alert duplicate records in csv upload - php

Question

my csv upload code is like this want to alert duplicate records which are already exists in database i am getting result with $status variable what should i do to alert every duplicate records what is way to alert every duplicate records
if(isset($_POST["Import"]))
{
$filename=$_FILES["file"]["tmp_name"];
if($_FILES["file"]["size"] > 0)
{
$row = 1;
if (($handle = fopen("$filename", "r")) !== FALSE)
{
while (($data = fgetcsv($handle)) !== FALSE)
{
$num = count($data);
$row++;
for ($c=0; $c < $num; $c++) {
if($c!="" && $c+1!="" && $c+2!=""){
$a[] = $data[$c];
}
}
}
$total = count($a);
$m=0;
$k = 1;
for ($c=0; $c < $total; $c++)
{
$address[$m][] = $a[$c] ;
$z = $address[$m][0];
$q = $address[$m][1];
$q .= $address[$m][2];
$q .= $address[$m][3];
$q .= $address[$m][4];
$q .= $address[$m][5];
$q .= $address[$m][6];
$q .= $address[$m][7];
$q .= $address[$m][8];
$q .= $address[$m][9];
if($a[$c]=="")
{
if($k!=1)
{
$selectcon = "SELECT user_id FROM contact
WHERE user_id = '".$z."'";
$selectRes = mysql_query($selectcon);
if($rows = mysql_fetch_array($selectRes))
{
$user_id = $rows['user_id'];
if($user_id == $z)
{
$staus = 1;
}
else
{
$staus = 1;
}
}
$insertParty = "INSERT INTO contact(user_id)values('$z')";
$res = mysql_query($insertParty);
$contact_id = mysql_insert_id();
$insertAddress = "INSERT INTO address(contact_id,address)VALUES($contact_id,'$q')";
$insertAddressRes = mysql_query($insertAddress);
if(!$insertAddressRes)
{
echo "<sctipt>";
echo "sweetAlert('oops','Import Data Fail','error')";
echo "</sctipt>";
}
else
{
echo "<script>";
echo "swal('Sucess!', 'File Imported Sucessfully!','success')";
echo "</script>";
}
$m++;
}
$k++;
}
}
fclose($handle);
}
}
}
?>

Answer 1

You need to make a unique row inside database. You can't do it with PHP.
Add all columns to a single UNIQUE index, the you can't insert duplicate rows in that table.