How to properly fix - Cannot use empty array elements in arrays

Question

I have the code below but it showing an error "Cannot use empty array elements in arrays".

It seems that the issue is in this line }), collect(json_decode($post['comments'], true))->map(function ($comment) {

Code:

'data' => [
    'comments' =>
    collect(json_decode($configs['comments'], true))->map(function ($comment) {
        return [
            'title' => $comment['attributes']['title'],
            'message' => $comment['attributes']['message'],
        ];
    }),  collect(json_decode($posts['comments'], true))->map(function ($comment) {
        return [
            'title' => $comment['attributes']['title'],
            'message' => $comment['attributes']['message'],
        ];
    }),
]

It has this format "^ "[{"key": "o0Gdz1EsxOpOLN", "layout": "comment", "attributes": {"title": "a", "comment": "b"}}]" ". — Bernard
– Bernard, Commented May 6, 2022 at 11:01
@Bernard if that is the case, both maps attempt to get the message property from the attributes object. In the data you provided, that object uses the property key comment, not message. — msmahon
– msmahon, Commented May 6, 2022 at 13:23
Would be good if OP could add the json string to the question. — William Patton
– William Patton, Commented May 7, 2022 at 12:55

xuma · Accepted Answer · 2022-05-06 20:52:35Z

1

If we simplify your code it seems like this;

'data' => [
    'comments' =>
       collect(),  
       collect()
]

It is not a valid syntax. You can try like this;

$comments = collect(json_decode($configs['comments'], true))->map(function ($comment) {
    return [
        'title' => $comment['attributes']['title'],
        'message' => $comment['attributes']['message'],
    ];
});
$postComments =  collect(json_decode($posts['comments'], true))->map(function ($comment) {
    return [
        'title' => $comment['attributes']['title'],
        'message' => $comment['attributes']['message'],
    ];
});

'data' => [
    'comments' => $comments->merge($postComments)->toArray()
];

answered May 6, 2022 at 20:52

xuma

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