Code to limit user registration - hide/show form php [closed]

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I've just started to learn PHP - Not very good. I have created a form (see below) which I would like people to sign up to but I would like to limit this to a certain number of members. For example 4 users can sign up when it reaches that amount it will hide the form and display a message saying "sorry, you have reached the user account limit."

<form action="users.php?new=1" method="post">
    <input type="hidden" name="action" value="newUser"/>
    <input type="hidden" name="id" value="0"/>
<fieldset>
    <legend>Add new user</legend>

    <?php if(isset($msg)) { echo $msg;}?>

    <p>
        <label>Full name: </label>
        <input name="name"  value="<?php if(isset($name)) { echo $name;}?>" style="width:400px;"/>
    </p>

     <p>
        <label>Email: </label>
        <input name="email"  value="<?php if(isset($email)) { echo $email;}?>" style="width:400px;"/>
    </p>

     <p>
        <label>Password: </label>
        <input name="password" type="password"  value="" style="width:400px;"/>
    </p>
     <p>
        <label>Phone number: </label>
        <input name="phone"  value="<?php if(isset($phone)) { echo $phone;}?>" style="width:400px;"/>
    </p>

                    <p>

<label>User level:</label>
        <select name="access" class="dropdown">
            <option value="no" <?php if(isset($access)) { if ($access =='no'){ echo ' selected="selected" ';}}?>>User</option>
            <option value="yes" <?php if(isset($access)) { if ($access =='yes'){ echo ' selected="selected" ';}}?>>Admin</option>
         </select>

Note: Admin users will have full access to all areas.

Please can someone help me! Code would be lovely!

Thanks, Charlie

Answer 1

<?php        
    $connection=mysqli_connect("host", "username", "password", "database");
    $sql="SELECT COUNT(*) from database_users";
    $stmt = $connection->prepare($sql);
    $stmt->execute();
    $res = $stmt->get_result();
    $users = $res->fetch_array(MYSQLI_ASSOC);

    if ($users['COUNT(*)'] < 4) {
?>

    // html goes here, outside of the php tags

<?php
    } else {

        echo "Sorry, you have reached the user account limit.";

    };
?>

Answer 2

Using whatever database method you're using, you should take a look into the database and see how many results are returned. If there are 4 or more, then don't display the form, if not, then display it.

Seeing as you're new to PHP, the chances of your database language will be mysql_*, which is not very good, but unfortunately it's widespread across the internet.

Please look into PDO or mysqli_* if you haven't already.

If you're using mysqli:

<?php
    $con=mysqli_connect("host", "username", "password", "database");

    if (mysqli_connect_errno($con))
    {
        echo "Failed to connect: " . mysqli_connect_error();
    }

    $sql= "SELECT * FROM table";
    if ($result=mysqli_query($con,$sql){
        $rowcount = mysqli_num_rows($result);
    }

Then you can use $rowcount in an if to see if it is more than 4.

eg.

if ($rowcount > 4){
    echo "Sorry, no more users can sign up";
}else{
    //form here
}