Php check if query succeeded

<?php
	// peform a query 
      $query = "SELECT `*` FROM user";
      $results = mysqli_query($databaseConnection, $query);

      if (mysqli_num_rows($results) == 0) {
        // The query returned 0 rows!
      } else {
        // the query returned ATLEAST one row
      }

      if (mysqli_num_rows($results) >= 5) {
        // the query returned more than 5 rows
        }
?>

Source: php.net

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