Minimum Characters Per Post

I saw this hackmod from phpbb com. Users must type at least a number of characters before submitting new post.

Code:

    #
    #-----[ OPEN ]-----------------------
    #
    includes/message_parser.php
    #
    #-----[ FIND ]------------------------
    #
          // Check for "empty" message
          if ($mode !== 'sig' && !utf8_clean_string($this->message))
          {
            $this->warn_msg[] = $user->lang['TOO_FEW_CHARS'];
            return $this->warn_msg;
          }
    #
    #-----[ AFTER, ADD ]----------------
    #
          // Check for character limit
          if ($mode !== 'sig' && strlen(utf8_clean_string($this->message)) < 30)
          {
            $this->warn_msg[] = $user->lang['TOO_FEW_CHARS_POST'];
            return $this->warn_msg;
          }
    #
    #-----[ OPEN ]-----------------------
    #
    language/en/posting.php
    #
    #-----[ FIND ]------------------------
    #
      'TOO_FEW_CHARS'            => 'Your message contains too few characters.',
    #
    #-----[ AFTER, ADD ]----------------
    #
      'TOO_FEW_CHARS_POST'      => 'Your message contains too few characters. The message must be at least 30 characters length.',

Its been suggested here.
https://help.forumotion.com/t89869-allow-to-make-minimum-characters-for-posts#578071

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