how do you prevent the entry of duplicate records in php mysql? validating input before insertion to the table.
i am currently building a user registration section for my website but want to present them with an error if a duplicate username or email address is found in the database.
EDIT
This is what I have to far to insert rows... how would I implement both these answers here:
<?php
if (array_key_exists('confirm',$_POST)) {
$Cuser = $_POST['Cuser'];
$Cemail = $_POST['Cemail'];
$Cpassword = $_POST['Cpassword'];
$md5password = md5($_POST['Cpassword']);
mysql_query("INSERT INTO tbl_users (`username`,`email`,`password`)
VALUES ('$Cuser', '$Cemail', '$md5password')");
echo "Thank you. The user <b>".$Cuser." (".$Cemail.")</b> has been successfully added to the database.<p>
<a href='myaccount.php' class='form'>Return</a>";
exit;
}
?>
I'm guessing that I could implement it all in an if...else statement?
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