v4.3.1 released

I don't know why you can't use validation_show_error('email');

The following code works as before after you run validation.

PHP Code:

if ($validation->hasError('username')) {
    echo $validation->getError('username');
} 


If you have code like this,

PHP Code:

if (! $this->validate($rules)) {
    return redirect()->back()->withInput();
} 


you are redirected after the validation fails.
In the next request, validation never run.
So you no longer can use $validation->getError() or hasError().

That is, if you don't redirect after the validation fails,
you can use $validation->getError() or hasError().

ci-phpunit-test | CodeIgniter Testing Guide | CodeIgniter 3 to 4 Upgrade Helper

I don't know why you can't use validation_show_error('email');

The following code works as before after you run validation.

PHP Code:

if ($validation->hasError('username')) {
    echo $validation->getError('username');
} 


If you have code like this,

PHP Code:

if (! $this->validate($rules)) {
    return redirect()->back()->withInput();
} 


you are redirected after the validation fails.
In the next request, validation never run.
So you no longer can use $validation->getError() or hasError().

That is, if you don't redirect after the validation fails,
you can use $validation->getError() or hasError().

Ok thanks kenjis now everything is clearer to me.

But even to me it's a mystery that it doesn't work (it shows nothing):

PHP Code:

echo validation_show_error('email'); 


Instead this shows the error correctly:

PHP Code:

if (isset($errors['email']))
{
    echo $errors['email'];
} 


I don't know why you can't use validation_show_error('email');

The following code works as before after you run validation.

PHP Code:

if ($validation->hasError('username')) {
    echo $validation->getError('username');
} 


If you have code like this,

PHP Code:

if (! $this->validate($rules)) {
    return redirect()->back()->withInput();
} 


you are redirected after the validation fails.
In the next request, validation never run.
So you no longer can use $validation->getError() or hasError().

That is, if you don't redirect after the validation fails,
you can use $validation->getError() or hasError().

Ok thanks kenjis now everything is clearer to me.

But even to me it's a mystery that it doesn't work (it shows nothing):

PHP Code:

echo validation_show_error('email'); 


Instead this shows the error correctly:

PHP Code:

if (isset($errors['email']))
{
    echo $errors['email'];
} 


Ok I found my problem, it was due to my "single" custom templates specified in Config/Validation.php.

Thanks again kenjis, and sorry for boring you