This function implements a comparison algorithm that
orders alphanumeric strings in the way a human being would.
The behaviour of this function is similar to
strnatcmp(), except that the comparison is not case
sensitive. For more infomation see: Martin Pool's Natural Order
String Comparison page.
Similar to other string comparison functions, this one
returns 0 if str1 is
less than str2; 0 if
str1 is greater than str2, and 0 if they are
equal.
See also ereg(),
strcasecmp(), substr(),
stristr(), strcmp(),
strncmp(),
strncasecmp(), strnatcmp(), and
strstr().