substr_compare Binary safe optionally case insensitive comparison of 2 strings from an offset, up to length characters intsubstr_compare stringmain_str stringstr intoffset intlength boolcase_insensitivity substr_compare compares main_str from position offset with str up to length characters. Returns < 0 if main_str from position offset is less than str, > 0 if it is greater than str, and 0 if they are equal. If length is equal or greater than length of main_str and length is set, substr_compare prints warning and returns &false;. If case_insensitivity is &true;, comparison is case insensitive. ]]>