encode() with output

Hard to understand (json_encode) i'm using the code:

<?php

    $query = mysql_query("SELECT * FROM messages ORDER BY ID");
    while($fetch = mysql_fetch_assoc($query))
    {
    $titel = $fetch[title];
    $post = array('items' => array( 0 => array('title' => "$title", 'description' => "$title")));


    echo json_encode($post);

}
?>

Output:

  {"items":[{"title":"title","description":"title"}]}
{"items":[{"title":"title","description":"title"}]}

But i want an output like:

{

"items": [

{
"title":"title",
"description":"title"
},
{
"title":"title",
"description":"title"
},
{
"title":"title",
"description":"title"
}

]

}

Can someone please help me to get an output like the code above?

---

Try this instead:

<?php

$query = mysql_query("SELECT * FROM messages ORDER BY ID");
$post = array();
while($fetch = mysql_fetch_assoc($query))
{
    $titel = $fetch[title];
    $post['items'][] = array('title' => "$title", 'description' => "$title");
}
echo json_encode($post);
?>

Edit: correction

---

在循环之前将项目创建为数组，在循环内部追加，然后将其放入$ post并在循环之后进行编码。

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