double data on mysql

Question

I use the php operator && to select multiple data so that there is no duplication on mysql. Does the code that I use below run fine? Is there a more simple use of PHP operators?

$date= date('Y/m/d');
$cekcount = mysql_num_rows(mysql_query("SELECT * FROM `pending_media` where `mediaid`='$dielz'"));
$cekcount2 = mysql_num_rows(mysql_query("SELECT * FROM `media` where `mediaid`='$dielz'"));
$selectcount = mysql_query("SELECT * FROM `media` where `date`='$date' AND `uplink`='$nam'");
$cekcount3 = mysql_num_rows($selectcount);
if($cekcount == 0 && $cekcount2 == 0 &&  $cekcount3 == 0){
mysql_query("INSERT INTO pending_media VALUES('','$nam','$dielz')");

Answer 1

Upgrade to mysqli, I'll recommend object-oriented syntax because it is nicer to work with.

In accordance with the best practice of "minimize calls to the database", I'll condense your three queries into a single, united SELECT call then check for a non-0 result.

My untested suggestion using mysqli's object-oriented syntax (I did test the SELECT query in PHPMyAdmin):

$query = "SELECT SUM(tally)
          FROM (
              SELECT COUNT(*) AS tally
              FROM pending_media
              WHERE mediaid = ?
              UNION ALL
              SELECT COUNT(*)
              FROM media
              WHERE mediaid = ? OR (date = ? AND uplink = ?)
          ) t";
$conn = new mysqli("localhost", "root","","dbname");
$stmt = $conn->prepare($query);
$stmt->bind_param("ssss", $dielz, $dielz, $date, $nam);
$stmt->execute();
$stmt->bind_result($tally);
$stmt->fetch();
if (!$tally) {
    $stmt->close();
    // insert qualifying data
    $stmt = $conn->prepare("INSERT INTO pending_media VALUES ('',?,?)");
    $stmt->bind_param("ss", $nam, $dielz);
    if ($stmt->execute()) {
        echo "Insert Query Error"; // $stmt->error;
    }else{
        echo "Success";
    }
}