How to prevent insert if email exist
if (isset($_REQUEST['btn_import']))
{
$filename = 'Database.csv';
$fp = fopen($filename, "r");
while (($row = fgetcsv($fp, "40", ",")) != FALSE)
{
$sql = "INSERT INTO excel (name,email,phone_no) VALUES('" . implode("','", $row) . "')";
if (!$conn->query($sql))
{
echo '<br>Data No Insert<br>';
}
}
fclose($fp);
}
ps. this code its from stackoverflow