PHP Sort Multidimensional array with key value

<?php
$needSort = array(
    array("name" => "Bob", "age" => 8, "colour" => "red"),
    array("name" => "Greg", "age" => 12, "colour" => "blue"),
    array("name" => "Andy", "age" => 5, "colour" => "purple")
);
echo "<h3>Original Array</h3><pre>";
print_r($needSort);
echo "</pre>";

$orderBy = "name";
$sortArray = array();
$sortArray[$orderBy] = array();

foreach ($needSort as $obj) {
    $sortArray[$orderBy][] = $obj[$orderBy]; //Sort by name
}

array_multisort($sortArray[$orderBy], SORT_ASC, $needSort);

echo "<h3>Sorted Array</h3><pre>";
print_r($needSort);
echo "</pre>";
?>

Output

Original Array

Array
(
    [0] => Array
        (
            [name] => Bob
            [age] => 8
            [colour] => red
        )

    [1] => Array
        (
            [name] => Greg
            [age] => 12
            [colour] => blue
        )

    [2] => Array
        (
            [name] => Andy
            [age] => 5
            [colour] => purple
        )

)


Sorted Array

Array
(
    [0] => Array
        (
            [name] => Andy
            [age] => 5
            [colour] => purple
        )

    [1] => Array
        (
            [name] => Bob
            [age] => 8
            [colour] => red
        )

    [2] => Array
        (
            [name] => Greg
            [age] => 12
            [colour] => blue
        )

)

Sort an ArrayList base on multiple attributes using java/grails

I have an ArrayList of object. The object contain attributes name and classValue. So I want to sort the objects on the classValue, and for all objects in the same classValue I want to sort them on name.

---

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;

/**
 *
 * @author Pritom Kumar
 */
public class MapSort {
    public static void main(String[] args) {
        MapSort mapSort = new MapSort();
        mapSort.sort();
    }
    
    public void sort() {
        List keys = new ArrayList();
        HashMap map1 = new HashMap();
        map1.put("name", "Pritom");
        map1.put("classValue", 5);
        keys.add(map1);
        
        HashMap map2 = new HashMap();
        map2.put("name", "Bappi Lahiri");
        map2.put("classValue", 10);
        keys.add(map2);
        
        HashMap map3 = new HashMap();
        map3.put("name", "Ashok Kumar");
        map3.put("classValue", 5);
        keys.add(map3);

        Collections.sort(keys,
            new Comparator() {
                public int compare(Object left, Object right) {
                    HashMap leftMap = (HashMap) left;
                    HashMap rightMap = (HashMap) right;
                    Integer classValue1 = Integer.parseInt(leftMap.get("classValue").toString());
                    Integer classValue2 = Integer.parseInt(rightMap.get("classValue").toString());
                    int comp = classValue1.compareTo(classValue2);
                    return comp == 0 ? leftMap.get("name").toString().compareTo(rightMap.get("name").toString()) : comp;
                }
            });

        //List the values
        Object[] keyList = keys.toArray();
        for(Integer index = 0; index < keyList.length; index++) {
            System.out.println(keyList[index]);
        }
    }
}

And the output is as following. At first sorts by classValue and then by name.

{name=Ashok Kumar, classValue=5}
{name=Pritom, classValue=5}
{name=Bappi Lahiri, classValue=10}

Sorting with Set::sort() in CakePHP 1.2

Sorting data returned from a database query

You're probably thinking "Err... idiot... just use the ORDER BY functionality in the model!". Yeah, we could do that, but that's not much fun!
Here is my freshly baked People controller, which gracefully passes some data to my view. Nothing special here.

<?php
class PeopleController extends AppController {

    var $name = 'People';
    
    function index() {
        $this->set('people', $this->Person->find('all'));
    }
    
}
?>
 

The $people array is in the standard format we receive from our model, and has a belongsTo association (Occupation).

Array
(
    [0] => Array
        (
            [Person] => Array
                (
                    [id] => 1
                    [occupation_id] => 2
                    [name] => Harry Potter
                    [birth_date] => 1980-07-31
                )

            [Occupation] => Array
                (
                    [id] => 2
                    [name] => Student
                )

        )

    [1] => Array
        (
            [Person] => Array
                (
                    [id] => 2
                    [occupation_id] => 1
                    [name] => Albus Dumbledore
                    [birth_date] => 1881-08-01
                )

            [Occupation] => Array
                (
                    [id] => 1
                    [name] => Headmaster
                )

        )

    [2] => Array
        (
            [Person] => Array
                (
                    [id] => 3
                    [occupation_id] => 3
                    [name] => Severus Snape
                    [birth_date] => 1959-01-09
                )

            [Occupation] => Array
                (
                    [id] => 3
                    [name] => Professor
                )

        )

)

Default order

Instead of dumping the entire contents of the $people array after each Set::sort() call, I will present the data in a pretty table.

Person.id	Person.name	Person.birth_date	Occupation.id	Occupation.name
1	Harry Potter	1980-07-31	2	Student
2	Albus Dumbledore	1881-08-01	1	Headmaster
3	Severus Snape	1959-01-09	3	Professor

Person.birth_date DESC

Set::sort() currently takes 3 arguments - the array to sort, the array value to sort on, and the sort order. As with the other Set methods, we specify the value to sort on using a key path. This makes it super easy to deal with complex arrays.

$people = Set::sort($people, '{n}.Person.birth_date', 'desc');
 

Person.id	Person.name	Person.birth_date	Occupation.id	Occupation.name
1	Harry Potter	1980-07-31	2	Student
3	Severus Snape	1959-01-09	3	Professor
2	Albus Dumbledore	1881-08-01	1	Headmaster

Occupation.name ASC

It's just as simple sorting on a value of an associated model, in this case the person's occupation. Unfortunately the sort method doesn't current have a default sort order, so we need to specify this. We can also use the PHP constants, SORT_ASC and SORT_DESC.

$people = Set::sort($people, '{n}.Occupation.name', SORT_ASC);
 

Person.id	Person.name	Person.birth_date	Occupation.id	Occupation.name
2	Albus Dumbledore	1881-08-01	1	Headmaster
3	Severus Snape	1959-01-09	3	Professor
1	Harry Potter	1980-07-31	2	Student

 http://blogs.bigfish.tv/adam/2008/03/24/sorting-with-setsort-in-cakephp-12/