... Next . PHP 4 >= 4.0.5) strcoll -- Locale based string comparison . int strcoll ( string str1, string str2) . Returns < 0 if str1 is less than str2 ; > 0 if str1 is greater than str2 , and 0 if they are equal. strcoll() uses the current locale for doing the comparisons. If the current locale is C or POSIX, this function is equivalent to strcmp() . Note that this comparison is case sensitive, and unlike strcmp() this function is not binary safe. ... strcmp . ...