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Variable1 = "SQL-Abfrage";
Variable2 = mysqli_query(Verbindung, Abfrage);
Variable3 = mysqli_num_rows(Variable2)

Beispiel (in der Datenbank kommt das Feld name vor)

$sql2 = "SELECT * FROM ".$tbl.";";
$query2 = mysqli_query($verb, $sql2);
$anzahl = mysqli_num_rows($query2);