write.skin.php에서
                <input type="checkbox" name="wr_1[]" value="1"  <?=$write['wr_1']&1?'checked':''?> />대추<br>
                <input type="checkbox" name="wr_1[]" value="2"  <?=$write['wr_1']&2?'checked':''?> />밤<br>
                <input type="checkbox" name="wr_1[]" value="4"  <?=$write['wr_1']&4?'checked':''?> />배<br>
                <input type="checkbox" name="wr_1[]" value="8"  <?=$write['wr_1']&8?'checked':''?> />사과<br>
                <input type="checkbox" name="wr_1[]" value="16" <?=$write['wr_1']&16?'checked':''?> /><br>
write_update.skin.php
또는
write_update.tail.skin.php
에서

if( is_array( $wr_1)
    $wr_1_val= array_sum( $wr_1);
else
    $wr_1_val= 0;

sql_query( "update $write_table set wr_1='$wr_1_val' where wr_id='$wr_id' ");