Programming PHP, 3rd Edition

Name

substr_compare

Synopsis

int substr_compare(string first, string second, string
   offset[, int length[, bool case_insensitivity]])

Compares first, starting at the position offset, to second. If length is specified, a maximum of that many characters are compared. Finally, if case_insensitivity is specified and true, the comparison is case-insensitive. Returns a number less than 0 if the substring of first is less than second, 0 if they are equal, and a number greater than 0 if the substring of first is greater than second.