How to deal with errors, warnings, alerts or notices with PHP. You cannot hard code them into a page because at times they wont be needed yet when they are how can they be shown in a simplistic manner?

Lets assume you submit a form and a field was filled in wrong or it had missing data, you can return the user to the page or another page but this time show an alert styled response on the issue/error, here is how.

A function that sorts and returns based on the int

function alert_system($id = 4)
{
    switch ($id) {
        case 1:
            return "

            This is a notice that ......
            
";
            break;
        case 2:
            return "

            This is a warning that ......
            
";
            break;
        case 3:
            return "

            This is an error notice that ......
            
";
            break;
        default:
            return "";
    }
}

1, 2 or 3 will return the alert html whilst 4 or higher returns nothing i.e no issue.

On our form submit page filter to the error and do a redirect with a GET like:

if (!is_numeric($age)){
    header("Location: somepage.php?notice=3");
    die();
}

Then the “somepage.php” has this code included (along with Bootstrap and the require_once(‘functions.php’);)

    

        

            
Page heading here
        
    
    

        

            
        
    
    

        

            
Content
        
        

            
Content
        
    

It will display the alert notice pending what the issue is. If the ?notice= isn’t set then nothing gets shown as per the function.