数据已插入两次

Question

我正试图在mysql中插入一个关联数组，数据已插入，但插入了两次。

这是我的数组$newarr，

array ([apple]=> red,[orange] => orange,[banana] => yellow)

这是我的代码：

<?php    

include 'connection.php' ;

$url = "http://admin.contenta.com/api";

$jsondata = file_get_contents($url);

$response = json_decode($jsondata, true);

$myarray = $response['links'] ;

foreach ($myarray as $k => $v) {
$newarr[$k] = $v['href']; 
}

$res = $db->prepare("INSERT INTO apidata (item, value) VALUES (?,?)") ;

foreach ($newarr as $item => $val) {
    $res->execute( [ $item, $val ] );
}

echo "<pre>";  print_r( $newarr, 0 ); echo "</pre>"; // here are the 3 
itemss returned