Question

I have the following array named $ingredient_difference in PHP (example output below):

Array (
  [total_remaining_ingredients] => Array (
    [0] => 2 [1] => 3 [2] => 10
  )
  [idrecipe] => Array (
    [0] => 8 [1] => 10 [2] => 9
  )
  [value] => Array ( [0] => 1 [1] => 1 [2] => 1 )
) 

I’m trying to extract at least the values of idrecipe using ‘foreach’, but I’m getting undefined index with the following code:

foreach($ingredient_difference as $recipe_output)
{
    echo $recipe_output['idrecipe']."<br />";
}

I know the above isn’t exactly the way to do it, but this also was not working (undefined index error for ‘idrecipe’, ‘value’ and ‘total_remaining_ingredients’):

foreach($ingredient_difference as $c => $rowkey)
{
    $sorted_idrecipe[] = $rowkey['idrecipe'];
    $sorted_value[] = $rowkey['value'];
    $sorted_remaining_ingredients[] = $rowkey['total_remaining_ingredients']; 
}

What am I missing in my foreach syntax? Or is there a better way?

This foreach construct is also giving undefined index errors:

foreach($ingredient_difference as $rowkey => $index_value)
{
    $id_value[$key] = $index_value['idrecipe'];
    $value_value[$key] = $index_value['value'];
    $tri_value[$key] = $index_value['total_remaining_ingredients'];
}

Answer thanks to ComFreek:

$result_ingredient_difference = array();
$count_id = count($ingredient_difference['idrecipe']);

for ($i=0; $i<$count_id; $i++)
{
  $result_ingredient_difference[] = array(
  'tri' => $ingredient_difference['total_remaining_ingredients'][$i],
  'idrecipe' => $ingredient_difference['idrecipe'][$i],
  'value' => $ingredient_difference['value'][$i]
  );
}
//rearranged array of $result_ingredient_difference able to call proper indexing with the below
foreach($result_ingredient_difference as $rowkey => $index_value) 
{ 
  $id_value[$key] = $index_value['idrecipe']; 
  $value_value[$key] = $index_value['value']; 
  $tri_value[$key] = $index_value['tri'];
} 

Answer 1

With your first foreach() loop, you iterate over the main array and not over the values of the subarray idrecipe!

foreach($ingredient_difference['idrecipe'] as $value)
{
  echo $value;
}