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function hook_write_update_before_content($board, $wr_id, $w, $qstr) {
    $write_min = (int)$board['bo_write_min'];
    $write_max = (int)$board['bo_write_max'];

 

    if ($write_min == 0 && $write_max == 0) {
        return;
    }   

 

    $wr_content = isset($_POST['wr_content']) == true ? $_POST['wr_content'] : ''; 
    $wr_content = strip_tags($wr_content);
    $wr_content_len = 0;

 

    if (function_exists('mb_strlen') == true) {
        $wr_content_len = mb_strlen($wr_content);
    } else {
        $wr_content_len = strlen($wr_content);
    }   

 

    if ($write_min > 0 && $write_min > $wr_content_len) {
        alert($write_min . ' > ' . $wr_content_len);
    }   
    if ($write_max > 0 && $write_max < $wr_content_len) {
        alert($write_max . ' < ' . $wr_content_len);
    }   
}
add_event('write_update_before', 'hook_write_update_before_content', G5_HOOK_DEFAULT_PRIORITY, 4);