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json_encode fails with special characters

Last Modified: 2015-04-03
I've got the following piece of code:

		$query = "SELECT * 
				  FROM user
				  ORDER BY userFullName ASC";
		$result = mysqli_query($con, $query);
		$rows = array();
		while ($r = mysqli_fetch_assoc($result)) {
			$rows[] = $r;
		header('Content-Type: application/json');
        echo json_encode($rows);

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One of the users has a special character on his name ( é ) and when that's in there - the json_encode fails. How can one go around this and get a good output anyway?
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