strnatcasecmp Case insensitive string comparisons using a "natural order" algorithm intstrnatcasecmp stringstr1 stringstr2 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 information 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 preg_match, strcasecmp, substr, stristr, strcmp, strncmp, strncasecmp, strnatcmp, and strstr.