php - If username is set and password is not, display me an error message

    <div class="form">
<h1>Log In</h1>
<form action="" method="post" name="login">
<input type="text" name="username" placeholder="username" required />
<input type="password" name="password" placeholder="password" required />
<input name="submit" type="submit" value="Login" />

      if (isset($_POST['username']) && !isset($_POST['password']))  {
    echo "Please enter your password.";

I just want to display an error message IF username IS set and password field is not filled with any character after click on "submit", this is how I tried but now working for me.




In your form you are missing an action. Inside the action attribute put the same URL that you did below. Also, you should check if the submitPOST is set.

if (isset($_POST['submit']) && isset($_POST['username']) && $_POST['password'] == "")  {
    echo "Please enter your password.";



if (isset($_POST['username']) && ($_POST['password'] == ""))  {
    echo "Please enter your password.";



Below your form enter the following:

if ((isset($_POST['username'])) == true && (isset($_POST['password'])) == false ){
   echo "please enter your password";

This means that if the username is set and the password is NOT set it will display the error message of: "please enter you password". You can change this and use it as a template:

if ((isset($_POST['value'])) == true && (isset($_POST['value2'])) == false{
   echo "error message!";

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