Sorting array in PHP based on another array indexes - php

Question

I have two arrays
// array of objects
$records = array(
[0] => (object) [
'id' => 1, // (*)
....
],
[1] => (object) [
'id' => 2, // (*)
....
],
[2] => (object) [
'id' => 3, // (*)
....
],
);
// array 2
// the keys in this array refer to the object ids (*)
$sorted = array(
'2' => 7,
'3' => 4,
'1' => 2,
);
$new_records = array();
What I want to do is to sort the values of first array (i.e the objects) based on the order of the key index of the second array, so the end result in this case will become:
$new_records = array(
[0] => (object) [
'id' => 2,
....
],
[1] => (object) [
'id' => 3,
....
],
[2] => (object) [
'id' => 1,
....
],
);
$records = $new_records;

Answer 1

Try this
$new_records = array();
foreach( $sort as $id => $pos ) {
foreach( $records as $record ) {
if( $record[ 'id' ] == $id ) {
$new_records[] = $record;
break;
}
}
}

Answer 2

This make the job
$records = array(
0 => (object) [
'id' => 1, // (*)
],
1 => (object) [
'id' => 2, // (*)
],
2 => (object) [
'id' => 3, // (*)
],
);
// array 2
// the keys in this array refer to the object ids (*)
$sorted = array(
'2' => 7,
'3' => 4,
'1' => 2,
);
$keySorted = array_keys($sorted);
usort($records, function ($a, $b) use ($keySorted) {
$pos_a = array_search($a->id, $keySorted);
$pos_b = array_search($b->id, $keySorted);
return $pos_a - $pos_b;
});
var_dump($records);

Answer 3

Here, I have created sorting of array and add to your array of object using current() and key() is from php.
$i = 0;
while ($value = current($sorted)) {
$key = key($sorted); // get key from array 2
$records[i]->array('id' => $key); // set key to array of object
next($array);
$i++;
}
I hope this may help you.

Answer 4

Code: (Demo)
$records = [(object)['id' => 1], (object)['id' => 2], (object)['id' => 3]];
$sorted = ['2' => 7, '3' => 4, '1' => 2];
$tempArr = array();
foreach ($records as $value) {
$tempArr[$value->id] = $value;
}
$resultArr = array_values(array_replace($sorted, $tempArr));
var_export($resultArr);
Output:
array (
0 =>
stdClass::__set_state(array(
'id' => 2,
)),
1 =>
stdClass::__set_state(array(
'id' => 3,
)),
2 =>
stdClass::__set_state(array(
'id' => 1,
)),
)