<?php
$array = [
"2022-10-30" => ['▶'],
"2022-10-31" => ['▶'],
"2022-11-09" => ['▶'],
"2022-11-07" => ['▶']
];
$result = [];
foreach ($array as $key => $value) {
$ym = substr($key, 0, 7);
if (!isset($lookup[$ym])) {
$result[$key] = $value;
$lookup[$ym] = $key;
} elseif ($lookup[$ym] < $key) {
unset($result[$lookup[$ym]]);
$result[$key] = $value;
$lookup[$ym] = $key;
}
}
var_export($result);
- Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
- array (
'2022-10-31' =>
array (
0 => '▶',
),
'2022-11-09' =>
array (
0 => '▶',
),
)
preferences:
122.24 ms | 402 KiB | 121 Q