Yes, there is a simple way for registration and login,
First we have to check submit button is pressed or not like-
Step 1 -
if(isset($_REQUEST[''submit']) ){
your code ...
}
Step 2 - check the field data
if(isset($_REQUEST['name']) && !empty($_REQUEST['name'])) ){
put your logic accoriding to you ...
}
if(isset($_REQUEST['email']) && !empty($_REQUEST['email'])) ){
put your logic accoriding to you ...
}
you can check combine both of field like
if(!empty($_REQUEST['name']) && !empty($_REQUEST['email'])) ){
put your logic accoriding to you ...
}
For more informtion checkout this link ShortTutorials