PHP get keys in nested array using array_keys( )

Question

I have a $results array produced from a query and I would like to output a table in html. I would like the header to be "id", "length" and "sample_id". Since the header changes every time, so I used

$keys = array_keys($results[0]);

I got "array_keys() expects parameter 1 to be array" error. If the nested part is not an array, how should I get the keys?

array:59 [▼
  0 => {#160 ▼
    +"id": 204
    +"length": 233
    +"sample_id": "ad3"
  }
  1 => {#161 ▼
    +"id": 205
    +"length": 733.5
    +"sample_id": "bt7r"
  }
  2 => {#162 ▶}
  3 => {#163 ▶}
  4 => {#164 ▶}
  5 => {#165 ▶}

change whatever datatype that is to array->get array key-> done?? — Andrew
– Andrew, Commented Oct 28, 2015 at 15:50

hannesvdvreken · Accepted Answer · 2015-10-28 15:50:41Z

2

This is because $results is actually an array of objects.

I don't know how you got the array, but one can usually choose how to return the objects.

If you're using PDO, one can use the method $statement->fetchAll();.

One can also get all the "keys" by using the get_object_vars method to get them:

$keys = array_keys(get_object_vars($results[0]));

answered Oct 28, 2015 at 15:50

hannesvdvreken

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1 Comment

Daolin Over a year ago

I used Laravel Query Builder. The array was generated by : $query->get();

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