Validating variables

PHP
1

Hey,
I am going throguh a list of variables and making PHP validate each one using an if statement. How can I make PHP sort of stop and end the script if it comes accross an invalid variable?

2

Well say you have a function doing this, simply use the return command:

function validate(){
    if(){
       return false;
    }
}

Any code after that is ignored.

If you want to completely stop the script, use the exit command:

exit;
3

If I have a line like this when a validation fails:

$error_detail = "Cost is invalid";

How can I add another text string to that when another validation fails?

Is it as simple as writing something like:

$error_detail = $error_detail."Name is invalid";
4

You’d be better off with an array.

$Errors = array();
if(cost_is_invalid){
    $Errors[] = 'Cost is invalid';
}
if(name_is_invalid){
    $Errors[] = 'Name is invalid';
}
//....
if(empty($Errors)){
    //success
}else{
    //fail
}
5

Better use array to store multiple error messages:


$error = array();
if(empty($name)){
    $error[] = 'Name is blank.';
}
if(empty($email)){
    $error[] = 'Email is blank.';
}

Now you can store it in the session or handle in some ways to report the error messages in the page.

6

I have just tried:

				if (!empty($errors)) {
					echo "<ul>";
					foreach($errors as $error) {
						echo "<li>".$error."</li>";
					}
					echo "</ul>";
				} else {

but it says theres an error and I think it’s to do with the “!” but not quite sure how?

7

What’s the error? Nothing wrong with that except the else isn’t closed.

8

I have no idea why I got an error but I managed to fix it.

Thanks