SYNOPSIS
        int strstr (string str, string str2, int pos)

DESCRIPTION
        Returns the index of str2 in str searching from position pos.
        If str2 is not found in str, -1 is returned. The returned
        index is relativ to the beginning of the string.

        If pos is negativ, it designates the start position relative
        to the end of the string.

SEE ALSO
        strlen(E), sscanf(E), sprintf(E), explode(E)