PHP foreach嵌套循环不接受数组的一部分

Question

When I try to extract the user id from my array I get the error:

[31-May-2016 21:10:00 America/New_York] PHP Warning: Invalid argument supplied for foreach() in filename.php line 24

Here is the code:

$users = $lists->users;
foreach($users as $user) 
{
    $true_id = $user->id;
    foreach ($true_id as $i => $id) 
    {
        if (empty($friends->ids) or !in_array($id, $friends->ids)) 
        {
            $ret = $toa->post('friendships/create', array('user_id' => $id));
        }
    }
}

Answer 1

you need to assign the objects as arrays.

$users = (array) $lists->users;
foreach ($users as $user) {
    $true_id = (array) $user->id;
    foreach ($true_id as $i => $id) {
        if (empty($friends->ids) || in_array($id, $friends->ids) === false) {
            $ret = $toa->post('friendships/create', array('user_id' => $id));
        }
    }
}

Answer 2

You are trying to iterate on $user->id , however, this does not seem to be an iterable object.

Just access the scalar field id without any nested loop:

$users = (array) $lists->users;
foreach ($users as $user) {
    if (empty($friends->ids) || in_array($user->id, $friends->ids) === false) {
        $ret = $toa->post('friendships/create', array('user_id' => $user->id));
    }
}