Re-structuring a multidimensional array for conditional variables - php

Question

I'm currently dumping this array:
0 => {#407 ▼
+"item_id": "11873"
+"type": "Item Title"
+"comment": "Item Title"
+"typet_id": "2"
}
1 => {#408 ▼
+"item_id": "11873"
+"type": "Item Instruction"
+"comment": "test instruction"
+"typet_id": "2"
}
2 => {#409 ▼
+"item_id": "11875"
+"type": "Item Title"
+"comment": "Test Title"
+"typet_id": "2"
}
3 => {#410 ▼
+"item_id": "11874"
+"type": "Item Title"
+"comment": "Item Title"
+"typet_id": "2"
}
4 => {#411 ▼
+"item_id": "11874"
+"type": "Item Instruction"
+"comment": "test instruction"
+"typet_id": "2"
}
and it does show all of the correct data, but I'm trying to figure out how to set up a foreach loop with the structure I need.
As you can see, two of the items above have the same item_id because they each have different 'type' values. So each Item can have a Item title and a Item instruction, and I'm just getting multiple results for each Item.
I'm trying to get a structure where they are grouped by item_id and then I can have both 'type' values
0 => {#407 ▼
+"item_id": "11873"
2=> {
type: "Item Title"
comment: "Item Title"
},
{
type:"Item Instruction"
comment: "Test Instruction"
}
typet_id:"2"
}
1 => {#408 ▼
+"item_id": "11874"
2=> {
type: "Item Title"
comment: "Item Title"
},
{
type:"Item Instruction"
comment: "Test Instruction"
}
typet_id:"2"
}
2 => {#409 ▼
+"item_id": "11875"
2=> {
type: "Item Title"
comment: "Item Title"
}
typet_id:"2"
}
I know I can set the first foreach around the id, but I'm unclear how to structure the rest to get the correct output I'm looking for so that I can differentiate between the type and comment. Basically if type is Title, I need to set it to one variable and if type is Instruction I need to set it to a different value because they will go in different columns of an html table.
foreach($getItem as $id => $components){
$id = $components->item_id;
}