Sort array of strings based on priority substring at the end of the string

Question

How can I order an array from this:

$unordered_array = ['11196311|3','17699636|13','11196111|0','156875|2','17699679|6','11196237|7','3464760|10'];

To this

$ordered_array = ['11196111', '156875', '11196311', '17699679','11196237','3464760', '17699636'];

The number after the "|" defines the position, and the array needs to be ordered from lower to higher, and remove the position number in the final array.

Use usort(). The comparison function extracts the number after | and compares them. — Barmar
– Barmar, Commented Nov 17, 2017 at 21:03
You can remove the position number after you sort the array, using array_map. — Barmar
– Barmar, Commented Nov 17, 2017 at 21:03
Welcome to Stack Overflow! StackOverflow expects you to try to solve your own problem first, and we also don't answer homework questions. Please update your question to show what you have already tried in a minimal, complete, and verifiable example. For further information, please see how to ask good questions, and take the tour of the site :) — Barmar
– Barmar, Commented Nov 17, 2017 at 21:03

mickmackusa · Accepted Answer · 2023-10-09 03:59:27Z

2

$array = array();
foreach($unordered_array as $value) {
    $value = explode('|', $value);
    $array [$value[1]]= $value[0];    
}
ksort($array);
$ordered_array = array_values($array);

var_dump($ordered_array);

edited Oct 9, 2023 at 3:59

mickmackusa♦

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answered Nov 17, 2017 at 21:04

Vincent Decaux

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Comments

mickmackusa · Accepted Answer · 2023-10-09 04:11:59Z

1

Split the values into two arrays containing the ids and the ordering priorities, then sort the ids array using the priorities array. The following approach will even work when the same priority number is assigned to more than one id.

Code: (Demo)

$unordered_array = ['11196311|3','17699636|13','11196111|0','156875|2','17699679|6','11196237|7','3464760|10'];

$ids = [];
$priorities = [];
foreach ($unordered_array as $v) {
    [$ids[], $priorities[]] = explode('|', $v);
}
array_multisort($priorities, SORT_NUMERIC, $ids);
var_export($ids);

answered Oct 9, 2023 at 4:11

mickmackusa♦

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