(PHP 4 = 4.0.2)
This function is similar to
strcasecmp(), with the difference that you can
specify the (upper limit of the) number of characters (len) from each string to be
used in the comparison. If any of the strings is shorter than
len, then the length of
that string will be used for the comparison.
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(), strcmp(), substr(),
stristr(), and strstr().