php check if record already exists

<?php

mysql_connect('localhost', 'admin', 'abc456');

mysql_select_db('web');

if (mysqli_connect_errno())

  {

  echo "Failed to connect to MySQL: " . mysqli_connect_error();

  }

?>

<?php

$suid = $_SESSION['userid'];

$check = mysql_query("SELECT id FROM arts WHERE id = '$suid'");

$chid = mysql_fetch_array( $check );

if ($chid == true)

   {

  header('Location: userprofile.php');

   }

  else {

 header('Location: edit-profile.php');

       }

?>

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