Question

Can somebody help me in converting the following code written using if-else to try/catch. Also let me know is trycatch needed in this case or if-else is apt

$results = mysql_query($query);
if(mysql_num_rows($results)!=0)
{
    while(($result = mysql_fetch_row($results))!=FALSE)
    {
        $res   ="DELETE FROM table1 WHERE id ='".$result['id']."'";
        if(mysql_query($res)==false)
        {
            echo mysql_error();
            exit;
        }
    }
    echo $res   ="DELETE FROM table2 WHERE id ='".$id."'";
    if(mysql_query($res)!==false)
    {
        header("Location:list.php?m=4");
    }
    else
    {
        echo mysql_error();
        exit;
    }
}
else
{
    echo "Error";
}

Answer 1

from the sound of it, it seems you think try/catch and if-else as the same behaviour. That is not the case. Try catch is used to prevent an exception from making the application crash or to handle exceptions gracefully, and to perform logging and giving user feedback. If-else (else if) is used to check the internal state of your application, and perform different actions accordingly.

Generally, a try-catch is less efficient than if there is a switch-case or else-if approach to the problem.