<?php
$arr = array
(
"100" => array(
array(
"country" => 'France',
"city" => 'Paris',
"population" => '1800000',
),
array(
"country" => 'France',
"city" => 'Paris',
"population" => '2000000',
),
array(
"country" => 'France',
"city" => 'Toulouse',
"population" => '500000',
),
),
"101" => array(
array(
"country" => 'Russia',
"population" => '144000000',
)
)
);
foreach($arr as $key => $sub){
foreach($sub as $item){
if(isset($item['city'])){
if(!isset($res[$key][$item['country'] . $item['city']])) $res[$key][$item['country'] . $item['city']] = $item;
if($res[$key][$item['country'] . $item['city']] < $item['population']) $res[$key][$item['country'] . $item['city']] = $item;
}else{
if(!isset($res[$key][$item['country']])) $res[$key][$item['country']] = $item;
if($res[$key][$item['country']] < $item['population']) $res[$key][$item['country']] = $item;
}
}
}
var_dump($res);
- Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
- array(2) {
[100]=>
array(2) {
["FranceParis"]=>
array(3) {
["country"]=>
string(6) "France"
["city"]=>
string(5) "Paris"
["population"]=>
string(7) "1800000"
}
["FranceToulouse"]=>
array(3) {
["country"]=>
string(6) "France"
["city"]=>
string(8) "Toulouse"
["population"]=>
string(6) "500000"
}
}
[101]=>
array(1) {
["Russia"]=>
array(2) {
["country"]=>
string(6) "Russia"
["population"]=>
string(9) "144000000"
}
}
}
preferences:
181.37 ms | 404 KiB | 213 Q