array_values() expects parameter 1 to be array, null given

Question

Whats wrong in the array_values() function.

I tried assigning the $updated_f to array().

I get Warning: array_values() expects parameter 1 to be array, null given

$this_params = array_merge_recursive($params, array('f' => array($filter['prefix'] => array($item['id'])))); 

if (isset($this_params['f'])) {
    $updated_f = array(); 
   //Updated code
    if(isset($this_params['f']) && is_array($this_params['f']) && count($this_params['f']) >0)
    {
      foreach($this_params['f'] as $f_key => $assoc_array) {
         $updated_f[$f_key] = array_values($assoc_array);   //Warning here
       } 
    }
    $this_params['f'] = $updated_f;
  }

Pretty obvious isn't it? On at least one of the loops, $assoc_array is not an array, it is null. Print out $this_params['f'] and you'll see it... — Devon Bessemer
– Devon Bessemer, Commented Sep 15, 2016 at 5:58
check var_dump($this_params['f']); OR echo "<pre/>";print_r($this_params['f']); and check is it printing an array or not? to prevent yourself from error you need to add:- if (isset($this_params['f']) && is_array($this_params['f']) && count($this_params['f']) >0) { — Death-is-the-real-truth
– Death-is-the-real-truth, Commented Sep 15, 2016 at 6:00
Yes i printed out : echo '<pre>';print_r($this_params['f']); and i get : Array ( [r_103] => Array ( [0] => 62 ) ) — Sushivam
– Sushivam, Commented Sep 15, 2016 at 6:05
I have added the condition @Anant, im still getting the same error — Sushivam
– Sushivam, Commented Sep 15, 2016 at 6:11

Haresh Vidja · Accepted Answer · 2016-09-15 06:14:58Z

12

array_values() function accept only array type variable Below line

 $updated_f[$f_key] = array_values($assoc_array);   //Warning here

Replace line with

$updated_f[$f_key] = is_array($assoc_array)? array_values($assoc_array): array();

answered Sep 15, 2016 at 6:14

Haresh Vidja

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