php mysql update all rows in table random values

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1$idresult = $conn->query("SELECT id FROM pictures");
2
3while ($row = $idresult->fetch_assoc()){
4   mysqli_query($conn, "UPDATE pictures SET UniqueKey = '$UniqueKey' WHERE id = " . $row['id'];
5}

1$idresult = $conn->query("SELECT id FROM pictures");
2
3while ($row = $idresult->fetch_assoc()){
4   mysqli_query($conn, "UPDATE pictures SET UniqueKey = '$UniqueKey' WHERE id = " . $row['id']);
5}

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