Question

How can I, from a text file, use explode() to take the 1st 2 items (using comma as the delimiter) in each line ?

---

Username check is working.
The email however isn’t.
The countEmail doesn’t change.

This is the output I get:
(Tried to add an existing email and the countEmail didn’t change)

array(3) {    <--- Previous user
  [0]=>
  string(11) "blabla123"
  [1]=>
  string(28) " [e-mail]"
  [2]=>
  string(11) " 123, 1990
"
}
array(1) {
  [0]=>
  string(1) "
"
}

Notice: Undefined offset: 1 in C:\xampp\htdocs\Brets\register.php on line 35

Notice: Undefined offset: 1 in C:\xampp\htdocs\Brets\register.php on line 36
00 (countUser and countEmail)

And this is the code I use:

<form action="register.php" method="POST">
    Username: <br> <input type="text" name="username"> <br>
    Password: <br> <input type="password" name="password"> <br>
    Email: <br> <input type="text" name="email"> <br>
    Year of Birth: <br> <select name="year">
                            <option value="1990">1990</option>
                            <option value="1991">1991</option>
                            <option value="1992">1992</option>
                            <option value="1993">1993</option>
                        </select> <br>
    <input type="submit" value="Submit">
</form>

<?php
$next = 'register.php';
$greet = 'Welcome! <p>Please register using the form above.</p>';

if (isset($_POST['username']) && isset($_POST['password']) && isset($_POST['email']) && isset($_POST['year'])) {
    $username = htmlentities($_POST['username']);
    $password = htmlentities($_POST['password']);
    $email = htmlentities($_POST['email']);
    $year = htmlentities($_POST['year']);

    if (!empty($username) && !empty($password) && !empty($email) && !empty($year)) {
        $countEmail = 0;
        $countUser = 0;
        $filename = 'user.txt';
        $handle = fopen($filename, "a+");
        if ($handle) {
            while (($line = fgets($handle, filesize($filename))) !== false) {
                $line=explode(',', $line, 3);
                echo '<pre>';
                var_dump($line);
                echo '</pre>';
                if (($line[0] == $email) || ($line[1] == $email)) { $countEmail++; }
                if (($line[0] == $username) || ($line[1] == $username)) { $countUser++; }
            }
            if (!feof($handle)) {
                echo "Error: unexpected fgets() fail\n";
            }
        }
        if ($countEmail == 0 && $countUser == 0) {
            fwrite($handle, "$username, $email, $password, $year\r\n");
            fclose($handle);
            $greet = 'Thank you!';
        }
        if ($countEmail != 0) {$greet = 'An account with that email aready exists.';}
        if ($countEmail != 0) {$greet = 'Username already taken.';}
    } else { $greet = 'Fill in all fields.';}
}
echo $greet;

?>

I apologize if I sound confusing.
Also, I know there are probably much better ways of doing this, but I just started learning php 🙂

Answer 1

The php function fgets will read in the file line by line, allowing you to then process and do explodes on a line by line basis.

From the manual:

<?php
$handle = @fopen($filename, "r");
if ($handle) {
    while (($line = fgets($handle, 4096)) !== false) {
        // do something with $line here
    }
    if (!feof($handle)) {
        echo "Error: unexpected fgets() fail\n";
    }
    fclose($handle);
}
?>