• The issue at hand is the removal of elements from one array based on another array.

» Input:

$obj1 = [["instruction_id" => 133]];
$obj2 = [["instruction_id" => 131], ["instruction_id" => 132], ["instruction_id" => 133]];

» Using array_map and array_filter:

$obj1 = [["instruction_id" => 133]];
$obj2 = [["instruction_id" => 131], ["instruction_id" => 132], ["instruction_id" => 133]];
$instruction_ids_to_remove = array_map(function($item) {
    return $item["instruction_id"];
}, $obj1);
$obj2 = array_filter($obj2, function($item) use ($instruction_ids_to_remove) {
    return !in_array($item["instruction_id"], $instruction_ids_to_remove);
});
$obj2 = array_values($obj2);

Note:

[["instruction_id" => 133]] -> JSON String -> json_decode() to convert to array.
array (
  0 => 
  array (
    'instruction_id' => 131,
  ),
  1 => 
  array (
    'instruction_id' => 132,
  ),
) -> PHP Array -> json_encode() to convert to string.