Question

I am trying to use PHP to update column data but I am receiving a division by zero error.

mysql_query('UPDATE personas SET toolbar_id=\'' . $result . '\' WHERE download_ff LIKE concat('%',\'' . $result . '\','%')');
    echo mysql_error($link);
    printf("Records inserted: %d\n", mysql_affected_rows());

Ive tried a few ways to concat the $result but it is all resulting in a division by zero error. Help!

Answer 1

Your problem is right here:

concat('%',\'' . $result . '\','%')

The % ends out outside the string so PHP is interpreting it as a modulus operation and the strings on both sides of the modulus will be zeros in a numeric context, the result is that you’re trying to 0 % 0 and you get your “division by zero” error.

Try escaping the inner single quotes:

concat(\'%\',\'' . $result . '\',\'%\')

Or, create a $like_result in your PHP that includes the percent signs in the string and then do this:

mysql_query('UPDATE personas SET toolbar_id=\'' . $result . '\' WHERE download_ff LIKE \'' . $like_result . '\';

You are using mysql_real_escape_string too, right?