Group Array by category - php

Question

I am facing problem In grouping array with the Key:-
I have an php array Which has following elecment in it.
$array = array(
'0' => array ( 'id' => 'food,Travel', 'names' => 'chimpanzee' ),
'1' => array ( 'id' => 'food', 'name' => 'meeting' ),
'2' => array ( 'id' => 'Z1', 'name' => 'dynasty' ),
'3' => array ( 'id' => 'X', 'name' => 'chocolate' ),
'4' => array ( 'id' => 'Travel', 'name' => 'bananas' ),
'5' => array ( 'id' => 'Travel', 'name' => 'fantasy' ),
'6' => array ( 'id' => 'Travel', 'name' => 'football' )
);
When I try with following code:-
$newarray= array();
foreach($array as $key => $value){
$newarray[$value['id']][$key] = $value;
}
I am getting below result Array Here food,travel is created another array but I want to please those to respective category "Food goes to food" and travel goes to travel"
(
[food,Travel] => Array
(
[0] => Array
(
[id] => food,Travel
[names] => chimpanzee
)
)
[food] => Array
(
[1] => Array
[id] => food,Travel
[names] => chimpanzee
)
(
[id] => food
[name] => meeting
)
)
[Z1] => Array
(
[2] => Array
(
[id] => Z1
[name] => dynasty
)
)
[X] => Array
(
[3] => Array
(
[id] => X
[name] => chocolate
)
)
[Travel] => Array
(
[4] => Array
(
[id] => Travel
[name] => bananas
)
[5] => Array
(
[id] => Travel
[name] => fantasy
)
[6] => Array
(
[id] => Travel
[name] => football
)
)
)
But I am want following result:- Food should Go to food category and travels should go to travels category like:-
Array
(
[food] => Array
(
// Food should come at food category
[0] => Array
(
[id] => food
[names] => chimpanzee
)
)
(
[1] => Array
(
[id] => food
[name] => meeting
)
)
[Z1] => Array
(
[2] => Array
(
[id] => Z1
[name] => dynasty
)
)
[X] => Array
(
[3] => Array
(
[id] => X
[name] => chocolate
)
)
[Travel] => Array
(
( // Travel should come at travel category
[0] => Array
(
[id] => food
[names] => chimpanzee
)
)
[4] => Array
(
[id] => Travel
[name] => bananas
)
[5] => Array
(
[id] => Travel
[name] => fantasy
)
[6] => Array
(
[id] => Travel
[name] => football
)
)
)

Answer 1

When id has ,, just explode it, check the demo
$result = [];
foreach($array as $k => $v){
if(strpos($v["id"],",")) {
$ids = explode(",", $v["id"]);
foreach ($ids as $id) {
$result[$id][$k] = $v;
}
}else{
$result[$v["id"]][$k] = $v;
}
}
var_dump($result);

Answer 2

No need to make it complex, like some have suggested, use explode()
https://3v4l.org/jVK6j
$newarray= [];
foreach($array as $key => $value) {
if(is_array(explode(",", $value["id"]))) {
foreach(explode(",", $value["id"]) as $category) {
$newarray[$category][$key] = $value;
$newarray[$category][$key]["id"] = $category;
}
} else {
$newarray[$value["id"]][$key] = $value;
}
}
var_dump($newarray);
You could even remove $key since these will be auto incremented.
foreach($array as $value) {
if(is_array(explode(",", $value["id"]))) {
foreach(explode(",", $value["id"]) as $category) {
$value["id"] = $category;
$newarray[$category][] = $value;
}
} else {
$newarray[$value["id"]][] = $value;
}
}