How to manipulate php arrays [duplicate] - php

Question

This question already has answers here:
Group rows in an associative array of associative arrays by column value and preserve the original first level keys
(7 answers)
Closed 7 years ago.
How to manipulate php arrays. I have a $data variable below.
$data = Array
(
[0] => Array
(
[id] => 1
[capacity] => 900
[category] => users
)
[1] => Array
(
[id] => 2
[capacity] => 300
[category] => users
)
[2] => Array
(
[id] => 3
[capacity] => 900
[category] => students
)
[3] => Array
(
[id] => 4
[capacity] => 300
[category] => students
)
)
Now I want to group the data with same category like below. . I am not really familiar in php. Can somebody out there help me how to achieve this. What function should I used. Thanks
Array
(
[users] => Array
(
[0] => Array
(
[id] => 1
[capacity] => 900
[category] => users
)
[1] => Array
(
[id] => 2
[capacity] => 300
[category] => users
)
),
[students] => Array
(
[0] => Array
(
[id] => 1
[capacity] => 900
[category] => students
)
[1] => Array
(
[id] => 2
[capacity] => 300
[category] => students
)
)
)

Answer 1

Just iterate over the array and add it depending on the content of the category field to a new array:
$new = array();
foreach ($data as $val) {
$new[$val['category']][] = $val;
}

Answer 2

This does what you requested
<?php
$data = array(
0 => array (
"id" => 1,
"capacity" => 900,
"category" => "users"
),
1 => array (
"id" => 2,
"capacity" => 300,
"category" => "users"
),
2 => array (
"id" => 3,
"capacity" => 900,
"category" => "students"
),
3 => array (
"id" => 4,
"capacity" => 300,
"category" => "students"
)
);
$groups = array();
foreach ($data as $i) {
if ($i['category'] === "students") {
$groups['students'][] = $i;
}
else if ($i['category'] === "users") {
$groups['users'][] = $i;
}
}
echo "<pre>", print_r($groups), "</pre>";
Here is a working demo - http://codepad.viper-7.com/G4Br28