checking fields of log in form

[phpbeginner]

My question is simple.

When a user types in a blank username or password, I want to say sorry, you must enter a username and a password in a different colour.

Can someone suggest how to do this. I thought I woiuld be able to find something quick online, but either everything seems too complicated or I just cannot find what I want.

[kovik]

That's simple enough for me to give a straight answer to.

<?php
if(!empty($_POST)) // Form has been submitted
{
    if(!isset($_POST['username'], $_POST['password']))
    {
        $error = "You must fill in all fields.";
    }
    else
    {
        // Submit and process the data
    }
}
?>
 
<form method="post" action="" >
    <input type="text" name="username" value="<?php
    echo isset($_POST['username']) ? $_POST['username'] : '';?> />
    <input type="password" name="password" value="<?php
    echo isset($_POST['password']) ? $_POST['password'] : '';?> />
    <input type="submit" value="Submit" />
</form>

That should do it. Inform me if there are any typos.


You just have to check each form field (which you should ALWAYS do anyway).