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Editorial Team
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Asked: 2026-06-01T22:25:24+00:00

This is my form: <!DOCTYPE html> <html> <head> </head> <body> <form action=register_ajax.php method=get> <input

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This is my form:

<!DOCTYPE html>
<html>
  <head>
  </head>
  <body>
    <form action="register_ajax.php" method="get">
    <input type="text" name="email">
    <input type="submit" value="test">
    </form>
  </body>
</html>

This is my php code:

<?php
    $dbc = mysqli_connect("localhost","root","*******","continental_tourism") OR die(mysqli_connect_error());
    $email = $_GET['email'];
    $query = "SELECT email FROM customer_info WHERE email = '$email' ";
    $r = mysqli_query($dbc, $query) OR die(mysqli_error($dbc));
    if($r)
        echo "Email address exists!";
    else
        echo "sss";
?>

If I enter a correct(Existing email on db) $r is true. But if I enter non existing email, then also $r is true. Why is that? Basically I want to detect the empty set. How can I do it?

Thanks!

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1 Answer

  1. Editorial Team

    $r will only be false if there was SQL error. Otherwise it will always return an object, even if no rows are returned by your SELECT statement.

    Use mysqli_num_rows() to count how many rows are returned. Zero means no one is using that email address.

    if(mysqli_num_rows($r))
    echo "Email address exists!";
else
    echo "sss";
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