Array sorting based on another index value in php

Question

I have two arrays:

$number=array(1212,340,2310,670,90);            
$cars=array("Volvo","BMW","Toyota","Maruti","Zen");

I need to sort $number array from high to low, which I am doing using rsort. I want to sort $cars based on sorted index value of $numbers and echo it. Like:

$number=array(2310,1212,670,340,90); //sorted values
$cars=array("Toyota","Volvo","Maruti","BMW","Zen") //then display these values

I guess I need to use $order as mentioned in this answer Sort an Array by keys based on another Array? but I am still not able to figure out. I don't want to combine the 2 arrays. I want to sort an array based n index value of other array.

First merge the arrays so that first array becomes the key and second array becomes respective values for the new array, then sort them based on keys — hjpotter92, May 20 '14 at 12:25
There is no direct correlation between those two arrays, and therefore there is no way for you to establish a relationship between the two arrays unless you start using indices. Basically what @hjpotter92 said. — Ohgodwhy, May 20 '14 at 12:25

score 0 · Accepted Answer · answered May 20 '14 at 12:27

0

A simple multisort should to it:

$number=array(1212,340,2310,670,90);
$cars=array("Volvo","BMW","Toyota","Maruti","Zen");

array_multisort($number, SORT_DESC, SORT_NUMERIC, $cars);

var_dump($cars);

Output exactly as you want it:

array(5) {
  [0]=>
  string(6) "Toyota"
  [1]=>
  string(5) "Volvo"
  [2]=>
  string(6) "Maruti"
  [3]=>
  string(3) "BMW"
  [4]=>
  string(3) "Zen"
}

answered May 20 '14 at 12:27

Gerald Schneider

17,416
9
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You can output it any way you want. You asked about sorting, that's what multisort is for. `echo implode('
', $cars);` will echo it. – Gerald Schneider May 20 '14 at 12:33
Yes, I know. I just told you what I wanted. :P I can do it on my own – user2567857 May 20 '14 at 12:34

score -1 · Answer 2 · answered May 20 '14 at 12:26

You need array_combine...

Here's an example:

<?php
    $number=array(1212,340,2310,670,90);            
    $cars=array("Volvo","BMW","Toyota","Maruti","Zen");
    $newarray = array_combine($number, $cars);

    print_r($newarray);
?>

results in:

Array ( [1212] => Volvo [340] => BMW [2310] => Toyota [670] => Maruti [90] => Zen )

http://www.php.net/manual/en/function.array-combine.php

score -1 · Answer 3 · answered May 20 '14 at 12:27

-1

Use a multidimensional array and then Sort it:

<?php        
$cars=array(1212=>"Volvo",340=>"BMW",2310=>"Toyota",670=>"Maruti",90=>"Zen");
krsort($cars);
foreach ($cars as $key => $val) {
echo "$key = $val\n";
}

answered May 20 '14 at 12:27

Kakitori

901
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Array sorting based on another index value in php

3 Answers3