Separate Array objects on key bases - PHP - php

Question

I have an Array containing sub-sets of data as following:
"options":[
{
"id":"13",
"option_name":"M",
"option_id":"1",
"label":"Size"
},
{
"id":"13",
"option_name":"L",
"option_id":"1",
"label":"Size"
},
{
"id":"13",
"option_name":"BLUE",
"option_id":"1",
"label":"Color"
},
{
"id":"13",
"option_name":"GREEN",
"option_id":"1",
"label":"Color"
}
]
I want to loop into this array and separate objects/subsets based on key label. As following:
"options":[
{
"label":"Size",
"optionsArray":[
{
"id":"11",
"option_name":"XL",
"option_id":"1",
"label":"Size",
},
{
"id":"12",
"option_name":"L",
"option_id":"1",
"label":"Size",
}
]
},
{
"label":"Color",
"optionsArray":[
{
"id":"11",
"option_name":"BLUE",
"option_id":"1",
"label":"Color",
},
{
"id":"12",
"option_name":"GREEN",
"option_id":"1",
"label":"Color",
}
]
}
]
How can i achieve this with PHP?
As this post is already full of code, stackoverflow wouldn't let me paste my current try of code, so i will try to paste simple structure as plain text.
$keys = array_keys(current($options));
$len = count($options);
foreach($keys as $key){
// Access the key first
for($i=0;$i<$len; $i++){
// access the row later
echo $array[$i][$key];
}
}

Answer 1

I'd do it like that:
$result = [];
foreach ($options as $option) {
if (!isset($result[$option['label']])) {
$result[$option['label']] = [
'label' => $option['label'],
'optionsArray' => []
];
}
$result[$option['label']]['optionsArray'][] = $option;
}
$result = array_values($result);

Answer 2

<?php
// Decode the JSON (true for using associative arrays)
$array = json_decode($json, true);
// Initialize three arrays
$colors = [];
$sizes = [];
$unknown = [];
// Loop and seperate them using a switch
foreach ($array['options'] as $o) {
if (! isset($o['label'])) {
trigger_error('label not in object', E_USER_WARNING);
}
switch($o['label']) {
case 'Size':
$sizes[] = $o;
break;
case 'Color':
$colors[] = $o;
break;
// Put all malformed objects into this array
default:
$unknown[] = $o;
}
}
// You can now easily build your new array
$output = ['options' => [
['label' => 'Size', 'optionsArray' => $sizes],
['label' => 'Color', 'optionsArray' => $colors]
]];