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私を助けてください。Undefined index:timestamp in line 24 のようなエラーに直面しています。:(どんな助けでも大歓迎です!事前に感謝します

$mysql_connect = mysql_connect($db_host, $db_user, $db_pword, $db_name);
$query = "SELECT DATE_FORMAT(`timestamp`,'%d-%m-%Y') from statistics";
if (!$mysql_connect)
die("unable to connect to database: " . mysql_error());

@mysql_select_db($db_name) or die( "Unable to select database");

$result = mysql_query($query);
$response = array();
$stats = array();
while ($row=mysql_fetch_array($result))
{ 
$stats[] = array (
    'date' => $row ['timestamp']
); 
} 

$Response['stats'] = $stats;

$fp = fopen('results.json', 'w');
fwrite($fp, json_encode($Response));
fclose($fp);

die ("Failed to execute Query: " . mysql_error());

mysql_close($mysql_connect);

/*$views = mysql_fetch_array($result);
print("<pre>");
print_r($views);
print("</pre>");*/

?>
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