends on how the PHP strcmp() function is compiled (i.e. if it uses the platform specific strcmp() found in its standard library!).
In that case, the only difference between strcoll() and strcmp() is that strcoll() may return 0 for distinct strings(i.e. consider strings are equal) while strcmp() will differentiate them if they have distinct binary encoding! This typically occurs on Asian systems.
What you can be sure is that strcmp() will always differentiate strings that are encoded differently, but the relative order may still use the current locale setting for collation order!